drivers/gpu/drm/omapdrm/omap_connector.c - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
  * Author: Rob Clark <rob@ti.com>
  */

 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_probe_helper.h>

 #include "omap_drv.h"

 /*
  * connector funcs
  */

 #define to_omap_connector(x) container_of(x, struct omap_connector, base)

 struct omap_connector {
 	struct drm_connector base;
 	struct omap_dss_device *output;
 	struct omap_dss_device *hpd;
 	bool hdmi_mode;
 };

 static void omap_connector_hpd_notify(struct drm_connector *connector,
 				      enum drm_connector_status status)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev;

 	if (status != connector_status_disconnected)
 		return;

 	/*
 	 * Notify all devics in the pipeline of disconnection. This is required
 	 * to let the HDMI encoders reset their internal state related to
 	 * connection status, such as the CEC address.
 	 */
 	for (dssdev = omap_connector->output; dssdev; dssdev = dssdev->next) {
 		if (dssdev->ops && dssdev->ops->hdmi.lost_hotplug)
 			dssdev->ops->hdmi.lost_hotplug(dssdev);
 	}
 }

 static void omap_connector_hpd_cb(void *cb_data,
 				  enum drm_connector_status status)
 {
 	struct omap_connector *omap_connector = cb_data;
 	struct drm_connector *connector = &omap_connector->base;
 	struct drm_device *dev = connector->dev;
 	enum drm_connector_status old_status;

 	mutex_lock(&dev->mode_config.mutex);
 	old_status = connector->status;
 	connector->status = status;
 	mutex_unlock(&dev->mode_config.mutex);

 	if (old_status == status)
 		return;

 	omap_connector_hpd_notify(connector, status);

 	drm_kms_helper_hotplug_event(dev);
 }

 void omap_connector_enable_hpd(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *hpd = omap_connector->hpd;

 	if (hpd)
 		hpd->ops->register_hpd_cb(hpd, omap_connector_hpd_cb,
 					  omap_connector);
 }

 void omap_connector_disable_hpd(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *hpd = omap_connector->hpd;

 	if (hpd)
 		hpd->ops->unregister_hpd_cb(hpd);
 }

 bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);

 	return omap_connector->hdmi_mode;
 }

 static struct omap_dss_device *
 omap_connector_find_device(struct drm_connector *connector,
 			   enum omap_dss_device_ops_flag op)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev = NULL;
 	struct omap_dss_device *d;

 	for (d = omap_connector->output; d; d = d->next) {
 		if (d->ops_flags & op)
 			dssdev = d;
 	}

 	return dssdev;
 }

 static enum drm_connector_status omap_connector_detect(
 		struct drm_connector *connector, bool force)
 {
 	struct omap_dss_device *dssdev;
 	enum drm_connector_status status;

 	dssdev = omap_connector_find_device(connector,
 					    OMAP_DSS_DEVICE_OP_DETECT);

 	if (dssdev) {
 		status = dssdev->ops->detect(dssdev)
 		       ? connector_status_connected
 		       : connector_status_disconnected;

 		omap_connector_hpd_notify(connector, status);
 	} else {
 		switch (connector->connector_type) {
 		case DRM_MODE_CONNECTOR_DPI:
 		case DRM_MODE_CONNECTOR_LVDS:
 		case DRM_MODE_CONNECTOR_DSI:
 			status = connector_status_connected;
 			break;
 		default:
 			status = connector_status_unknown;
 			break;
 		}
 	}

 	VERB("%s: %d (force=%d)", connector->name, status, force);

 	return status;
 }

 static void omap_connector_destroy(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);

 	DBG("%s", connector->name);

 	if (omap_connector->hpd) {
 		struct omap_dss_device *hpd = omap_connector->hpd;

 		hpd->ops->unregister_hpd_cb(hpd);
 		omapdss_device_put(hpd);
 		omap_connector->hpd = NULL;
 	}

 	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);

 	omapdss_device_put(omap_connector->output);

 	kfree(omap_connector);
 }

 #define MAX_EDID  512

 static int omap_connector_get_modes_edid(struct drm_connector *connector,
 					 struct omap_dss_device *dssdev)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	enum drm_connector_status status;
 	void *edid;
 	int n;

 	status = omap_connector_detect(connector, false);
 	if (status != connector_status_connected)
 		goto no_edid;

 	edid = kzalloc(MAX_EDID, GFP_KERNEL);
 	if (!edid)
 		goto no_edid;

 	if (dssdev->ops->read_edid(dssdev, edid, MAX_EDID) <= 0 ||
 	    !drm_edid_is_valid(edid)) {
 		kfree(edid);
 		goto no_edid;
 	}

 	drm_connector_update_edid_property(connector, edid);
 	n = drm_add_edid_modes(connector, edid);

 	omap_connector->hdmi_mode = drm_detect_hdmi_monitor(edid);

 	kfree(edid);
 	return n;

 no_edid:
 	drm_connector_update_edid_property(connector, NULL);
 	return 0;
 }

 static int omap_connector_get_modes(struct drm_connector *connector)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct omap_dss_device *dssdev;

 	DBG("%s", connector->name);

 	/*
 	 * If display exposes EDID, then we parse that in the normal way to
 	 * build table of supported modes.
 	 */
 	dssdev = omap_connector_find_device(connector,
 					    OMAP_DSS_DEVICE_OP_EDID);
 	if (dssdev)
 		return omap_connector_get_modes_edid(connector, dssdev);

 	/*
 	 * Otherwise if the display pipeline reports modes (e.g. with a fixed
 	 * resolution panel or an analog TV output), query it.
 	 */
 	dssdev = omap_connector_find_device(connector,
 					    OMAP_DSS_DEVICE_OP_MODES);
 	if (dssdev)
 		return dssdev->ops->get_modes(dssdev, connector);

 	/*
 	 * Otherwise if the display pipeline uses a drm_panel, we delegate the
 	 * operation to the panel API.
 	 */
 	if (omap_connector->output->panel)
 		return drm_panel_get_modes(omap_connector->output->panel,
 					   connector);

 	/*
 	 * We can't retrieve modes, which can happen for instance for a DVI or
 	 * VGA output with the DDC bus unconnected. The KMS core will add the
 	 * default modes.
 	 */
 	return 0;
 }

 enum drm_mode_status omap_connector_mode_fixup(struct omap_dss_device *dssdev,
 					const struct drm_display_mode *mode,
 					struct drm_display_mode *adjusted_mode)
 {
 	int ret;

 	drm_mode_copy(adjusted_mode, mode);

 	for (; dssdev; dssdev = dssdev->next) {
 		if (!dssdev->ops->check_timings)
 			continue;

 		ret = dssdev->ops->check_timings(dssdev, adjusted_mode);
 		if (ret)
 			return MODE_BAD;
 	}

 	return MODE_OK;
 }

 static enum drm_mode_status omap_connector_mode_valid(struct drm_connector *connector,
 				 struct drm_display_mode *mode)
 {
 	struct omap_connector *omap_connector = to_omap_connector(connector);
 	struct drm_display_mode new_mode = { { 0 } };
 	enum drm_mode_status status;

 	status = omap_connector_mode_fixup(omap_connector->output, mode,
 					   &new_mode);
 	if (status != MODE_OK)
 		goto done;

 	/* Check if vrefresh is still valid. */
 	if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(&new_mode))
 		status = MODE_NOCLOCK;

 done:
 	DBG("connector: mode %s: " DRM_MODE_FMT,
 			(status == MODE_OK) ? "valid" : "invalid",
 			DRM_MODE_ARG(mode));

 	return status;
 }

 static const struct drm_connector_funcs omap_connector_funcs = {
 	.reset = drm_atomic_helper_connector_reset,
 	.detect = omap_connector_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = omap_connector_destroy,
 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

 static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
 	.get_modes = omap_connector_get_modes,
 	.mode_valid = omap_connector_mode_valid,
 };

 static int omap_connector_get_type(struct omap_dss_device *output)
 {
 	struct omap_dss_device *display;
 	enum omap_display_type type;

 	display = omapdss_display_get(output);
 	type = display->type;
 	omapdss_device_put(display);

 	switch (type) {
 	case OMAP_DISPLAY_TYPE_HDMI:
 		return DRM_MODE_CONNECTOR_HDMIA;
 	case OMAP_DISPLAY_TYPE_DVI:
 		return DRM_MODE_CONNECTOR_DVID;
 	case OMAP_DISPLAY_TYPE_DSI:
 		return DRM_MODE_CONNECTOR_DSI;
 	case OMAP_DISPLAY_TYPE_DPI:
 	case OMAP_DISPLAY_TYPE_DBI:
 		return DRM_MODE_CONNECTOR_DPI;
 	case OMAP_DISPLAY_TYPE_VENC:
 		/* TODO: This could also be composite */
 		return DRM_MODE_CONNECTOR_SVIDEO;
 	case OMAP_DISPLAY_TYPE_SDI:
 		return DRM_MODE_CONNECTOR_LVDS;
 	default:
 		return DRM_MODE_CONNECTOR_Unknown;
 	}
 }

 /* initialize connector */
 struct drm_connector *omap_connector_init(struct drm_device *dev,
 					  struct omap_dss_device *output,
 					  struct drm_encoder *encoder)
 {
 	struct drm_connector *connector = NULL;
 	struct omap_connector *omap_connector;
 	struct omap_dss_device *dssdev;

 	DBG("%s", output->name);

 	omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
 	if (!omap_connector)
 		goto fail;

 	omap_connector->output = omapdss_device_get(output);

 	connector = &omap_connector->base;
 	connector->interlace_allowed = 1;
 	connector->doublescan_allowed = 0;

 	drm_connector_init(dev, connector, &omap_connector_funcs,
 			   omap_connector_get_type(output));
 	drm_connector_helper_add(connector, &omap_connector_helper_funcs);

 	/*
 	 * Initialize connector status handling. First try to find a device that
 	 * supports hot-plug reporting. If it fails, fall back to a device that
 	 * support polling. If that fails too, we don't support hot-plug
 	 * detection at all.
 	 */
 	dssdev = omap_connector_find_device(connector, OMAP_DSS_DEVICE_OP_HPD);
 	if (dssdev) {
 		omap_connector->hpd = omapdss_device_get(dssdev);
 		connector->polled = DRM_CONNECTOR_POLL_HPD;
 	} else {
 		dssdev = omap_connector_find_device(connector,
 						    OMAP_DSS_DEVICE_OP_DETECT);
 		if (dssdev)
 			connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 					    DRM_CONNECTOR_POLL_DISCONNECT;
 	}

 	return connector;

 fail:
 	if (connector)
 		omap_connector_destroy(connector);

 	return NULL;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
	* Author: Rob Clark <rob@ti.com>
	*/

	#include <drm/drm_atomic_helper.h>
	#include <drm/drm_crtc.h>
	#include <drm/drm_panel.h>
	#include <drm/drm_probe_helper.h>

	#include "omap_drv.h"

	/*
	* connector funcs
	*/

	#define to_omap_connector(x) container_of(x, struct omap_connector, base)

	struct omap_connector {
	struct drm_connector base;
	struct omap_dss_device *output;
	struct omap_dss_device *hpd;
	bool hdmi_mode;
	};

	static void omap_connector_hpd_notify(struct drm_connector *connector,
	enum drm_connector_status status)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev;

	if (status != connector_status_disconnected)
	return;

	/*
	* Notify all devics in the pipeline of disconnection. This is required
	* to let the HDMI encoders reset their internal state related to
	* connection status, such as the CEC address.
	*/
	for (dssdev = omap_connector->output; dssdev; dssdev = dssdev->next) {
	if (dssdev->ops && dssdev->ops->hdmi.lost_hotplug)
	dssdev->ops->hdmi.lost_hotplug(dssdev);
	}
	}

	static void omap_connector_hpd_cb(void *cb_data,
	enum drm_connector_status status)
	{
	struct omap_connector *omap_connector = cb_data;
	struct drm_connector *connector = &omap_connector->base;
	struct drm_device *dev = connector->dev;
	enum drm_connector_status old_status;

	mutex_lock(&dev->mode_config.mutex);
	old_status = connector->status;
	connector->status = status;
	mutex_unlock(&dev->mode_config.mutex);

	if (old_status == status)
	return;

	omap_connector_hpd_notify(connector, status);

	drm_kms_helper_hotplug_event(dev);
	}

	void omap_connector_enable_hpd(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *hpd = omap_connector->hpd;

	if (hpd)
	hpd->ops->register_hpd_cb(hpd, omap_connector_hpd_cb,
	omap_connector);
	}

	void omap_connector_disable_hpd(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *hpd = omap_connector->hpd;

	if (hpd)
	hpd->ops->unregister_hpd_cb(hpd);
	}

	bool omap_connector_get_hdmi_mode(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);

	return omap_connector->hdmi_mode;
	}

	static struct omap_dss_device *
	omap_connector_find_device(struct drm_connector *connector,
	enum omap_dss_device_ops_flag op)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev = NULL;
	struct omap_dss_device *d;

	for (d = omap_connector->output; d; d = d->next) {
	if (d->ops_flags & op)
	dssdev = d;
	}

	return dssdev;
	}

	static enum drm_connector_status omap_connector_detect(
	struct drm_connector *connector, bool force)
	{
	struct omap_dss_device *dssdev;
	enum drm_connector_status status;

	dssdev = omap_connector_find_device(connector,
	OMAP_DSS_DEVICE_OP_DETECT);

	if (dssdev) {
	status = dssdev->ops->detect(dssdev)
	? connector_status_connected
	: connector_status_disconnected;

	omap_connector_hpd_notify(connector, status);
	} else {
	switch (connector->connector_type) {
	case DRM_MODE_CONNECTOR_DPI:
	case DRM_MODE_CONNECTOR_LVDS:
	case DRM_MODE_CONNECTOR_DSI:
	status = connector_status_connected;
	break;
	default:
	status = connector_status_unknown;
	break;
	}
	}

	VERB("%s: %d (force=%d)", connector->name, status, force);

	return status;
	}

	static void omap_connector_destroy(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);

	DBG("%s", connector->name);

	if (omap_connector->hpd) {
	struct omap_dss_device *hpd = omap_connector->hpd;

	hpd->ops->unregister_hpd_cb(hpd);
	omapdss_device_put(hpd);
	omap_connector->hpd = NULL;
	}

	drm_connector_unregister(connector);
	drm_connector_cleanup(connector);

	omapdss_device_put(omap_connector->output);

	kfree(omap_connector);
	}

	#define MAX_EDID 512

	static int omap_connector_get_modes_edid(struct drm_connector *connector,
	struct omap_dss_device *dssdev)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	enum drm_connector_status status;
	void *edid;
	int n;

	status = omap_connector_detect(connector, false);
	if (status != connector_status_connected)
	goto no_edid;

	edid = kzalloc(MAX_EDID, GFP_KERNEL);
	if (!edid)
	goto no_edid;

	if (dssdev->ops->read_edid(dssdev, edid, MAX_EDID) <= 0 \|\|
	!drm_edid_is_valid(edid)) {
	kfree(edid);
	goto no_edid;
	}

	drm_connector_update_edid_property(connector, edid);
	n = drm_add_edid_modes(connector, edid);

	omap_connector->hdmi_mode = drm_detect_hdmi_monitor(edid);

	kfree(edid);
	return n;

	no_edid:
	drm_connector_update_edid_property(connector, NULL);
	return 0;
	}

	static int omap_connector_get_modes(struct drm_connector *connector)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct omap_dss_device *dssdev;

	DBG("%s", connector->name);

	/*
	* If display exposes EDID, then we parse that in the normal way to
	* build table of supported modes.
	*/
	dssdev = omap_connector_find_device(connector,
	OMAP_DSS_DEVICE_OP_EDID);
	if (dssdev)
	return omap_connector_get_modes_edid(connector, dssdev);

	/*
	* Otherwise if the display pipeline reports modes (e.g. with a fixed
	* resolution panel or an analog TV output), query it.
	*/
	dssdev = omap_connector_find_device(connector,
	OMAP_DSS_DEVICE_OP_MODES);
	if (dssdev)
	return dssdev->ops->get_modes(dssdev, connector);

	/*
	* Otherwise if the display pipeline uses a drm_panel, we delegate the
	* operation to the panel API.
	*/
	if (omap_connector->output->panel)
	return drm_panel_get_modes(omap_connector->output->panel,
	connector);

	/*
	* We can't retrieve modes, which can happen for instance for a DVI or
	* VGA output with the DDC bus unconnected. The KMS core will add the
	* default modes.
	*/
	return 0;
	}

	enum drm_mode_status omap_connector_mode_fixup(struct omap_dss_device *dssdev,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	int ret;

	drm_mode_copy(adjusted_mode, mode);

	for (; dssdev; dssdev = dssdev->next) {
	if (!dssdev->ops->check_timings)
	continue;

	ret = dssdev->ops->check_timings(dssdev, adjusted_mode);
	if (ret)
	return MODE_BAD;
	}

	return MODE_OK;
	}

	static enum drm_mode_status omap_connector_mode_valid(struct drm_connector *connector,
	struct drm_display_mode *mode)
	{
	struct omap_connector *omap_connector = to_omap_connector(connector);
	struct drm_display_mode new_mode = { { 0 } };
	enum drm_mode_status status;

	status = omap_connector_mode_fixup(omap_connector->output, mode,
	&new_mode);
	if (status != MODE_OK)
	goto done;

	/* Check if vrefresh is still valid. */
	if (drm_mode_vrefresh(mode) != drm_mode_vrefresh(&new_mode))
	status = MODE_NOCLOCK;

	done:
	DBG("connector: mode %s: " DRM_MODE_FMT,
	(status == MODE_OK) ? "valid" : "invalid",
	DRM_MODE_ARG(mode));

	return status;
	}

	static const struct drm_connector_funcs omap_connector_funcs = {
	.reset = drm_atomic_helper_connector_reset,
	.detect = omap_connector_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = omap_connector_destroy,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	};

	static const struct drm_connector_helper_funcs omap_connector_helper_funcs = {
	.get_modes = omap_connector_get_modes,
	.mode_valid = omap_connector_mode_valid,
	};

	static int omap_connector_get_type(struct omap_dss_device *output)
	{
	struct omap_dss_device *display;
	enum omap_display_type type;

	display = omapdss_display_get(output);
	type = display->type;
	omapdss_device_put(display);

	switch (type) {
	case OMAP_DISPLAY_TYPE_HDMI:
	return DRM_MODE_CONNECTOR_HDMIA;
	case OMAP_DISPLAY_TYPE_DVI:
	return DRM_MODE_CONNECTOR_DVID;
	case OMAP_DISPLAY_TYPE_DSI:
	return DRM_MODE_CONNECTOR_DSI;
	case OMAP_DISPLAY_TYPE_DPI:
	case OMAP_DISPLAY_TYPE_DBI:
	return DRM_MODE_CONNECTOR_DPI;
	case OMAP_DISPLAY_TYPE_VENC:
	/* TODO: This could also be composite */
	return DRM_MODE_CONNECTOR_SVIDEO;
	case OMAP_DISPLAY_TYPE_SDI:
	return DRM_MODE_CONNECTOR_LVDS;
	default:
	return DRM_MODE_CONNECTOR_Unknown;
	}
	}

	/* initialize connector */
	struct drm_connector omap_connector_init(struct drm_device dev,
	struct omap_dss_device *output,
	struct drm_encoder *encoder)
	{
	struct drm_connector *connector = NULL;
	struct omap_connector *omap_connector;
	struct omap_dss_device *dssdev;

	DBG("%s", output->name);

	omap_connector = kzalloc(sizeof(*omap_connector), GFP_KERNEL);
	if (!omap_connector)
	goto fail;

	omap_connector->output = omapdss_device_get(output);

	connector = &omap_connector->base;
	connector->interlace_allowed = 1;
	connector->doublescan_allowed = 0;

	drm_connector_init(dev, connector, &omap_connector_funcs,
	omap_connector_get_type(output));
	drm_connector_helper_add(connector, &omap_connector_helper_funcs);

	/*
	* Initialize connector status handling. First try to find a device that
	* supports hot-plug reporting. If it fails, fall back to a device that
	* support polling. If that fails too, we don't support hot-plug
	* detection at all.
	*/
	dssdev = omap_connector_find_device(connector, OMAP_DSS_DEVICE_OP_HPD);
	if (dssdev) {
	omap_connector->hpd = omapdss_device_get(dssdev);
	connector->polled = DRM_CONNECTOR_POLL_HPD;
	} else {
	dssdev = omap_connector_find_device(connector,
	OMAP_DSS_DEVICE_OP_DETECT);
	if (dssdev)
	connector->polled = DRM_CONNECTOR_POLL_CONNECT \|
	DRM_CONNECTOR_POLL_DISCONNECT;
	}

	return connector;

	fail:
	if (connector)
	omap_connector_destroy(connector);

	return NULL;
	}