Re: [PATCH v2 06/15] drm/i915/tgl: Gen-12 render decompression

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On Wed, 2019-12-18 at 19:07 +0200, Imre Deak wrote:
> From: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> 
> Gen-12 display decompression operates on Y-tiled compressed main
> surface.
> The CCS is linear and has 4 bits of metadata for each main surface
> cache
> line pair, a size ratio of 1:256. Gen-12 display decompression is
> incompatible with buffers compressed by earlier GPUs, so make use of
> a new
> modifier to identify gen-12 compression. Another notable change is
> that
> render decompression is supported on all planes except cursor and on
> all
> pipes. Start by adding render decompression support for [A,X]BGR888
> pixel
> formats.
> 
> v2: Fix checkpatch warnings (Lucas)
> v3:
> Rebase, disable color clear, styling changes and modify
> intel_tile_width_bytes and intel_tile_height to handle linear CCS
> v4:
> - Use format block descriptors and the i915 specific func to get the
>   subsampling for each color plane.
> - Use helpers to convert between CCS and main planes.
> v5:
> - Fix subsampling returned by intel_fb_plane_get_subsampling() for
>   the CCS plane of the first plane.
> 
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> Cc: Nanley G Chery <nanley.g.chery@xxxxxxxxx>
> Cc: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
r-b for the correct version of the patch
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>

> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 185 +++++++++++++++
> ----
>  drivers/gpu/drm/i915/display/intel_sprite.c  |  23 ++-
>  drivers/gpu/drm/i915/i915_reg.h              |   1 +
>  3 files changed, 169 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 6bda397ae677..c9a92d62a70f 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -1941,6 +1941,16 @@ static bool is_ccs_plane(const struct
> drm_framebuffer *fb, int plane)
>  	return plane >= fb->format->num_planes / 2;
>  }
>  
> +static bool is_gen12_ccs_modifier(u64 modifier)
> +{
> +	return modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS;
> +}
> +
> +static bool is_gen12_ccs_plane(const struct drm_framebuffer *fb, int
> plane)
> +{
> +	return is_gen12_ccs_modifier(fb->modifier) && is_ccs_plane(fb,
> plane);
> +}
> +
>  static bool is_aux_plane(const struct drm_framebuffer *fb, int
> plane)
>  {
>  	if (is_ccs_modifier(fb->modifier))
> @@ -1957,6 +1967,14 @@ static int main_to_ccs_plane(const struct
> drm_framebuffer *fb, int main_plane)
>  	return fb->format->num_planes / 2 + main_plane;
>  }
>  
> +static int ccs_to_main_plane(const struct drm_framebuffer *fb, int
> ccs_plane)
> +{
> +	WARN_ON(!is_ccs_modifier(fb->modifier) ||
> +		ccs_plane < fb->format->num_planes / 2);
> +
> +	return ccs_plane - fb->format->num_planes / 2;
> +}
> +
>  /* Return either the main plane's CCS or - if not a CCS FB - UV
> plane */
>  static int
>  intel_main_to_aux_plane(const struct drm_framebuffer *fb, int
> main_plane)
> @@ -1985,6 +2003,10 @@ intel_tile_width_bytes(const struct
> drm_framebuffer *fb, int color_plane)
>  		if (is_ccs_plane(fb, color_plane))
>  			return 128;
>  		/* fall through */
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
> +		if (is_ccs_plane(fb, color_plane))
> +			return 64;
> +		/* fall through */
>  	case I915_FORMAT_MOD_Y_TILED:
>  		if (IS_GEN(dev_priv, 2) ||
> HAS_128_BYTE_Y_TILING(dev_priv))
>  			return 128;
> @@ -2018,6 +2040,9 @@ intel_tile_width_bytes(const struct
> drm_framebuffer *fb, int color_plane)
>  static unsigned int
>  intel_tile_height(const struct drm_framebuffer *fb, int color_plane)
>  {
> +	if (is_gen12_ccs_plane(fb, color_plane))
> +		return 1;
> +
>  	return intel_tile_size(to_i915(fb->dev)) /
>  		intel_tile_width_bytes(fb, color_plane);
>  }
> @@ -2118,6 +2143,8 @@ static unsigned int intel_surf_alignment(const
> struct drm_framebuffer *fb,
>  		if (INTEL_GEN(dev_priv) >= 9)
>  			return 256 * 1024;
>  		return 0;
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
> +		return 16 * 1024;
>  	case I915_FORMAT_MOD_Y_TILED_CCS:
>  	case I915_FORMAT_MOD_Yf_TILED_CCS:
>  	case I915_FORMAT_MOD_Y_TILED:
> @@ -2310,9 +2337,10 @@ static u32 intel_adjust_tile_offset(int *x,
> int *y,
>  	return new_offset;
>  }
>  
> -static bool is_surface_linear(u64 modifier, int color_plane)
> +static bool is_surface_linear(const struct drm_framebuffer *fb, int
> color_plane)
>  {
> -	return modifier == DRM_FORMAT_MOD_LINEAR;
> +	return fb->modifier == DRM_FORMAT_MOD_LINEAR ||
> +	       is_gen12_ccs_plane(fb, color_plane);
>  }
>  
>  static u32 intel_adjust_aligned_offset(int *x, int *y,
> @@ -2327,7 +2355,7 @@ static u32 intel_adjust_aligned_offset(int *x,
> int *y,
>  
>  	WARN_ON(new_offset > old_offset);
>  
> -	if (!is_surface_linear(fb->modifier, color_plane)) {
> +	if (!is_surface_linear(fb, color_plane)) {
>  		unsigned int tile_size, tile_width, tile_height;
>  		unsigned int pitch_tiles;
>  
> @@ -2397,7 +2425,7 @@ static u32 intel_compute_aligned_offset(struct
> drm_i915_private *dev_priv,
>  	if (alignment)
>  		alignment--;
>  
> -	if (!is_surface_linear(fb->modifier, color_plane)) {
> +	if (!is_surface_linear(fb, color_plane)) {
>  		unsigned int tile_size, tile_width, tile_height;
>  		unsigned int tile_rows, tiles, pitch_tiles;
>  
> @@ -2499,6 +2527,7 @@ static unsigned int
> intel_fb_modifier_to_tiling(u64 fb_modifier)
>  		return I915_TILING_X;
>  	case I915_FORMAT_MOD_Y_TILED:
>  	case I915_FORMAT_MOD_Y_TILED_CCS:
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
>  		return I915_TILING_Y;
>  	default:
>  		return I915_TILING_NONE;
> @@ -2519,7 +2548,7 @@ static unsigned int
> intel_fb_modifier_to_tiling(u64 fb_modifier)
>   * us a ratio of one byte in the CCS for each 8x16 pixels in the
>   * main surface.
>   */
> -static const struct drm_format_info ccs_formats[] = {
> +static const struct drm_format_info skl_ccs_formats[] = {
>  	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
>  	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, },
>  	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
> @@ -2530,6 +2559,28 @@ static const struct drm_format_info
> ccs_formats[] = {
>  	  .cpp = { 4, 1, }, .hsub = 8, .vsub = 16, .has_alpha = true,
> },
>  };
>  
> +/*
> + * Gen-12 compression uses 4 bits of CCS data for each cache line
> pair in the
> + * main surface. And each 64B CCS cache line represents an area of
> 4x1 Y-tiles
> + * in the main surface. With 4 byte pixels and each Y-tile having
> dimensions of
> + * 32x32 pixels, the ratio turns out to 1B in the CCS for every 2x32
> pixels in
> + * the main surface.
> + */
> +static const struct drm_format_info gen12_ccs_formats[] = {
> +	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
> +	  .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = {
> 1, 1 },
> +	  .hsub = 1, .vsub = 1, },
> +	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
> +	  .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = {
> 1, 1 },
> +	  .hsub = 1, .vsub = 1, },
> +	{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
> +	  .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = {
> 1, 1 },
> +	  .hsub = 1, .vsub = 1, .has_alpha = true },
> +	{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
> +	  .char_per_block = { 4, 1 }, .block_w = { 1, 2 }, .block_h = {
> 1, 1 },
> +	  .hsub = 1, .vsub = 1, .has_alpha = true },
> +};
> +
>  static const struct drm_format_info *
>  lookup_format_info(const struct drm_format_info formats[],
>  		   int num_formats, u32 format)
> @@ -2550,8 +2601,12 @@ intel_get_format_info(const struct
> drm_mode_fb_cmd2 *cmd)
>  	switch (cmd->modifier[0]) {
>  	case I915_FORMAT_MOD_Y_TILED_CCS:
>  	case I915_FORMAT_MOD_Yf_TILED_CCS:
> -		return lookup_format_info(ccs_formats,
> -					  ARRAY_SIZE(ccs_formats),
> +		return lookup_format_info(skl_ccs_formats,
> +					  ARRAY_SIZE(skl_ccs_formats),
> +					  cmd->pixel_format);
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
> +		return lookup_format_info(gen12_ccs_formats,
> +					  ARRAY_SIZE(gen12_ccs_formats)
> ,
>  					  cmd->pixel_format);
>  	default:
>  		return NULL;
> @@ -2560,7 +2615,8 @@ intel_get_format_info(const struct
> drm_mode_fb_cmd2 *cmd)
>  
>  bool is_ccs_modifier(u64 modifier)
>  {
> -	return modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
> +	return modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS ||
> +	       modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
>  	       modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
>  }
>  
> @@ -2608,8 +2664,9 @@ static u32
>  intel_fb_stride_alignment(const struct drm_framebuffer *fb, int
> color_plane)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(fb->dev);
> +	u32 tile_width;
>  
> -	if (fb->modifier == DRM_FORMAT_MOD_LINEAR) {
> +	if (is_surface_linear(fb, color_plane)) {
>  		u32 max_stride = intel_plane_fb_max_stride(dev_priv,
>  							   fb->format-
> >format,
>  							   fb-
> >modifier);
> @@ -2618,13 +2675,14 @@ intel_fb_stride_alignment(const struct
> drm_framebuffer *fb, int color_plane)
>  		 * To make remapping with linear generally feasible
>  		 * we need the stride to be page aligned.
>  		 */
> -		if (fb->pitches[color_plane] > max_stride)
> +		if (fb->pitches[color_plane] > max_stride &&
> !is_ccs_modifier(fb->modifier))
>  			return intel_tile_size(dev_priv);
>  		else
>  			return 64;
> -	} else {
> -		u32 tile_width = intel_tile_width_bytes(fb,
> color_plane);
> +	}
>  
> +	tile_width = intel_tile_width_bytes(fb, color_plane);
> +	if (is_ccs_modifier(fb->modifier) && color_plane == 0) {
>  		/*
>  		 * Display WA #0531: skl,bxt,kbl,glk
>  		 *
> @@ -2634,12 +2692,16 @@ intel_fb_stride_alignment(const struct
> drm_framebuffer *fb, int color_plane)
>  		 * require the entire fb to accommodate that to avoid
>  		 * potential runtime errors at plane configuration
> time.
>  		 */
> -		if (IS_GEN(dev_priv, 9) && is_ccs_modifier(fb-
> >modifier) &&
> -		    color_plane == 0 && fb->width > 3840)
> +		if (IS_GEN(dev_priv, 9) && fb->width > 3840)
> +			tile_width *= 4;
> +		/*
> +		 * The main surface pitch must be padded to a multiple
> of four
> +		 * tile widths.
> +		 */
> +		else if (INTEL_GEN(dev_priv) >= 12)
>  			tile_width *= 4;
> -
> -		return tile_width;
>  	}
> +	return tile_width;
>  }
>  
>  bool intel_plane_can_remap(const struct intel_plane_state
> *plane_state)
> @@ -2710,25 +2772,74 @@ static bool intel_plane_needs_remap(const
> struct intel_plane_state *plane_state)
>  	return stride > max_stride;
>  }
>  
> +static void
> +intel_fb_plane_get_subsampling(int *hsub, int *vsub,
> +			       const struct drm_framebuffer *fb,
> +			       int color_plane)
> +{
> +	int main_plane;
> +
> +	if (color_plane == 0) {
> +		*hsub = 1;
> +		*vsub = 1;
> +
> +		return;
> +	}
> +
> +	/*
> +	 * TODO: Deduct the subsampling from the char block for all CCS
> +	 * formats and planes.
> +	 */
> +	if (!is_gen12_ccs_plane(fb, color_plane)) {
> +		*hsub = fb->format->hsub;
> +		*vsub = fb->format->vsub;
> +
> +		return;
> +	}
> +
> +	main_plane = ccs_to_main_plane(fb, color_plane);
> +	*hsub = drm_format_info_block_width(fb->format, color_plane) /
> +	        drm_format_info_block_width(fb->format, main_plane);
> +
> +	/*
> +	 * The min stride check in the core framebuffer_check()
> function
> +	 * assumes that format->hsub applies to every plane except for
> the
> +	 * first plane. That's incorrect for the CCS AUX plane of the
> first
> +	 * plane, but for the above check to pass we must define the
> block
> +	 * width with that subsampling applied to it. Adjust the width
> here
> +	 * accordingly, so we can calculate the actual subsampling
> factor.
> +	 */
> +	if (main_plane == 0)
> +		*hsub *= fb->format->hsub;
> +
> +	*vsub = 32;
> +}
>  static int
>  intel_fb_check_ccs_xy(struct drm_framebuffer *fb, int x, int y)
>  {
>  	struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
> -	int hsub = fb->format->hsub;
> -	int vsub = fb->format->vsub;
> +	int main_plane;
> +	int hsub, vsub;
>  	int tile_width, tile_height;
>  	int ccs_x, ccs_y;
>  	int main_x, main_y;
> +	int ccs_plane = 1;
>  
> -	intel_tile_dims(fb, 1, &tile_width, &tile_height);
> +	if (!is_ccs_plane(fb, ccs_plane))
> +		return 0;
> +
> +	intel_tile_dims(fb, ccs_plane, &tile_width, &tile_height);
> +	intel_fb_plane_get_subsampling(&hsub, &vsub, fb, ccs_plane);
>  
>  	tile_width *= hsub;
>  	tile_height *= vsub;
>  
>  	ccs_x = (x * hsub) % tile_width;
>  	ccs_y = (y * vsub) % tile_height;
> -	main_x = intel_fb->normal[0].x % tile_width;
> -	main_y = intel_fb->normal[0].y % tile_height;
> +
> +	main_plane = ccs_to_main_plane(fb, ccs_plane);
> +	main_x = intel_fb->normal[main_plane].x % tile_width;
> +	main_y = intel_fb->normal[main_plane].y % tile_height;
>  
>  	/*
>  	 * CCS doesn't have its own x/y offset register, so the intra
> CCS tile
> @@ -2738,8 +2849,8 @@ intel_fb_check_ccs_xy(struct drm_framebuffer
> *fb, int x, int y)
>  		DRM_DEBUG_KMS("Bad CCS x/y (main %d,%d ccs %d,%d) full
> (main %d,%d ccs %d,%d)\n",
>  			      main_x, main_y,
>  			      ccs_x, ccs_y,
> -			      intel_fb->normal[0].x,
> -			      intel_fb->normal[0].y,
> +			      intel_fb->normal[main_plane].x,
> +			      intel_fb->normal[main_plane].y,
>  			      x, y);
>  		return -EINVAL;
>  	}
> @@ -2810,7 +2921,7 @@ intel_fill_fb_info(struct drm_i915_private
> *dev_priv,
>  						      tile_size);
>  		offset /= tile_size;
>  
> -		if (!is_surface_linear(fb->modifier, i)) {
> +		if (!is_surface_linear(fb, i)) {
>  			unsigned int tile_width, tile_height;
>  			unsigned int pitch_tiles;
>  			struct drm_rect r;
> @@ -3489,14 +3600,15 @@ static bool
> skl_check_main_ccs_coordinates(struct intel_plane_state *plane_state
>  					   int main_x, int main_y, u32
> main_offset)
>  {
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
> -	int hsub = fb->format->hsub;
> -	int vsub = fb->format->vsub;
>  	int ccs_plane = main_to_ccs_plane(fb, 0);
>  	int aux_x = plane_state->color_plane[ccs_plane].x;
>  	int aux_y = plane_state->color_plane[ccs_plane].y;
>  	u32 aux_offset = plane_state->color_plane[ccs_plane].offset;
>  	u32 alignment = intel_surf_alignment(fb, ccs_plane);
> +	int hsub;
> +	int vsub;
>  
> +	intel_fb_plane_get_subsampling(&hsub, &vsub, fb, ccs_plane);
>  	while (aux_offset >= main_offset && aux_y <= main_y) {
>  		int x, y;
>  
> @@ -3657,12 +3769,15 @@ static int skl_check_ccs_aux_surface(struct
> intel_plane_state *plane_state)
>  	const struct drm_framebuffer *fb = plane_state->hw.fb;
>  	int src_x = plane_state->uapi.src.x1 >> 16;
>  	int src_y = plane_state->uapi.src.y1 >> 16;
> -	int hsub = fb->format->hsub;
> -	int vsub = fb->format->vsub;
> -	int x = src_x / hsub;
> -	int y = src_y / vsub;
> +	int hsub;
> +	int vsub;
> +	int x;
> +	int y;
>  	u32 offset;
>  
> +	intel_fb_plane_get_subsampling(&hsub, &vsub, fb, 1);
> +	x = src_x / hsub;
> +	y = src_y / vsub;
>  	intel_add_fb_offsets(&x, &y, plane_state, 1);
>  	offset = intel_plane_compute_aligned_offset(&x, &y,
> plane_state, 1);
>  
> @@ -4158,7 +4273,7 @@ static unsigned int skl_plane_stride_mult(const
> struct drm_framebuffer *fb,
>  	 * The stride is either expressed as a multiple of 64 bytes
> chunks for
>  	 * linear buffers or in number of tiles for tiled buffers.
>  	 */
> -	if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
> +	if (is_surface_linear(fb, color_plane))
>  		return 64;
>  	else if (drm_rotation_90_or_270(rotation))
>  		return intel_tile_height(fb, color_plane);
> @@ -4286,6 +4401,10 @@ static u32 skl_plane_ctl_tiling(u64
> fb_modifier)
>  		return PLANE_CTL_TILED_Y;
>  	case I915_FORMAT_MOD_Y_TILED_CCS:
>  		return PLANE_CTL_TILED_Y |
> PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
> +		return PLANE_CTL_TILED_Y |
> +		       PLANE_CTL_RENDER_DECOMPRESSION_ENABLE |
> +		       PLANE_CTL_CLEAR_COLOR_DISABLE;
>  	case I915_FORMAT_MOD_Yf_TILED:
>  		return PLANE_CTL_TILED_YF;
>  	case I915_FORMAT_MOD_Yf_TILED_CCS:
> @@ -10021,7 +10140,9 @@ skylake_get_initial_plane_config(struct
> intel_crtc *crtc,
>  	case PLANE_CTL_TILED_Y:
>  		plane_config->tiling = I915_TILING_Y;
>  		if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
> -			fb->modifier = I915_FORMAT_MOD_Y_TILED_CCS;
> +			fb->modifier = INTEL_GEN(dev_priv) >= 12 ?
> +				I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS :
> +				I915_FORMAT_MOD_Y_TILED_CCS;
>  		else
>  			fb->modifier = I915_FORMAT_MOD_Y_TILED;
>  		break;
> diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c
> b/drivers/gpu/drm/i915/display/intel_sprite.c
> index 8394502b092d..67a90059900f 100644
> --- a/drivers/gpu/drm/i915/display/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/display/intel_sprite.c
> @@ -583,6 +583,7 @@ skl_program_plane(struct intel_plane *plane,
>  	const struct drm_intel_sprite_colorkey *key = &plane_state-
> >ckey;
>  	u32 surf_addr = plane_state->color_plane[color_plane].offset;
>  	u32 stride = skl_plane_stride(plane_state, color_plane);
> +	u32 aux_dist = plane_state->color_plane[1].offset - surf_addr;
>  	u32 aux_stride = skl_plane_stride(plane_state, 1);
>  	int crtc_x = plane_state->uapi.dst.x1;
>  	int crtc_y = plane_state->uapi.dst.y1;
> @@ -624,8 +625,10 @@ skl_program_plane(struct intel_plane *plane,
>  	I915_WRITE_FW(PLANE_STRIDE(pipe, plane_id), stride);
>  	I915_WRITE_FW(PLANE_POS(pipe, plane_id), (crtc_y << 16) |
> crtc_x);
>  	I915_WRITE_FW(PLANE_SIZE(pipe, plane_id), (src_h << 16) |
> src_w);
> -	I915_WRITE_FW(PLANE_AUX_DIST(pipe, plane_id),
> -		      (plane_state->color_plane[1].offset - surf_addr)
> | aux_stride);
> +
> +	if (INTEL_GEN(dev_priv) < 12)
> +		aux_dist |= aux_stride;
> +	I915_WRITE_FW(PLANE_AUX_DIST(pipe, plane_id), aux_dist);
>  
>  	if (icl_is_hdr_plane(dev_priv, plane_id))
>  		I915_WRITE_FW(PLANE_CUS_CTL(pipe, plane_id),
> plane_state->cus_ctl);
> @@ -2102,7 +2105,8 @@ static int skl_plane_check_fb(const struct
> intel_crtc_state *crtc_state,
>  	    (fb->modifier == I915_FORMAT_MOD_Y_TILED ||
>  	     fb->modifier == I915_FORMAT_MOD_Yf_TILED ||
>  	     fb->modifier == I915_FORMAT_MOD_Y_TILED_CCS ||
> -	     fb->modifier == I915_FORMAT_MOD_Yf_TILED_CCS)) {
> +	     fb->modifier == I915_FORMAT_MOD_Yf_TILED_CCS ||
> +	     fb->modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS)) {
>  		DRM_DEBUG_KMS("Y/Yf tiling not supported in IF-ID
> mode\n");
>  		return -EINVAL;
>  	}
> @@ -2573,7 +2577,8 @@ static const u64
> skl_plane_format_modifiers_ccs[] = {
>  	DRM_FORMAT_MOD_INVALID
>  };
>  
> -static const u64 gen12_plane_format_modifiers_noccs[] = {
> +static const u64 gen12_plane_format_modifiers_ccs[] = {
> +	I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS,
>  	I915_FORMAT_MOD_Y_TILED,
>  	I915_FORMAT_MOD_X_TILED,
>  	DRM_FORMAT_MOD_LINEAR,
> @@ -2744,6 +2749,7 @@ static bool
> gen12_plane_format_mod_supported(struct drm_plane *_plane,
>  	case DRM_FORMAT_MOD_LINEAR:
>  	case I915_FORMAT_MOD_X_TILED:
>  	case I915_FORMAT_MOD_Y_TILED:
> +	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
>  		break;
>  	default:
>  		return false;
> @@ -2754,6 +2760,9 @@ static bool
> gen12_plane_format_mod_supported(struct drm_plane *_plane,
>  	case DRM_FORMAT_XBGR8888:
>  	case DRM_FORMAT_ARGB8888:
>  	case DRM_FORMAT_ABGR8888:
> +		if (is_ccs_modifier(modifier))
> +			return true;
> +		/* fall through */
>  	case DRM_FORMAT_RGB565:
>  	case DRM_FORMAT_XRGB2101010:
>  	case DRM_FORMAT_XBGR2101010:
> @@ -2963,13 +2972,11 @@ skl_universal_plane_create(struct
> drm_i915_private *dev_priv,
>  		formats = skl_get_plane_formats(dev_priv, pipe,
>  						plane_id,
> &num_formats);
>  
> +	plane->has_ccs = skl_plane_has_ccs(dev_priv, pipe, plane_id);
>  	if (INTEL_GEN(dev_priv) >= 12) {
> -		/* TODO: Implement support for gen-12 CCS modifiers */
> -		plane->has_ccs = false;
> -		modifiers = gen12_plane_format_modifiers_noccs;
> +		modifiers = gen12_plane_format_modifiers_ccs;
>  		plane_funcs = &gen12_plane_funcs;
>  	} else {
> -		plane->has_ccs = skl_plane_has_ccs(dev_priv, pipe,
> plane_id);
>  		if (plane->has_ccs)
>  			modifiers = skl_plane_format_modifiers_ccs;
>  		else
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> index cbb4689af432..bbfedeb00b7f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6800,6 +6800,7 @@ enum {
>  #define   PLANE_CTL_YUV422_VYUY			(3 << 16)
>  #define   PLANE_CTL_RENDER_DECOMPRESSION_ENABLE	(1 << 15)
>  #define   PLANE_CTL_TRICKLE_FEED_DISABLE	(1 << 14)
> +#define   PLANE_CTL_CLEAR_COLOR_DISABLE		(1 << 13) /*
> TGL+ */
>  #define   PLANE_CTL_PLANE_GAMMA_DISABLE		(1 << 13) /*
> Pre-GLK */
>  #define   PLANE_CTL_TILED_MASK			(0x7 << 10)
>  #define   PLANE_CTL_TILED_LINEAR		(0 << 10)
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