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code / linux / torvalds / linux / 9b3a713feef8db41d4bcccb3b97e86ee906690c8 / . / drivers / gpu / drm / i915 / display / intel_dp.c
blob: 9b15ac4f2fb6e00a259b162dc273cc57a3495160 [file] [log] [blame]
/*
* Copyright © 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Keith Packard <keithp@keithp.com>
*
*/
#include <linux/export.h>
#include <linux/i2c.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_hdcp.h>
#include <drm/drm_probe_helper.h>
#include <drm/i915_drm.h>
#include "i915_debugfs.h"
#include "i915_drv.h"
#include "i915_trace.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_connector.h"
#include "intel_ddi.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_dp_link_training.h"
#include "intel_dp_mst.h"
#include "intel_dpio_phy.h"
#include "intel_fifo_underrun.h"
#include "intel_hdcp.h"
#include "intel_hdmi.h"
#include "intel_hotplug.h"
#include "intel_lspcon.h"
#include "intel_lvds.h"
#include "intel_panel.h"
#include "intel_psr.h"
#include "intel_sideband.h"
#include "intel_tc.h"
#include "intel_vdsc.h"
#define DP_DPRX_ESI_LEN 14
/* DP DSC small joiner has 2 FIFOs each of 640 x 6 bytes */
#define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER 61440
#define DP_DSC_MIN_SUPPORTED_BPC 8
#define DP_DSC_MAX_SUPPORTED_BPC 10
/* DP DSC throughput values used for slice count calculations KPixels/s */
#define DP_DSC_PEAK_PIXEL_RATE 2720000
#define DP_DSC_MAX_ENC_THROUGHPUT_0 340000
#define DP_DSC_MAX_ENC_THROUGHPUT_1 400000
/* DP DSC FEC Overhead factor = 1/(0.972261) */
#define DP_DSC_FEC_OVERHEAD_FACTOR 972261
/* Compliance test status bits */
#define INTEL_DP_RESOLUTION_SHIFT_MASK 0
#define INTEL_DP_RESOLUTION_PREFERRED (1 << INTEL_DP_RESOLUTION_SHIFT_MASK)
#define INTEL_DP_RESOLUTION_STANDARD (2 << INTEL_DP_RESOLUTION_SHIFT_MASK)
#define INTEL_DP_RESOLUTION_FAILSAFE (3 << INTEL_DP_RESOLUTION_SHIFT_MASK)
struct dp_link_dpll {
int clock;
struct dpll dpll;
};
static const struct dp_link_dpll g4x_dpll[] = {
{ 162000,
{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
{ 270000,
{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
};
static const struct dp_link_dpll pch_dpll[] = {
{ 162000,
{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
{ 270000,
{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
};
static const struct dp_link_dpll vlv_dpll[] = {
{ 162000,
{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
{ 270000,
{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
};
/*
* CHV supports eDP 1.4 that have more link rates.
* Below only provides the fixed rate but exclude variable rate.
*/
static const struct dp_link_dpll chv_dpll[] = {
/*
* CHV requires to program fractional division for m2.
* m2 is stored in fixed point format using formula below
* (m2_int << 22) | m2_fraction
*/
{ 162000, /* m2_int = 32, m2_fraction = 1677722 */
{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
{ 270000, /* m2_int = 27, m2_fraction = 0 */
{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
};
/* Constants for DP DSC configurations */
static const u8 valid_dsc_bpp[] = {6, 8, 10, 12, 15};
/* With Single pipe configuration, HW is capable of supporting maximum
* of 4 slices per line.
*/
static const u8 valid_dsc_slicecount[] = {1, 2, 4};
/**
* intel_dp_is_edp - is the given port attached to an eDP panel (either CPU or PCH)
* @intel_dp: DP struct
*
* If a CPU or PCH DP output is attached to an eDP panel, this function
* will return true, and false otherwise.
*/
bool intel_dp_is_edp(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
return intel_dig_port->base.type == INTEL_OUTPUT_EDP;
}
static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
{
return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
}
static void intel_dp_link_down(struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state);
static bool edp_panel_vdd_on(struct intel_dp *intel_dp);
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
static void vlv_init_panel_power_sequencer(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state);
static void vlv_steal_power_sequencer(struct drm_i915_private *dev_priv,
enum pipe pipe);
static void intel_dp_unset_edid(struct intel_dp *intel_dp);
/* update sink rates from dpcd */
static void intel_dp_set_sink_rates(struct intel_dp *intel_dp)
{
static const int dp_rates[] = {
162000, 270000, 540000, 810000
};
int i, max_rate;
max_rate = drm_dp_bw_code_to_link_rate(intel_dp->dpcd[DP_MAX_LINK_RATE]);
for (i = 0; i < ARRAY_SIZE(dp_rates); i++) {
if (dp_rates[i] > max_rate)
break;
intel_dp->sink_rates[i] = dp_rates[i];
}
intel_dp->num_sink_rates = i;
}
/* Get length of rates array potentially limited by max_rate. */
static int intel_dp_rate_limit_len(const int *rates, int len, int max_rate)
{
int i;
/* Limit results by potentially reduced max rate */
for (i = 0; i < len; i++) {
if (rates[len - i - 1] <= max_rate)
return len - i;
}
return 0;
}
/* Get length of common rates array potentially limited by max_rate. */
static int intel_dp_common_len_rate_limit(const struct intel_dp *intel_dp,
int max_rate)
{
return intel_dp_rate_limit_len(intel_dp->common_rates,
intel_dp->num_common_rates, max_rate);
}
/* Theoretical max between source and sink */
static int intel_dp_max_common_rate(struct intel_dp *intel_dp)
{
return intel_dp->common_rates[intel_dp->num_common_rates - 1];
}
/* Theoretical max between source and sink */
static int intel_dp_max_common_lane_count(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
int source_max = intel_dig_port->max_lanes;
int sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
int fia_max = intel_tc_port_fia_max_lane_count(intel_dig_port);
return min3(source_max, sink_max, fia_max);
}
int intel_dp_max_lane_count(struct intel_dp *intel_dp)
{
return intel_dp->max_link_lane_count;
}
int
intel_dp_link_required(int pixel_clock, int bpp)
{
/* pixel_clock is in kHz, divide bpp by 8 for bit to Byte conversion */
return DIV_ROUND_UP(pixel_clock * bpp, 8);
}
int
intel_dp_max_data_rate(int max_link_clock, int max_lanes)
{
/* max_link_clock is the link symbol clock (LS_Clk) in kHz and not the
* link rate that is generally expressed in Gbps. Since, 8 bits of data
* is transmitted every LS_Clk per lane, there is no need to account for
* the channel encoding that is done in the PHY layer here.
*/
return max_link_clock * max_lanes;
}
static int
intel_dp_downstream_max_dotclock(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &intel_dig_port->base;
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
int max_dotclk = dev_priv->max_dotclk_freq;
int ds_max_dotclk;
int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
if (type != DP_DS_PORT_TYPE_VGA)
return max_dotclk;
ds_max_dotclk = drm_dp_downstream_max_clock(intel_dp->dpcd,
intel_dp->downstream_ports);
if (ds_max_dotclk != 0)
max_dotclk = min(max_dotclk, ds_max_dotclk);
return max_dotclk;
}
static int cnl_max_source_rate(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
enum port port = dig_port->base.port;
u32 voltage = I915_READ(CNL_PORT_COMP_DW3) & VOLTAGE_INFO_MASK;
/* Low voltage SKUs are limited to max of 5.4G */
if (voltage == VOLTAGE_INFO_0_85V)
return 540000;
/* For this SKU 8.1G is supported in all ports */
if (IS_CNL_WITH_PORT_F(dev_priv))
return 810000;
/* For other SKUs, max rate on ports A and D is 5.4G */
if (port == PORT_A || port == PORT_D)
return 540000;
return 810000;
}
static int icl_max_source_rate(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
enum phy phy = intel_port_to_phy(dev_priv, dig_port->base.port);
if (intel_phy_is_combo(dev_priv, phy) &&
!IS_ELKHARTLAKE(dev_priv) &&
!intel_dp_is_edp(intel_dp))
return 540000;
return 810000;
}
static void
intel_dp_set_source_rates(struct intel_dp *intel_dp)
{
/* The values must be in increasing order */
static const int cnl_rates[] = {
162000, 216000, 270000, 324000, 432000, 540000, 648000, 810000
};
static const int bxt_rates[] = {
162000, 216000, 243000, 270000, 324000, 432000, 540000
};
static const int skl_rates[] = {
162000, 216000, 270000, 324000, 432000, 540000
};
static const int hsw_rates[] = {
162000, 270000, 540000
};
static const int g4x_rates[] = {
162000, 270000
};
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
const struct ddi_vbt_port_info *info =
&dev_priv->vbt.ddi_port_info[dig_port->base.port];
const int *source_rates;
int size, max_rate = 0, vbt_max_rate = info->dp_max_link_rate;
/* This should only be done once */
WARN_ON(intel_dp->source_rates || intel_dp->num_source_rates);
if (INTEL_GEN(dev_priv) >= 10) {
source_rates = cnl_rates;
size = ARRAY_SIZE(cnl_rates);
if (IS_GEN(dev_priv, 10))
max_rate = cnl_max_source_rate(intel_dp);
else
max_rate = icl_max_source_rate(intel_dp);
} else if (IS_GEN9_LP(dev_priv)) {
source_rates = bxt_rates;
size = ARRAY_SIZE(bxt_rates);
} else if (IS_GEN9_BC(dev_priv)) {
source_rates = skl_rates;
size = ARRAY_SIZE(skl_rates);
} else if ((IS_HASWELL(dev_priv) && !IS_HSW_ULX(dev_priv)) ||
IS_BROADWELL(dev_priv)) {
source_rates = hsw_rates;
size = ARRAY_SIZE(hsw_rates);
} else {
source_rates = g4x_rates;
size = ARRAY_SIZE(g4x_rates);
}
if (max_rate && vbt_max_rate)
max_rate = min(max_rate, vbt_max_rate);
else if (vbt_max_rate)
max_rate = vbt_max_rate;
if (max_rate)
size = intel_dp_rate_limit_len(source_rates, size, max_rate);
intel_dp->source_rates = source_rates;
intel_dp->num_source_rates = size;
}
static int intersect_rates(const int *source_rates, int source_len,
const int *sink_rates, int sink_len,
int *common_rates)
{
int i = 0, j = 0, k = 0;
while (i < source_len && j < sink_len) {
if (source_rates[i] == sink_rates[j]) {
if (WARN_ON(k >= DP_MAX_SUPPORTED_RATES))
return k;
common_rates[k] = source_rates[i];
++k;
++i;
++j;
} else if (source_rates[i] < sink_rates[j]) {
++i;
} else {
++j;
}
}
return k;
}
/* return index of rate in rates array, or -1 if not found */
static int intel_dp_rate_index(const int *rates, int len, int rate)
{
int i;
for (i = 0; i < len; i++)
if (rate == rates[i])
return i;
return -1;
}
static void intel_dp_set_common_rates(struct intel_dp *intel_dp)
{
WARN_ON(!intel_dp->num_source_rates || !intel_dp->num_sink_rates);
intel_dp->num_common_rates = intersect_rates(intel_dp->source_rates,
intel_dp->num_source_rates,
intel_dp->sink_rates,
intel_dp->num_sink_rates,
intel_dp->common_rates);
/* Paranoia, there should always be something in common. */
if (WARN_ON(intel_dp->num_common_rates == 0)) {
intel_dp->common_rates[0] = 162000;
intel_dp->num_common_rates = 1;
}
}
static bool intel_dp_link_params_valid(struct intel_dp *intel_dp, int link_rate,
u8 lane_count)
{
/*
* FIXME: we need to synchronize the current link parameters with
* hardware readout. Currently fast link training doesn't work on
* boot-up.
*/
if (link_rate == 0 ||
link_rate > intel_dp->max_link_rate)
return false;
if (lane_count == 0 ||
lane_count > intel_dp_max_lane_count(intel_dp))
return false;
return true;
}
static bool intel_dp_can_link_train_fallback_for_edp(struct intel_dp *intel_dp,
int link_rate,
u8 lane_count)
{
const struct drm_display_mode *fixed_mode =
intel_dp->attached_connector->panel.fixed_mode;
int mode_rate, max_rate;
mode_rate = intel_dp_link_required(fixed_mode->clock, 18);
max_rate = intel_dp_max_data_rate(link_rate, lane_count);
if (mode_rate > max_rate)
return false;
return true;
}
int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
int link_rate, u8 lane_count)
{
int index;
index = intel_dp_rate_index(intel_dp->common_rates,
intel_dp->num_common_rates,
link_rate);
if (index > 0) {
if (intel_dp_is_edp(intel_dp) &&
!intel_dp_can_link_train_fallback_for_edp(intel_dp,
intel_dp->common_rates[index - 1],
lane_count)) {
DRM_DEBUG_KMS("Retrying Link training for eDP with same parameters\n");
return 0;
}
intel_dp->max_link_rate = intel_dp->common_rates[index - 1];
intel_dp->max_link_lane_count = lane_count;
} else if (lane_count > 1) {
if (intel_dp_is_edp(intel_dp) &&
!intel_dp_can_link_train_fallback_for_edp(intel_dp,
intel_dp_max_common_rate(intel_dp),
lane_count >> 1)) {
DRM_DEBUG_KMS("Retrying Link training for eDP with same parameters\n");
return 0;
}
intel_dp->max_link_rate = intel_dp_max_common_rate(intel_dp);
intel_dp->max_link_lane_count = lane_count >> 1;
} else {
DRM_ERROR("Link Training Unsuccessful\n");
return -1;
}
return 0;
}
u32 intel_dp_mode_to_fec_clock(u32 mode_clock)
{
return div_u64(mul_u32_u32(mode_clock, 1000000U),
DP_DSC_FEC_OVERHEAD_FACTOR);
}
static u16 intel_dp_dsc_get_output_bpp(u32 link_clock, u32 lane_count,
u32 mode_clock, u32 mode_hdisplay)
{
u32 bits_per_pixel, max_bpp_small_joiner_ram;
int i;
/*
* Available Link Bandwidth(Kbits/sec) = (NumberOfLanes)*
* (LinkSymbolClock)* 8 * (TimeSlotsPerMTP)
* for SST -> TimeSlotsPerMTP is 1,
* for MST -> TimeSlotsPerMTP has to be calculated
*/
bits_per_pixel = (link_clock * lane_count * 8) /
intel_dp_mode_to_fec_clock(mode_clock);
DRM_DEBUG_KMS("Max link bpp: %u\n", bits_per_pixel);
/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
max_bpp_small_joiner_ram = DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER / mode_hdisplay;
DRM_DEBUG_KMS("Max small joiner bpp: %u\n", max_bpp_small_joiner_ram);
/*
* Greatest allowed DSC BPP = MIN (output BPP from available Link BW
* check, output bpp from small joiner RAM check)
*/
bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
/* Error out if the max bpp is less than smallest allowed valid bpp */
if (bits_per_pixel < valid_dsc_bpp[0]) {
DRM_DEBUG_KMS("Unsupported BPP %u, min %u\n",
bits_per_pixel, valid_dsc_bpp[0]);
return 0;
}
/* Find the nearest match in the array of known BPPs from VESA */
for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp) - 1; i++) {
if (bits_per_pixel < valid_dsc_bpp[i + 1])
break;
}
bits_per_pixel = valid_dsc_bpp[i];
/*
* Compressed BPP in U6.4 format so multiply by 16, for Gen 11,
* fractional part is 0
*/
return bits_per_pixel << 4;
}
static u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
int mode_clock, int mode_hdisplay)
{
u8 min_slice_count, i;
int max_slice_width;
if (mode_clock <= DP_DSC_PEAK_PIXEL_RATE)
min_slice_count = DIV_ROUND_UP(mode_clock,
DP_DSC_MAX_ENC_THROUGHPUT_0);
else
min_slice_count = DIV_ROUND_UP(mode_clock,
DP_DSC_MAX_ENC_THROUGHPUT_1);
max_slice_width = drm_dp_dsc_sink_max_slice_width(intel_dp->dsc_dpcd);
if (max_slice_width < DP_DSC_MIN_SLICE_WIDTH_VALUE) {
DRM_DEBUG_KMS("Unsupported slice width %d by DP DSC Sink device\n",
max_slice_width);
return 0;
}
/* Also take into account max slice width */
min_slice_count = min_t(u8, min_slice_count,
DIV_ROUND_UP(mode_hdisplay,
max_slice_width));
/* Find the closest match to the valid slice count values */
for (i = 0; i < ARRAY_SIZE(valid_dsc_slicecount); i++) {
if (valid_dsc_slicecount[i] >
drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
false))
break;
if (min_slice_count <= valid_dsc_slicecount[i])
return valid_dsc_slicecount[i];
}
DRM_DEBUG_KMS("Unsupported Slice Count %d\n", min_slice_count);
return 0;
}
static enum drm_mode_status
intel_dp_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
struct drm_i915_private *dev_priv = to_i915(connector->dev);
int target_clock = mode->clock;
int max_rate, mode_rate, max_lanes, max_link_clock;
int max_dotclk;
u16 dsc_max_output_bpp = 0;
u8 dsc_slice_count = 0;
if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
return MODE_NO_DBLESCAN;
max_dotclk = intel_dp_downstream_max_dotclock(intel_dp);
if (intel_dp_is_edp(intel_dp) && fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
target_clock = fixed_mode->clock;
}
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);
max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
mode_rate = intel_dp_link_required(target_clock, 18);
/*
* Output bpp is stored in 6.4 format so right shift by 4 to get the
* integer value since we support only integer values of bpp.
*/
if ((INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) &&
drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
if (intel_dp_is_edp(intel_dp)) {
dsc_max_output_bpp =
drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4;
dsc_slice_count =
drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
true);
} else if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) {
dsc_max_output_bpp =
intel_dp_dsc_get_output_bpp(max_link_clock,
max_lanes,
target_clock,
mode->hdisplay) >> 4;
dsc_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
target_clock,
mode->hdisplay);
}
}
if ((mode_rate > max_rate && !(dsc_max_output_bpp && dsc_slice_count)) ||
target_clock > max_dotclk)
return MODE_CLOCK_HIGH;
if (mode->clock < 10000)
return MODE_CLOCK_LOW;
if (mode->flags & DRM_MODE_FLAG_DBLCLK)
return MODE_H_ILLEGAL;
return MODE_OK;
}
u32 intel_dp_pack_aux(const u8 *src, int src_bytes)
{
int i;
u32 v = 0;
if (src_bytes > 4)
src_bytes = 4;
for (i = 0; i < src_bytes; i++)
v |= ((u32)src[i]) << ((3 - i) * 8);
return v;
}
static void intel_dp_unpack_aux(u32 src, u8 *dst, int dst_bytes)
{
int i;
if (dst_bytes > 4)
dst_bytes = 4;
for (i = 0; i < dst_bytes; i++)
dst[i] = src >> ((3-i) * 8);
}
static void
intel_dp_init_panel_power_sequencer(struct intel_dp *intel_dp);
static void
intel_dp_init_panel_power_sequencer_registers(struct intel_dp *intel_dp,
bool force_disable_vdd);
static void
intel_dp_pps_init(struct intel_dp *intel_dp);
static intel_wakeref_t
pps_lock(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
intel_wakeref_t wakeref;
/*
* See intel_power_sequencer_reset() why we need
* a power domain reference here.
*/
wakeref = intel_display_power_get(dev_priv,
intel_aux_power_domain(dp_to_dig_port(intel_dp)));
mutex_lock(&dev_priv->pps_mutex);
return wakeref;
}
static intel_wakeref_t
pps_unlock(struct intel_dp *intel_dp, intel_wakeref_t wakeref)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
mutex_unlock(&dev_priv->pps_mutex);
intel_display_power_put(dev_priv,
intel_aux_power_domain(dp_to_dig_port(intel_dp)),
wakeref);
return 0;
}
#define with_pps_lock(dp, wf) \
for ((wf) = pps_lock(dp); (wf); (wf) = pps_unlock((dp), (wf)))
static void
vlv_power_sequencer_kick(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum pipe pipe = intel_dp->pps_pipe;
bool pll_enabled, release_cl_override = false;
enum dpio_phy phy = DPIO_PHY(pipe);
enum dpio_channel ch = vlv_pipe_to_channel(pipe);
u32 DP;
if (WARN(I915_READ(intel_dp->output_reg) & DP_PORT_EN,
"skipping pipe %c power sequencer kick due to port %c being active\n",
pipe_name(pipe), port_name(intel_dig_port->base.port)))
return;
DRM_DEBUG_KMS("kicking pipe %c power sequencer for port %c\n",
pipe_name(pipe), port_name(intel_dig_port->base.port));
/* Preserve the BIOS-computed detected bit. This is
* supposed to be read-only.
*/
DP = I915_READ(intel_dp->output_reg) & DP_DETECTED;
DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
DP |= DP_PORT_WIDTH(1);
DP |= DP_LINK_TRAIN_PAT_1;
if (IS_CHERRYVIEW(dev_priv))
DP |= DP_PIPE_SEL_CHV(pipe);
else
DP |= DP_PIPE_SEL(pipe);
pll_enabled = I915_READ(DPLL(pipe)) & DPLL_VCO_ENABLE;
/*
* The DPLL for the pipe must be enabled for this to work.
* So enable temporarily it if it's not already enabled.
*/
if (!pll_enabled) {
release_cl_override = IS_CHERRYVIEW(dev_priv) &&
!chv_phy_powergate_ch(dev_priv, phy, ch, true);
if (vlv_force_pll_on(dev_priv, pipe, IS_CHERRYVIEW(dev_priv) ?
&chv_dpll[0].dpll : &vlv_dpll[0].dpll)) {
DRM_ERROR("Failed to force on pll for pipe %c!\n",
pipe_name(pipe));
return;
}
}
/*
* Similar magic as in intel_dp_enable_port().
* We _must_ do this port enable + disable trick
* to make this power sequencer lock onto the port.
* Otherwise even VDD force bit won't work.
*/
I915_WRITE(intel_dp->output_reg, DP);
POSTING_READ(intel_dp->output_reg);
I915_WRITE(intel_dp->output_reg, DP | DP_PORT_EN);
POSTING_READ(intel_dp->output_reg);
I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
POSTING_READ(intel_dp->output_reg);
if (!pll_enabled) {
vlv_force_pll_off(dev_priv, pipe);
if (release_cl_override)
chv_phy_powergate_ch(dev_priv, phy, ch, false);
}
}
static enum pipe vlv_find_free_pps(struct drm_i915_private *dev_priv)
{
struct intel_encoder *encoder;
unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B);
/*
* We don't have power sequencer currently.
* Pick one that's not used by other ports.
*/
for_each_intel_dp(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
if (encoder->type == INTEL_OUTPUT_EDP) {
WARN_ON(intel_dp->active_pipe != INVALID_PIPE &&
intel_dp->active_pipe != intel_dp->pps_pipe);
if (intel_dp->pps_pipe != INVALID_PIPE)
pipes &= ~(1 << intel_dp->pps_pipe);
} else {
WARN_ON(intel_dp->pps_pipe != INVALID_PIPE);
if (intel_dp->active_pipe != INVALID_PIPE)
pipes &= ~(1 << intel_dp->active_pipe);
}
}
if (pipes == 0)
return INVALID_PIPE;
return ffs(pipes) - 1;
}
static enum pipe
vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum pipe pipe;
lockdep_assert_held(&dev_priv->pps_mutex);
/* We should never land here with regular DP ports */
WARN_ON(!intel_dp_is_edp(intel_dp));
WARN_ON(intel_dp->active_pipe != INVALID_PIPE &&
intel_dp->active_pipe != intel_dp->pps_pipe);
if (intel_dp->pps_pipe != INVALID_PIPE)
return intel_dp->pps_pipe;
pipe = vlv_find_free_pps(dev_priv);
/*
* Didn't find one. This should not happen since there
* are two power sequencers and up to two eDP ports.
*/
if (WARN_ON(pipe == INVALID_PIPE))
pipe = PIPE_A;
vlv_steal_power_sequencer(dev_priv, pipe);
intel_dp->pps_pipe = pipe;
DRM_DEBUG_KMS("picked pipe %c power sequencer for port %c\n",
pipe_name(intel_dp->pps_pipe),
port_name(intel_dig_port->base.port));
/* init power sequencer on this pipe and port */
intel_dp_init_panel_power_sequencer(intel_dp);
intel_dp_init_panel_power_sequencer_registers(intel_dp, true);
/*
* Even vdd force doesn't work until we've made
* the power sequencer lock in on the port.
*/
vlv_power_sequencer_kick(intel_dp);
return intel_dp->pps_pipe;
}
static int
bxt_power_sequencer_idx(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
int backlight_controller = dev_priv->vbt.backlight.controller;
lockdep_assert_held(&dev_priv->pps_mutex);
/* We should never land here with regular DP ports */
WARN_ON(!intel_dp_is_edp(intel_dp));
if (!intel_dp->pps_reset)
return backlight_controller;
intel_dp->pps_reset = false;
/*
* Only the HW needs to be reprogrammed, the SW state is fixed and
* has been setup during connector init.
*/
intel_dp_init_panel_power_sequencer_registers(intel_dp, false);
return backlight_controller;
}
typedef bool (*vlv_pipe_check)(struct drm_i915_private *dev_priv,
enum pipe pipe);
static bool vlv_pipe_has_pp_on(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return I915_READ(PP_STATUS(pipe)) & PP_ON;
}
static bool vlv_pipe_has_vdd_on(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return I915_READ(PP_CONTROL(pipe)) & EDP_FORCE_VDD;
}
static bool vlv_pipe_any(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return true;
}
static enum pipe
vlv_initial_pps_pipe(struct drm_i915_private *dev_priv,
enum port port,
vlv_pipe_check pipe_check)
{
enum pipe pipe;
for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
u32 port_sel = I915_READ(PP_ON_DELAYS(pipe)) &
PANEL_PORT_SELECT_MASK;
if (port_sel != PANEL_PORT_SELECT_VLV(port))
continue;
if (!pipe_check(dev_priv, pipe))
continue;
return pipe;
}
return INVALID_PIPE;
}
static void
vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum port port = intel_dig_port->base.port;
lockdep_assert_held(&dev_priv->pps_mutex);
/* try to find a pipe with this port selected */
/* first pick one where the panel is on */
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_has_pp_on);
/* didn't find one? pick one where vdd is on */
if (intel_dp->pps_pipe == INVALID_PIPE)
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_has_vdd_on);
/* didn't find one? pick one with just the correct port */
if (intel_dp->pps_pipe == INVALID_PIPE)
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_any);
/* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
if (intel_dp->pps_pipe == INVALID_PIPE) {
DRM_DEBUG_KMS("no initial power sequencer for port %c\n",
port_name(port));
return;
}
DRM_DEBUG_KMS("initial power sequencer for port %c: pipe %c\n",
port_name(port), pipe_name(intel_dp->pps_pipe));
intel_dp_init_panel_power_sequencer(intel_dp);
intel_dp_init_panel_power_sequencer_registers(intel_dp, false);
}
void intel_power_sequencer_reset(struct drm_i915_private *dev_priv)
{
struct intel_encoder *encoder;
if (WARN_ON(!IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv) &&
!IS_GEN9_LP(dev_priv)))
return;
/*
* We can't grab pps_mutex here due to deadlock with power_domain
* mutex when power_domain functions are called while holding pps_mutex.
* That also means that in order to use pps_pipe the code needs to
* hold both a power domain reference and pps_mutex, and the power domain
* reference get/put must be done while _not_ holding pps_mutex.
* pps_{lock,unlock}() do these steps in the correct order, so one
* should use them always.
*/
for_each_intel_dp(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
WARN_ON(intel_dp->active_pipe != INVALID_PIPE);
if (encoder->type != INTEL_OUTPUT_EDP)
continue;
if (IS_GEN9_LP(dev_priv))
intel_dp->pps_reset = true;
else
intel_dp->pps_pipe = INVALID_PIPE;
}
}
struct pps_registers {
i915_reg_t pp_ctrl;
i915_reg_t pp_stat;
i915_reg_t pp_on;
i915_reg_t pp_off;
i915_reg_t pp_div;
};
static void intel_pps_get_registers(struct intel_dp *intel_dp,
struct pps_registers *regs)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
int pps_idx = 0;
memset(regs, 0, sizeof(*regs));
if (IS_GEN9_LP(dev_priv))
pps_idx = bxt_power_sequencer_idx(intel_dp);
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
pps_idx = vlv_power_sequencer_pipe(intel_dp);
regs->pp_ctrl = PP_CONTROL(pps_idx);
regs->pp_stat = PP_STATUS(pps_idx);
regs->pp_on = PP_ON_DELAYS(pps_idx);
regs->pp_off = PP_OFF_DELAYS(pps_idx);
/* Cycle delay moved from PP_DIVISOR to PP_CONTROL */
if (IS_GEN9_LP(dev_priv) || INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
regs->pp_div = INVALID_MMIO_REG;
else
regs->pp_div = PP_DIVISOR(pps_idx);
}
static i915_reg_t
_pp_ctrl_reg(struct intel_dp *intel_dp)
{
struct pps_registers regs;
intel_pps_get_registers(intel_dp, &regs);
return regs.pp_ctrl;
}
static i915_reg_t
_pp_stat_reg(struct intel_dp *intel_dp)
{
struct pps_registers regs;
intel_pps_get_registers(intel_dp, &regs);
return regs.pp_stat;
}
/* Reboot notifier handler to shutdown panel power to guarantee T12 timing
This function only applicable when panel PM state is not to be tracked */
static int edp_notify_handler(struct notifier_block *this, unsigned long code,
void *unused)
{
struct intel_dp *intel_dp = container_of(this, typeof(* intel_dp),
edp_notifier);
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
intel_wakeref_t wakeref;
if (!intel_dp_is_edp(intel_dp) || code != SYS_RESTART)
return 0;
with_pps_lock(intel_dp, wakeref) {
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
i915_reg_t pp_ctrl_reg, pp_div_reg;
u32 pp_div;
pp_ctrl_reg = PP_CONTROL(pipe);
pp_div_reg = PP_DIVISOR(pipe);
pp_div = I915_READ(pp_div_reg);
pp_div &= PP_REFERENCE_DIVIDER_MASK;
/* 0x1F write to PP_DIV_REG sets max cycle delay */
I915_WRITE(pp_div_reg, pp_div | 0x1F);
I915_WRITE(pp_ctrl_reg, PANEL_UNLOCK_REGS);
msleep(intel_dp->panel_power_cycle_delay);
}
}
return 0;
}
static bool edp_have_panel_power(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
lockdep_assert_held(&dev_priv->pps_mutex);
if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
intel_dp->pps_pipe == INVALID_PIPE)
return false;
return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;
}
static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
lockdep_assert_held(&dev_priv->pps_mutex);
if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
intel_dp->pps_pipe == INVALID_PIPE)
return false;
return I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD;
}
static void
intel_dp_check_edp(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
if (!intel_dp_is_edp(intel_dp))
return;
if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
WARN(1, "eDP powered off while attempting aux channel communication.\n");
DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",
I915_READ(_pp_stat_reg(intel_dp)),
I915_READ(_pp_ctrl_reg(intel_dp)));
}
}
static u32
intel_dp_aux_wait_done(struct intel_dp *intel_dp)
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
u32 status;
bool done;
#define C (((status = intel_uncore_read_notrace(&i915->uncore, ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
done = wait_event_timeout(i915->gmbus_wait_queue, C,
msecs_to_jiffies_timeout(10));
/* just trace the final value */
trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
if (!done)
DRM_ERROR("dp aux hw did not signal timeout!\n");
#undef C
return status;
}
static u32 g4x_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
if (index)
return 0;
/*
* The clock divider is based off the hrawclk, and would like to run at
* 2MHz. So, take the hrawclk value and divide by 2000 and use that
*/
return DIV_ROUND_CLOSEST(dev_priv->rawclk_freq, 2000);
}
static u32 ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
if (index)
return 0;
/*
* The clock divider is based off the cdclk or PCH rawclk, and would
* like to run at 2MHz. So, take the cdclk or PCH rawclk value and
* divide by 2000 and use that
*/
if (dig_port->aux_ch == AUX_CH_A)
return DIV_ROUND_CLOSEST(dev_priv->cdclk.hw.cdclk, 2000);
else
return DIV_ROUND_CLOSEST(dev_priv->rawclk_freq, 2000);
}
static u32 hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
if (dig_port->aux_ch != AUX_CH_A && HAS_PCH_LPT_H(dev_priv)) {
/* Workaround for non-ULT HSW */
switch (index) {
case 0: return 63;
case 1: return 72;
default: return 0;
}
}
return ilk_get_aux_clock_divider(intel_dp, index);
}
static u32 skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
/*
* SKL doesn't need us to program the AUX clock divider (Hardware will
* derive the clock from CDCLK automatically). We still implement the
* get_aux_clock_divider vfunc to plug-in into the existing code.
*/
return index ? 0 : 1;
}
static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
int send_bytes,
u32 aux_clock_divider)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv =
to_i915(intel_dig_port->base.base.dev);
u32 precharge, timeout;
if (IS_GEN(dev_priv, 6))
precharge = 3;
else
precharge = 5;
if (IS_BROADWELL(dev_priv))
timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
else
timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
return DP_AUX_CH_CTL_SEND_BUSY |
DP_AUX_CH_CTL_DONE |
DP_AUX_CH_CTL_INTERRUPT |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
timeout |
DP_AUX_CH_CTL_RECEIVE_ERROR |
(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);
}
static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp,
int send_bytes,
u32 unused)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *i915 =
to_i915(intel_dig_port->base.base.dev);
enum phy phy = intel_port_to_phy(i915, intel_dig_port->base.port);
u32 ret;
ret = DP_AUX_CH_CTL_SEND_BUSY |
DP_AUX_CH_CTL_DONE |
DP_AUX_CH_CTL_INTERRUPT |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
DP_AUX_CH_CTL_TIME_OUT_MAX |
DP_AUX_CH_CTL_RECEIVE_ERROR |
(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(32) |
DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
if (intel_phy_is_tc(i915, phy) &&
intel_dig_port->tc_mode == TC_PORT_TBT_ALT)
ret |= DP_AUX_CH_CTL_TBT_IO;
return ret;
}
static int
intel_dp_aux_xfer(struct intel_dp *intel_dp,
const u8 *send, int send_bytes,
u8 *recv, int recv_size,
u32 aux_send_ctl_flags)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *i915 =
to_i915(intel_dig_port->base.base.dev);
struct intel_uncore *uncore = &i915->uncore;
enum phy phy = intel_port_to_phy(i915, intel_dig_port->base.port);
bool is_tc_port = intel_phy_is_tc(i915, phy);
i915_reg_t ch_ctl, ch_data[5];
u32 aux_clock_divider;
enum intel_display_power_domain aux_domain =
intel_aux_power_domain(intel_dig_port);
intel_wakeref_t aux_wakeref;
intel_wakeref_t pps_wakeref;
int i, ret, recv_bytes;
int try, clock = 0;
u32 status;
bool vdd;
ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
for (i = 0; i < ARRAY_SIZE(ch_data); i++)
ch_data[i] = intel_dp->aux_ch_data_reg(intel_dp, i);
if (is_tc_port)
intel_tc_port_lock(intel_dig_port);
aux_wakeref = intel_display_power_get(i915, aux_domain);
pps_wakeref = pps_lock(intel_dp);
/*
* We will be called with VDD already enabled for dpcd/edid/oui reads.
* In such cases we want to leave VDD enabled and it's up to upper layers
* to turn it off. But for eg. i2c-dev access we need to turn it on/off
* ourselves.
*/
vdd = edp_panel_vdd_on(intel_dp);
/* dp aux is extremely sensitive to irq latency, hence request the
* lowest possible wakeup latency and so prevent the cpu from going into
* deep sleep states.
*/
pm_qos_update_request(&i915->pm_qos, 0);
intel_dp_check_edp(intel_dp);
/* Try to wait for any previous AUX channel activity */
for (try = 0; try < 3; try++) {
status = intel_uncore_read_notrace(uncore, ch_ctl);
if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
break;
msleep(1);
}
/* just trace the final value */
trace_i915_reg_rw(false, ch_ctl, status, sizeof(status), true);
if (try == 3) {
static u32 last_status = -1;
const u32 status = intel_uncore_read(uncore, ch_ctl);
if (status != last_status) {
WARN(1, "dp_aux_ch not started status 0x%08x\n",
status);
last_status = status;
}
ret = -EBUSY;
goto out;
}
/* Only 5 data registers! */
if (WARN_ON(send_bytes > 20 || recv_size > 20)) {
ret = -E2BIG;
goto out;
}
while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
send_bytes,
aux_clock_divider);
send_ctl |= aux_send_ctl_flags;
/* Must try at least 3 times according to DP spec */
for (try = 0; try < 5; try++) {
/* Load the send data into the aux channel data registers */
for (i = 0; i < send_bytes; i += 4)
intel_uncore_write(uncore,
ch_data[i >> 2],
intel_dp_pack_aux(send + i,
send_bytes - i));
/* Send the command and wait for it to complete */
intel_uncore_write(uncore, ch_ctl, send_ctl);
status = intel_dp_aux_wait_done(intel_dp);
/* Clear done status and any errors */
intel_uncore_write(uncore,
ch_ctl,
status |
DP_AUX_CH_CTL_DONE |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
DP_AUX_CH_CTL_RECEIVE_ERROR);
/* DP CTS 1.2 Core Rev 1.1, 4.2.1.1 & 4.2.1.2
* 400us delay required for errors and timeouts
* Timeout errors from the HW already meet this
* requirement so skip to next iteration
*/
if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR)
continue;
if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
usleep_range(400, 500);
continue;
}
if (status & DP_AUX_CH_CTL_DONE)
goto done;
}
}
if ((status & DP_AUX_CH_CTL_DONE) == 0) {
DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
ret = -EBUSY;
goto out;
}
done:
/* Check for timeout or receive error.
* Timeouts occur when the sink is not connected
*/
if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
ret = -EIO;
goto out;
}
/* Timeouts occur when the device isn't connected, so they're
* "normal" -- don't fill the kernel log with these */
if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
ret = -ETIMEDOUT;
goto out;
}
/* Unload any bytes sent back from the other side */
recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
/*
* By BSpec: "Message sizes of 0 or >20 are not allowed."
* We have no idea of what happened so we return -EBUSY so
* drm layer takes care for the necessary retries.
*/
if (recv_bytes == 0 || recv_bytes > 20) {
DRM_DEBUG_KMS("Forbidden recv_bytes = %d on aux transaction\n",
recv_bytes);
ret = -EBUSY;
goto out;
}
if (recv_bytes > recv_size)
recv_bytes = recv_size;
for (i = 0; i < recv_bytes; i += 4)
intel_dp_unpack_aux(intel_uncore_read(uncore, ch_data[i >> 2]),
recv + i, recv_bytes - i);
ret = recv_bytes;
out:
pm_qos_update_request(&i915->pm_qos, PM_QOS_DEFAULT_VALUE);
if (vdd)
edp_panel_vdd_off(intel_dp, false);
pps_unlock(intel_dp, pps_wakeref);
intel_display_power_put_async(i915, aux_domain, aux_wakeref);
if (is_tc_port)
intel_tc_port_unlock(intel_dig_port);
return ret;
}
#define BARE_ADDRESS_SIZE 3
#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
static void
intel_dp_aux_header(u8 txbuf[HEADER_SIZE],
const struct drm_dp_aux_msg *msg)
{
txbuf[0] = (msg->request << 4) | ((msg->address >> 16) & 0xf);
txbuf[1] = (msg->address >> 8) & 0xff;
txbuf[2] = msg->address & 0xff;
txbuf[3] = msg->size - 1;
}
static ssize_t
intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
{
struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux);
u8 txbuf[20], rxbuf[20];
size_t txsize, rxsize;
int ret;
intel_dp_aux_header(txbuf, msg);
switch (msg->request & ~DP_AUX_I2C_MOT) {
case DP_AUX_NATIVE_WRITE:
case DP_AUX_I2C_WRITE:
case DP_AUX_I2C_WRITE_STATUS_UPDATE:
txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
rxsize = 2; /* 0 or 1 data bytes */
if (WARN_ON(txsize > 20))
return -E2BIG;
WARN_ON(!msg->buffer != !msg->size);
if (msg->buffer)
memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
rxbuf, rxsize, 0);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
if (ret > 1) {
/* Number of bytes written in a short write. */
ret = clamp_t(int, rxbuf[1], 0, msg->size);
} else {
/* Return payload size. */
ret = msg->size;
}
}
break;
case DP_AUX_NATIVE_READ:
case DP_AUX_I2C_READ:
txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
rxsize = msg->size + 1;
if (WARN_ON(rxsize > 20))
return -E2BIG;
ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
rxbuf, rxsize, 0);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
/*
* Assume happy day, and copy the data. The caller is
* expected to check msg->reply before touching it.
*
* Return payload size.
*/
ret--;
memcpy(msg->buffer, rxbuf + 1, ret);
}
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static i915_reg_t g4x_aux_ctl_reg(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
return DP_AUX_CH_CTL(aux_ch);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_CTL(AUX_CH_B);
}
}
static i915_reg_t g4x_aux_data_reg(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
return DP_AUX_CH_DATA(aux_ch, index);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_DATA(AUX_CH_B, index);
}
}
static i915_reg_t ilk_aux_ctl_reg(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_A:
return DP_AUX_CH_CTL(aux_ch);
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
return PCH_DP_AUX_CH_CTL(aux_ch);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_CTL(AUX_CH_A);
}
}
static i915_reg_t ilk_aux_data_reg(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_A:
return DP_AUX_CH_DATA(aux_ch, index);
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
return PCH_DP_AUX_CH_DATA(aux_ch, index);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_DATA(AUX_CH_A, index);
}
}
static i915_reg_t skl_aux_ctl_reg(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_A:
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
case AUX_CH_E:
case AUX_CH_F:
return DP_AUX_CH_CTL(aux_ch);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_CTL(AUX_CH_A);
}
}
static i915_reg_t skl_aux_data_reg(struct intel_dp *intel_dp, int index)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
enum aux_ch aux_ch = dig_port->aux_ch;
switch (aux_ch) {
case AUX_CH_A:
case AUX_CH_B:
case AUX_CH_C:
case AUX_CH_D:
case AUX_CH_E:
case AUX_CH_F:
return DP_AUX_CH_DATA(aux_ch, index);
default:
MISSING_CASE(aux_ch);
return DP_AUX_CH_DATA(AUX_CH_A, index);
}
}
static void
intel_dp_aux_fini(struct intel_dp *intel_dp)
{
kfree(intel_dp->aux.name);
}
static void
intel_dp_aux_init(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &dig_port->base;
if (INTEL_GEN(dev_priv) >= 9) {
intel_dp->aux_ch_ctl_reg = skl_aux_ctl_reg;
intel_dp->aux_ch_data_reg = skl_aux_data_reg;
} else if (HAS_PCH_SPLIT(dev_priv)) {
intel_dp->aux_ch_ctl_reg = ilk_aux_ctl_reg;
intel_dp->aux_ch_data_reg = ilk_aux_data_reg;
} else {
intel_dp->aux_ch_ctl_reg = g4x_aux_ctl_reg;
intel_dp->aux_ch_data_reg = g4x_aux_data_reg;
}
if (INTEL_GEN(dev_priv) >= 9)
intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider;
else if (IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
else if (HAS_PCH_SPLIT(dev_priv))
intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
else
intel_dp->get_aux_clock_divider = g4x_get_aux_clock_divider;
if (INTEL_GEN(dev_priv) >= 9)
intel_dp->get_aux_send_ctl = skl_get_aux_send_ctl;
else
intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl;
drm_dp_aux_init(&intel_dp->aux);
/* Failure to allocate our preferred name is not critical */
intel_dp->aux.name = kasprintf(GFP_KERNEL, "DPDDC-%c",
port_name(encoder->port));
intel_dp->aux.transfer = intel_dp_aux_transfer;
}
bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp)
{
int max_rate = intel_dp->source_rates[intel_dp->num_source_rates - 1];
return max_rate >= 540000;
}
bool intel_dp_source_supports_hbr3(struct intel_dp *intel_dp)
{
int max_rate = intel_dp->source_rates[intel_dp->num_source_rates - 1];
return max_rate >= 810000;
}
static void
intel_dp_set_clock(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
const struct dp_link_dpll *divisor = NULL;
int i, count = 0;
if (IS_G4X(dev_priv)) {
divisor = g4x_dpll;
count = ARRAY_SIZE(g4x_dpll);
} else if (HAS_PCH_SPLIT(dev_priv)) {
divisor = pch_dpll;
count = ARRAY_SIZE(pch_dpll);
} else if (IS_CHERRYVIEW(dev_priv)) {
divisor = chv_dpll;
count = ARRAY_SIZE(chv_dpll);
} else if (IS_VALLEYVIEW(dev_priv)) {
divisor = vlv_dpll;
count = ARRAY_SIZE(vlv_dpll);
}
if (divisor && count) {
for (i = 0; i < count; i++) {
if (pipe_config->port_clock == divisor[i].clock) {
pipe_config->dpll = divisor[i].dpll;
pipe_config->clock_set = true;
break;
}
}
}
}
static void snprintf_int_array(char *str, size_t len,
const int *array, int nelem)
{
int i;
str[0] = '\0';
for (i = 0; i < nelem; i++) {
int r = snprintf(str, len, "%s%d", i ? ", " : "", array[i]);
if (r >= len)
return;
str += r;
len -= r;
}
}
static void intel_dp_print_rates(struct intel_dp *intel_dp)
{
char str[128]; /* FIXME: too big for stack? */
if ((drm_debug & DRM_UT_KMS) == 0)
return;
snprintf_int_array(str, sizeof(str),
intel_dp->source_rates, intel_dp->num_source_rates);
DRM_DEBUG_KMS("source rates: %s\n", str);
snprintf_int_array(str, sizeof(str),
intel_dp->sink_rates, intel_dp->num_sink_rates);
DRM_DEBUG_KMS("sink rates: %s\n", str);
snprintf_int_array(str, sizeof(str),
intel_dp->common_rates, intel_dp->num_common_rates);
DRM_DEBUG_KMS("common rates: %s\n", str);
}
int
intel_dp_max_link_rate(struct intel_dp *intel_dp)
{
int len;
len = intel_dp_common_len_rate_limit(intel_dp, intel_dp->max_link_rate);
if (WARN_ON(len <= 0))
return 162000;
return intel_dp->common_rates[len - 1];
}
int intel_dp_rate_select(struct intel_dp *intel_dp, int rate)
{
int i = intel_dp_rate_index(intel_dp->sink_rates,
intel_dp->num_sink_rates, rate);
if (WARN_ON(i < 0))
i = 0;
return i;
}
void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
u8 *link_bw, u8 *rate_select)
{
/* eDP 1.4 rate select method. */
if (intel_dp->use_rate_select) {
*link_bw = 0;
*rate_select =
intel_dp_rate_select(intel_dp, port_clock);
} else {
*link_bw = drm_dp_link_rate_to_bw_code(port_clock);
*rate_select = 0;
}
}
static bool intel_dp_source_supports_fec(struct intel_dp *intel_dp,
const struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
return INTEL_GEN(dev_priv) >= 11 &&
pipe_config->cpu_transcoder != TRANSCODER_A;
}
static bool intel_dp_supports_fec(struct intel_dp *intel_dp,
const struct intel_crtc_state *pipe_config)
{
return intel_dp_source_supports_fec(intel_dp, pipe_config) &&
drm_dp_sink_supports_fec(intel_dp->fec_capable);
}
static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp,
const struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
return INTEL_GEN(dev_priv) >= 10 &&
pipe_config->cpu_transcoder != TRANSCODER_A;
}
static bool intel_dp_supports_dsc(struct intel_dp *intel_dp,
const struct intel_crtc_state *pipe_config)
{
if (!intel_dp_is_edp(intel_dp) && !pipe_config->fec_enable)
return false;
return intel_dp_source_supports_dsc(intel_dp, pipe_config) &&
drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd);
}
static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_connector *intel_connector = intel_dp->attached_connector;
int bpp, bpc;
bpp = pipe_config->pipe_bpp;
bpc = drm_dp_downstream_max_bpc(intel_dp->dpcd, intel_dp->downstream_ports);
if (bpc > 0)
bpp = min(bpp, 3*bpc);
if (intel_dp_is_edp(intel_dp)) {
/* Get bpp from vbt only for panels that dont have bpp in edid */
if (intel_connector->base.display_info.bpc == 0 &&
dev_priv->vbt.edp.bpp && dev_priv->vbt.edp.bpp < bpp) {
DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided %i\n",
dev_priv->vbt.edp.bpp);
bpp = dev_priv->vbt.edp.bpp;
}
}
return bpp;
}
/* Adjust link config limits based on compliance test requests. */
void
intel_dp_adjust_compliance_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct link_config_limits *limits)
{
/* For DP Compliance we override the computed bpp for the pipe */
if (intel_dp->compliance.test_data.bpc != 0) {
int bpp = 3 * intel_dp->compliance.test_data.bpc;
limits->min_bpp = limits->max_bpp = bpp;
pipe_config->dither_force_disable = bpp == 6 * 3;
DRM_DEBUG_KMS("Setting pipe_bpp to %d\n", bpp);
}
/* Use values requested by Compliance Test Request */
if (intel_dp->compliance.test_type == DP_TEST_LINK_TRAINING) {
int index;
/* Validate the compliance test data since max values
* might have changed due to link train fallback.
*/
if (intel_dp_link_params_valid(intel_dp, intel_dp->compliance.test_link_rate,
intel_dp->compliance.test_lane_count)) {
index = intel_dp_rate_index(intel_dp->common_rates,
intel_dp->num_common_rates,
intel_dp->compliance.test_link_rate);
if (index >= 0)
limits->min_clock = limits->max_clock = index;
limits->min_lane_count = limits->max_lane_count =
intel_dp->compliance.test_lane_count;
}
}
}
static int intel_dp_output_bpp(const struct intel_crtc_state *crtc_state, int bpp)
{
/*
* bpp value was assumed to RGB format. And YCbCr 4:2:0 output
* format of the number of bytes per pixel will be half the number
* of bytes of RGB pixel.
*/
if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
bpp /= 2;
return bpp;
}
/* Optimize link config in order: max bpp, min clock, min lanes */
static int
intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
const struct link_config_limits *limits)
{
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
int bpp, clock, lane_count;
int mode_rate, link_clock, link_avail;
for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
int output_bpp = intel_dp_output_bpp(pipe_config, bpp);
mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
output_bpp);
for (clock = limits->min_clock; clock <= limits->max_clock; clock++) {
for (lane_count = limits->min_lane_count;
lane_count <= limits->max_lane_count;
lane_count <<= 1) {
link_clock = intel_dp->common_rates[clock];
link_avail = intel_dp_max_data_rate(link_clock,
lane_count);
if (mode_rate <= link_avail) {
pipe_config->lane_count = lane_count;
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = link_clock;
return 0;
}
}
}
}
return -EINVAL;
}
static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
{
int i, num_bpc;
u8 dsc_bpc[3] = {0};
num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd,
dsc_bpc);
for (i = 0; i < num_bpc; i++) {
if (dsc_max_bpc >= dsc_bpc[i])
return dsc_bpc[i] * 3;
}
return 0;
}
static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
u8 dsc_max_bpc;
int pipe_bpp;
int ret;
pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
intel_dp_supports_fec(intel_dp, pipe_config);
if (!intel_dp_supports_dsc(intel_dp, pipe_config))
return -EINVAL;
dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
conn_state->max_requested_bpc);
pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
if (pipe_bpp < DP_DSC_MIN_SUPPORTED_BPC * 3) {
DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
return -EINVAL;
}
/*
* For now enable DSC for max bpp, max link rate, max lane count.
* Optimize this later for the minimum possible link rate/lane count
* with DSC enabled for the requested mode.
*/
pipe_config->pipe_bpp = pipe_bpp;
pipe_config->port_clock = intel_dp->common_rates[limits->max_clock];
pipe_config->lane_count = limits->max_lane_count;
if (intel_dp_is_edp(intel_dp)) {
pipe_config->dsc_params.compressed_bpp =
min_t(u16, drm_edp_dsc_sink_output_bpp(intel_dp->dsc_dpcd) >> 4,
pipe_config->pipe_bpp);
pipe_config->dsc_params.slice_count =
drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
true);
} else {
u16 dsc_max_output_bpp;
u8 dsc_dp_slice_count;
dsc_max_output_bpp =
intel_dp_dsc_get_output_bpp(pipe_config->port_clock,
pipe_config->lane_count,
adjusted_mode->crtc_clock,
adjusted_mode->crtc_hdisplay);
dsc_dp_slice_count =
intel_dp_dsc_get_slice_count(intel_dp,
adjusted_mode->crtc_clock,
adjusted_mode->crtc_hdisplay);
if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
return -EINVAL;
}
pipe_config->dsc_params.compressed_bpp = min_t(u16,
dsc_max_output_bpp >> 4,
pipe_config->pipe_bpp);
pipe_config->dsc_params.slice_count = dsc_dp_slice_count;
}
/*
* VDSC engine operates at 1 Pixel per clock, so if peak pixel rate
* is greater than the maximum Cdclock and if slice count is even
* then we need to use 2 VDSC instances.
*/
if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) {
if (pipe_config->dsc_params.slice_count > 1) {
pipe_config->dsc_params.dsc_split = true;
} else {
DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
return -EINVAL;
}
}
ret = intel_dp_compute_dsc_params(intel_dp, pipe_config);
if (ret < 0) {
DRM_DEBUG_KMS("Cannot compute valid DSC parameters for Input Bpp = %d "
"Compressed BPP = %d\n",
pipe_config->pipe_bpp,
pipe_config->dsc_params.compressed_bpp);
return ret;
}
pipe_config->dsc_params.compression_enable = true;
DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
"Compressed Bpp = %d Slice Count = %d\n",
pipe_config->pipe_bpp,
pipe_config->dsc_params.compressed_bpp,
pipe_config->dsc_params.slice_count);
return 0;
}
int intel_dp_min_bpp(const struct intel_crtc_state *crtc_state)
{
if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_RGB)
return 6 * 3;
else
return 8 * 3;
}
static int
intel_dp_compute_link_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
{
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct link_config_limits limits;
int common_len;
int ret;
common_len = intel_dp_common_len_rate_limit(intel_dp,
intel_dp->max_link_rate);
/* No common link rates between source and sink */
WARN_ON(common_len <= 0);
limits.min_clock = 0;
limits.max_clock = common_len - 1;
limits.min_lane_count = 1;
limits.max_lane_count = intel_dp_max_lane_count(intel_dp);
limits.min_bpp = intel_dp_min_bpp(pipe_config);
limits.max_bpp = intel_dp_compute_bpp(intel_dp, pipe_config);
if (intel_dp_is_edp(intel_dp)) {
/*
* Use the maximum clock and number of lanes the eDP panel
* advertizes being capable of. The panels are generally
* designed to support only a single clock and lane
* configuration, and typically these values correspond to the
* native resolution of the panel.
*/
limits.min_lane_count = limits.max_lane_count;
limits.min_clock = limits.max_clock;
}
intel_dp_adjust_compliance_config(intel_dp, pipe_config, &limits);
DRM_DEBUG_KMS("DP link computation with max lane count %i "
"max rate %d max bpp %d pixel clock %iKHz\n",
limits.max_lane_count,
intel_dp->common_rates[limits.max_clock],
limits.max_bpp, adjusted_mode->crtc_clock);
/*
* Optimize for slow and wide. This is the place to add alternative
* optimization policy.
*/
ret = intel_dp_compute_link_config_wide(intel_dp, pipe_config, &limits);
/* enable compression if the mode doesn't fit available BW */
DRM_DEBUG_KMS("Force DSC en = %d\n", intel_dp->force_dsc_en);
if (ret || intel_dp->force_dsc_en) {
ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits);
if (ret < 0)
return ret;
}
if (pipe_config->dsc_params.compression_enable) {
DRM_DEBUG_KMS("DP lane count %d clock %d Input bpp %d Compressed bpp %d\n",
pipe_config->lane_count, pipe_config->port_clock,
pipe_config->pipe_bpp,
pipe_config->dsc_params.compressed_bpp);
DRM_DEBUG_KMS("DP link rate required %i available %i\n",
intel_dp_link_required(adjusted_mode->crtc_clock,
pipe_config->dsc_params.compressed_bpp),
intel_dp_max_data_rate(pipe_config->port_clock,
pipe_config->lane_count));
} else {
DRM_DEBUG_KMS("DP lane count %d clock %d bpp %d\n",
pipe_config->lane_count, pipe_config->port_clock,
pipe_config->pipe_bpp);
DRM_DEBUG_KMS("DP link rate required %i available %i\n",
intel_dp_link_required(adjusted_mode->crtc_clock,
pipe_config->pipe_bpp),
intel_dp_max_data_rate(pipe_config->port_clock,
pipe_config->lane_count));
}
return 0;
}
static int
intel_dp_ycbcr420_config(struct intel_dp *intel_dp,
struct drm_connector *connector,
struct intel_crtc_state *crtc_state)
{
const struct drm_display_info *info = &connector->display_info;
const struct drm_display_mode *adjusted_mode =
&crtc_state->base.adjusted_mode;
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
int ret;
if (!drm_mode_is_420_only(info, adjusted_mode) ||
!intel_dp_get_colorimetry_status(intel_dp) ||
!connector->ycbcr_420_allowed)
return 0;
crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
/* YCBCR 420 output conversion needs a scaler */
ret = skl_update_scaler_crtc(crtc_state);
if (ret) {
DRM_DEBUG_KMS("Scaler allocation for output failed\n");
return ret;
}
intel_pch_panel_fitting(crtc, crtc_state, DRM_MODE_SCALE_FULLSCREEN);
return 0;
}
bool intel_dp_limited_color_range(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
const struct intel_digital_connector_state *intel_conn_state =
to_intel_digital_connector_state(conn_state);
const struct drm_display_mode *adjusted_mode =
&crtc_state->base.adjusted_mode;
if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
/*
* See:
* CEA-861-E - 5.1 Default Encoding Parameters
* VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
*/
return crtc_state->pipe_bpp != 18 &&
drm_default_rgb_quant_range(adjusted_mode) ==
HDMI_QUANTIZATION_RANGE_LIMITED;
} else {
return intel_conn_state->broadcast_rgb ==
INTEL_BROADCAST_RGB_LIMITED;
}
}
int
intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct intel_lspcon *lspcon = enc_to_intel_lspcon(&encoder->base);
enum port port = encoder->port;
struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
struct intel_connector *intel_connector = intel_dp->attached_connector;
struct intel_digital_connector_state *intel_conn_state =
to_intel_digital_connector_state(conn_state);
bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
DP_DPCD_QUIRK_CONSTANT_N);
int ret = 0, output_bpp;
if (HAS_PCH_SPLIT(dev_priv) && !HAS_DDI(dev_priv) && port != PORT_A)
pipe_config->has_pch_encoder = true;
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
if (lspcon->active)
lspcon_ycbcr420_config(&intel_connector->base, pipe_config);
else
ret = intel_dp_ycbcr420_config(intel_dp, &intel_connector->base,
pipe_config);
if (ret)
return ret;
pipe_config->has_drrs = false;
if (IS_G4X(dev_priv) || port == PORT_A)
pipe_config->has_audio = false;
else if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
pipe_config->has_audio = intel_dp->has_audio;
else
pipe_config->has_audio = intel_conn_state->force_audio == HDMI_AUDIO_ON;
if (intel_dp_is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
adjusted_mode);
if (INTEL_GEN(dev_priv) >= 9) {
ret = skl_update_scaler_crtc(pipe_config);
if (ret)
return ret;
}
if (HAS_GMCH(dev_priv))
intel_gmch_panel_fitting(intel_crtc, pipe_config,
conn_state->scaling_mode);
else
intel_pch_panel_fitting(intel_crtc, pipe_config,
conn_state->scaling_mode);
}
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
return -EINVAL;
if (HAS_GMCH(dev_priv) &&
adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
return -EINVAL;
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
return -EINVAL;
ret = intel_dp_compute_link_config(encoder, pipe_config, conn_state);
if (ret < 0)
return ret;
pipe_config->limited_color_range =
intel_dp_limited_color_range(pipe_config, conn_state);
if (pipe_config->dsc_params.compression_enable)
output_bpp = pipe_config->dsc_params.compressed_bpp;
else
output_bpp = intel_dp_output_bpp(pipe_config, pipe_config->pipe_bpp);
intel_link_compute_m_n(output_bpp,
pipe_config->lane_count,
adjusted_mode->crtc_clock,
pipe_config->port_clock,
&pipe_config->dp_m_n,
constant_n, pipe_config->fec_enable);
if (intel_connector->panel.downclock_mode != NULL &&
dev_priv->drrs.type == SEAMLESS_DRRS_SUPPORT) {
pipe_config->has_drrs = true;
intel_link_compute_m_n(output_bpp,
pipe_config->lane_count,
intel_connector->panel.downclock_mode->clock,
pipe_config->port_clock,
&pipe_config->dp_m2_n2,
constant_n, pipe_config->fec_enable);
}
if (!HAS_DDI(dev_priv))
intel_dp_set_clock(encoder, pipe_config);
intel_psr_compute_config(intel_dp, pipe_config);
return 0;
}
void intel_dp_set_link_params(struct intel_dp *intel_dp,
int link_rate, u8 lane_count,
bool link_mst)
{
intel_dp->link_trained = false;
intel_dp->link_rate = link_rate;
intel_dp->lane_count = lane_count;
intel_dp->link_mst = link_mst;
}
static void intel_dp_prepare(struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = encoder->port;
struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
intel_dp_set_link_params(intel_dp, pipe_config->port_clock,
pipe_config->lane_count,
intel_crtc_has_type(pipe_config,
INTEL_OUTPUT_DP_MST));
/*
* There are four kinds of DP registers:
*
* IBX PCH
* SNB CPU
* IVB CPU
* CPT PCH
*
* IBX PCH and CPU are the same for almost everything,
* except that the CPU DP PLL is configured in this
* register
*
* CPT PCH is quite different, having many bits moved
* to the TRANS_DP_CTL register instead. That
* configuration happens (oddly) in ironlake_pch_enable
*/
/* Preserve the BIOS-computed detected bit. This is
* supposed to be read-only.
*/
intel_dp->DP = I915_READ(intel_dp->output_reg) & DP_DETECTED;
/* Handle DP bits in common between all three register formats */
intel_dp->DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
intel_dp->DP |= DP_PORT_WIDTH(pipe_config->lane_count);
/* Split out the IBX/CPU vs CPT settings */
if (IS_IVYBRIDGE(dev_priv) && port == PORT_A) {
if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
intel_dp->DP |= DP_SYNC_HS_HIGH;
if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
intel_dp->DP |= DP_SYNC_VS_HIGH;
intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
intel_dp->DP |= DP_ENHANCED_FRAMING;
intel_dp->DP |= DP_PIPE_SEL_IVB(crtc->pipe);
} else if (HAS_PCH_CPT(dev_priv) && port != PORT_A) {
u32 trans_dp;
intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
trans_dp = I915_READ(TRANS_DP_CTL(crtc->pipe));
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
trans_dp |= TRANS_DP_ENH_FRAMING;
else
trans_dp &= ~TRANS_DP_ENH_FRAMING;
I915_WRITE(TRANS_DP_CTL(crtc->pipe), trans_dp);
} else {
if (IS_G4X(dev_priv) && pipe_config->limited_color_range)
intel_dp->DP |= DP_COLOR_RANGE_16_235;
if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
intel_dp->DP |= DP_SYNC_HS_HIGH;
if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
intel_dp->DP |= DP_SYNC_VS_HIGH;
intel_dp->DP |= DP_LINK_TRAIN_OFF;
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
intel_dp->DP |= DP_ENHANCED_FRAMING;
if (IS_CHERRYVIEW(dev_priv))
intel_dp->DP |= DP_PIPE_SEL_CHV(crtc->pipe);
else
intel_dp->DP |= DP_PIPE_SEL(crtc->pipe);
}
}
#define IDLE_ON_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | PP_SEQUENCE_STATE_MASK)
#define IDLE_ON_VALUE (PP_ON | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_ON_IDLE)
#define IDLE_OFF_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | 0)
#define IDLE_OFF_VALUE (0 | PP_SEQUENCE_NONE | 0 | 0)
#define IDLE_CYCLE_MASK (PP_ON | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
#define IDLE_CYCLE_VALUE (0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_OFF_IDLE)
static void intel_pps_verify_state(struct intel_dp *intel_dp);
static void wait_panel_status(struct intel_dp *intel_dp,
u32 mask,
u32 value)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
i915_reg_t pp_stat_reg, pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
intel_pps_verify_state(intel_dp);
pp_stat_reg = _pp_stat_reg(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n",
mask, value,
I915_READ(pp_stat_reg),
I915_READ(pp_ctrl_reg));
if (intel_de_wait_for_register(dev_priv, pp_stat_reg,
mask, value, 5000))
DRM_ERROR("Panel status timeout: status %08x control %08x\n",
I915_READ(pp_stat_reg),
I915_READ(pp_ctrl_reg));
DRM_DEBUG_KMS("Wait complete\n");
}
static void wait_panel_on(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power on\n");
wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
}
static void wait_panel_off(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power off time\n");
wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
}
static void wait_panel_power_cycle(struct intel_dp *intel_dp)
{
ktime_t panel_power_on_time;
s64 panel_power_off_duration;
DRM_DEBUG_KMS("Wait for panel power cycle\n");
/* take the difference of currrent time and panel power off time
* and then make panel wait for t11_t12 if needed. */
panel_power_on_time = ktime_get_boottime();
panel_power_off_duration = ktime_ms_delta(panel_power_on_time, intel_dp->panel_power_off_time);
/* When we disable the VDD override bit last we have to do the manual
* wait. */
if (panel_power_off_duration < (s64)intel_dp->panel_power_cycle_delay)
wait_remaining_ms_from_jiffies(jiffies,
intel_dp->panel_power_cycle_delay - panel_power_off_duration);
wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
}
static void wait_backlight_on(struct intel_dp *intel_dp)
{
wait_remaining_ms_from_jiffies(intel_dp->last_power_on,
intel_dp->backlight_on_delay);
}
static void edp_wait_backlight_off(struct intel_dp *intel_dp)
{
wait_remaining_ms_from_jiffies(intel_dp->last_backlight_off,
intel_dp->backlight_off_delay);
}
/* Read the current pp_control value, unlocking the register if it
* is locked
*/
static u32 ironlake_get_pp_control(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
u32 control;
lockdep_assert_held(&dev_priv->pps_mutex);
control = I915_READ(_pp_ctrl_reg(intel_dp));
if (WARN_ON(!HAS_DDI(dev_priv) &&
(control & PANEL_UNLOCK_MASK) != PANEL_UNLOCK_REGS)) {
control &= ~PANEL_UNLOCK_MASK;
control |= PANEL_UNLOCK_REGS;
}
return control;
}
/*
* Must be paired with edp_panel_vdd_off().
* Must hold pps_mutex around the whole on/off sequence.
* Can be nested with intel_edp_panel_vdd_{on,off}() calls.
*/
static bool edp_panel_vdd_on(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
u32 pp;
i915_reg_t pp_stat_reg, pp_ctrl_reg;
bool need_to_disable = !intel_dp->want_panel_vdd;
lockdep_assert_held(&dev_priv->pps_mutex);
if (!intel_dp_is_edp(intel_dp))
return false;
cancel_delayed_work(&intel_dp->panel_vdd_work);
intel_dp->want_panel_vdd = true;
if (edp_have_panel_vdd(intel_dp))
return need_to_disable;
intel_display_power_get(dev_priv,
intel_aux_power_domain(intel_dig_port));
DRM_DEBUG_KMS("Turning eDP port %c VDD on\n",
port_name(intel_dig_port->base.port));
if (!edp_have_panel_power(intel_dp))
wait_panel_power_cycle(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
pp |= EDP_FORCE_VDD;
pp_stat_reg = _pp_stat_reg(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
/*
* If the panel wasn't on, delay before accessing aux channel
*/
if (!edp_have_panel_power(intel_dp)) {
DRM_DEBUG_KMS("eDP port %c panel power wasn't enabled\n",
port_name(intel_dig_port->base.port));
msleep(intel_dp->panel_power_up_delay);
}
return need_to_disable;
}
/*
* Must be paired with intel_edp_panel_vdd_off() or
* intel_edp_panel_off().
* Nested calls to these functions are not allowed since
* we drop the lock. Caller must use some higher level
* locking to prevent nested calls from other threads.
*/
void intel_edp_panel_vdd_on(struct intel_dp *intel_dp)
{
intel_wakeref_t wakeref;
bool vdd;
if (!intel_dp_is_edp(intel_dp))
return;
vdd = false;
with_pps_lock(intel_dp, wakeref)
vdd = edp_panel_vdd_on(intel_dp);
I915_STATE_WARN(!vdd, "eDP port %c VDD already requested on\n",
port_name(dp_to_dig_port(intel_dp)->base.port));
}
static void edp_panel_vdd_off_sync(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *intel_dig_port =
dp_to_dig_port(intel_dp);
u32 pp;
i915_reg_t pp_stat_reg, pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
WARN_ON(intel_dp->want_panel_vdd);
if (!edp_have_panel_vdd(intel_dp))
return;
DRM_DEBUG_KMS("Turning eDP port %c VDD off\n",
port_name(intel_dig_port->base.port));
pp = ironlake_get_pp_control(intel_dp);
pp &= ~EDP_FORCE_VDD;
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
pp_stat_reg = _pp_stat_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
/* Make sure sequencer is idle before allowing subsequent activity */
DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
if ((pp & PANEL_POWER_ON) == 0)
intel_dp->panel_power_off_time = ktime_get_boottime();
intel_display_power_put_unchecked(dev_priv,
intel_aux_power_domain(intel_dig_port));
}
static void edp_panel_vdd_work(struct work_struct *__work)
{
struct intel_dp *intel_dp =
container_of(to_delayed_work(__work),
struct intel_dp, panel_vdd_work);
intel_wakeref_t wakeref;
with_pps_lock(intel_dp, wakeref) {
if (!intel_dp->want_panel_vdd)
edp_panel_vdd_off_sync(intel_dp);
}
}
static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
{
unsigned long delay;
/*
* Queue the timer to fire a long time from now (relative to the power
* down delay) to keep the panel power up across a sequence of
* operations.
*/
delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
}
/*
* Must be paired with edp_panel_vdd_on().
* Must hold pps_mutex around the whole on/off sequence.
* Can be nested with intel_edp_panel_vdd_{on,off}() calls.
*/
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
lockdep_assert_held(&dev_priv->pps_mutex);
if (!intel_dp_is_edp(intel_dp))
return;
I915_STATE_WARN(!intel_dp->want_panel_vdd, "eDP port %c VDD not forced on",
port_name(dp_to_dig_port(intel_dp)->base.port));
intel_dp->want_panel_vdd = false;
if (sync)
edp_panel_vdd_off_sync(intel_dp);
else
edp_panel_vdd_schedule_off(intel_dp);
}
static void edp_panel_on(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
u32 pp;
i915_reg_t pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
if (!intel_dp_is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP port %c panel power on\n",
port_name(dp_to_dig_port(intel_dp)->base.port));
if (WARN(edp_have_panel_power(intel_dp),
"eDP port %c panel power already on\n",
port_name(dp_to_dig_port(intel_dp)->base.port)))
return;
wait_panel_power_cycle(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
if (IS_GEN(dev_priv, 5)) {
/* ILK workaround: disable reset around power sequence */
pp &= ~PANEL_POWER_RESET;
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
}
pp |= PANEL_POWER_ON;
if (!IS_GEN(dev_priv, 5))
pp |= PANEL_POWER_RESET;
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
wait_panel_on(intel_dp);
intel_dp->last_power_on = jiffies;
if (IS_GEN(dev_priv, 5)) {
pp |= PANEL_POWER_RESET; /* restore panel reset bit */
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
}
}
void intel_edp_panel_on(struct intel_dp *intel_dp)
{
intel_wakeref_t wakeref;
if (!intel_dp_is_edp(intel_dp))
return;
with_pps_lock(intel_dp, wakeref)
edp_panel_on(intel_dp);
}
static void edp_panel_off(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
u32 pp;
i915_reg_t pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
if (!intel_dp_is_edp(intel_dp))
return;