// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>

#include "tidss_crtc.h"
#include "tidss_dispc.h"
#include "tidss_drv.h"
#include "tidss_plane.h"

/* drm_plane_helper_funcs */

static int tidss_plane_atomic_check(struct drm_plane *plane,
				    struct drm_plane_state *state)
{
	struct drm_device *ddev = plane->dev;
	struct tidss_device *tidss = to_tidss(ddev);
	struct tidss_plane *tplane = to_tidss_plane(plane);
	const struct drm_format_info *finfo;
	struct drm_crtc_state *crtc_state;
	u32 hw_plane = tplane->hw_plane_id;
	u32 hw_videoport;
	int ret;

	dev_dbg(ddev->dev, "%s\n", __func__);

	if (!state->crtc) {
		/*
		 * The visible field is not reset by the DRM core but only
		 * updated by drm_plane_helper_check_state(), set it manually.
		 */
		state->visible = false;
		return 0;
	}

	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
	if (IS_ERR(crtc_state))
		return PTR_ERR(crtc_state);

	ret = drm_atomic_helper_check_plane_state(state, crtc_state, 0,
						  INT_MAX, true, true);
	if (ret < 0)
		return ret;

	/*
	 * The HW is only able to start drawing at subpixel boundary
	 * (the two first checks bellow). At the end of a row the HW
	 * can only jump integer number of subpixels forward to the
	 * beginning of the next row. So we can only show picture with
	 * integer subpixel width (the third check). However, after
	 * reaching the end of the drawn picture the drawing starts
	 * again at the absolute memory address where top left corner
	 * position of the drawn picture is (so there is no need to
	 * check for odd height).
	 */

	finfo = drm_format_info(state->fb->format->format);

	if ((state->src_x >> 16) % finfo->hsub != 0) {
		dev_dbg(ddev->dev,
			"%s: x-position %u not divisible subpixel size %u\n",
			__func__, (state->src_x >> 16), finfo->hsub);
		return -EINVAL;
	}

	if ((state->src_y >> 16) % finfo->vsub != 0) {
		dev_dbg(ddev->dev,
			"%s: y-position %u not divisible subpixel size %u\n",
			__func__, (state->src_y >> 16), finfo->vsub);
		return -EINVAL;
	}

	if ((state->src_w >> 16) % finfo->hsub != 0) {
		dev_dbg(ddev->dev,
			"%s: src width %u not divisible by subpixel size %u\n",
			 __func__, (state->src_w >> 16), finfo->hsub);
		return -EINVAL;
	}

	if (!state->visible)
		return 0;

	hw_videoport = to_tidss_crtc(state->crtc)->hw_videoport;

	ret = dispc_plane_check(tidss->dispc, hw_plane, state, hw_videoport);
	if (ret)
		return ret;

	return 0;
}

static void tidss_plane_atomic_update(struct drm_plane *plane,
				      struct drm_plane_state *old_state)
{
	struct drm_device *ddev = plane->dev;
	struct tidss_device *tidss = to_tidss(ddev);
	struct tidss_plane *tplane = to_tidss_plane(plane);
	struct drm_plane_state *state = plane->state;
	u32 hw_videoport;
	int ret;

	dev_dbg(ddev->dev, "%s\n", __func__);

	if (!state->visible) {
		dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
		return;
	}

	hw_videoport = to_tidss_crtc(state->crtc)->hw_videoport;

	ret = dispc_plane_setup(tidss->dispc, tplane->hw_plane_id,
				state, hw_videoport);

	if (ret) {
		dev_err(plane->dev->dev, "%s: Failed to setup plane %d\n",
			__func__, tplane->hw_plane_id);
		dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
		return;
	}

	dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, true);
}

static void tidss_plane_atomic_disable(struct drm_plane *plane,
				       struct drm_plane_state *old_state)
{
	struct drm_device *ddev = plane->dev;
	struct tidss_device *tidss = to_tidss(ddev);
	struct tidss_plane *tplane = to_tidss_plane(plane);

	dev_dbg(ddev->dev, "%s\n", __func__);

	dispc_plane_enable(tidss->dispc, tplane->hw_plane_id, false);
}

static void drm_plane_destroy(struct drm_plane *plane)
{
	struct tidss_plane *tplane = to_tidss_plane(plane);

	drm_plane_cleanup(plane);
	kfree(tplane);
}

static const struct drm_plane_helper_funcs tidss_plane_helper_funcs = {
	.prepare_fb = drm_gem_fb_prepare_fb,
	.atomic_check = tidss_plane_atomic_check,
	.atomic_update = tidss_plane_atomic_update,
	.atomic_disable = tidss_plane_atomic_disable,
};

static const struct drm_plane_funcs tidss_plane_funcs = {
	.update_plane = drm_atomic_helper_update_plane,
	.disable_plane = drm_atomic_helper_disable_plane,
	.reset = drm_atomic_helper_plane_reset,
	.destroy = drm_plane_destroy,
	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};

struct tidss_plane *tidss_plane_create(struct tidss_device *tidss,
				       u32 hw_plane_id, u32 plane_type,
				       u32 crtc_mask, const u32 *formats,
				       u32 num_formats)
{
	struct tidss_plane *tplane;
	enum drm_plane_type type;
	u32 possible_crtcs;
	u32 num_planes = tidss->feat->num_planes;
	u32 color_encodings = (BIT(DRM_COLOR_YCBCR_BT601) |
			       BIT(DRM_COLOR_YCBCR_BT709));
	u32 color_ranges = (BIT(DRM_COLOR_YCBCR_FULL_RANGE) |
			    BIT(DRM_COLOR_YCBCR_LIMITED_RANGE));
	u32 default_encoding = DRM_COLOR_YCBCR_BT601;
	u32 default_range = DRM_COLOR_YCBCR_FULL_RANGE;
	u32 blend_modes = (BIT(DRM_MODE_BLEND_PREMULTI) |
			   BIT(DRM_MODE_BLEND_COVERAGE));
	int ret;

	tplane = kzalloc(sizeof(*tplane), GFP_KERNEL);
	if (!tplane)
		return ERR_PTR(-ENOMEM);

	tplane->hw_plane_id = hw_plane_id;

	possible_crtcs = crtc_mask;
	type = plane_type;

	ret = drm_universal_plane_init(&tidss->ddev, &tplane->plane,
				       possible_crtcs,
				       &tidss_plane_funcs,
				       formats, num_formats,
				       NULL, type, NULL);
	if (ret < 0)
		goto err;

	drm_plane_helper_add(&tplane->plane, &tidss_plane_helper_funcs);

	drm_plane_create_zpos_property(&tplane->plane, hw_plane_id, 0,
				       num_planes - 1);

	ret = drm_plane_create_color_properties(&tplane->plane,
						color_encodings,
						color_ranges,
						default_encoding,
						default_range);
	if (ret)
		goto err;

	ret = drm_plane_create_alpha_property(&tplane->plane);
	if (ret)
		goto err;

	ret = drm_plane_create_blend_mode_property(&tplane->plane, blend_modes);
	if (ret)
		goto err;

	return tplane;

err:
	kfree(tplane);
	return ERR_PTR(ret);
}