[PATCH v2 38/40] drm/i915/tgl: Gen-12 render decompression

[Lucas De Marchi <lucas.demarchi@intel.com>]

From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

Gen-12 decompression is supported with Y-tiled main surface. The CCS is
linear and has 4 bits of data for each main surface cache line pair, a
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 decompression is
supported on all planes except cursor and on all pipes. This patch adds
decompression support for [A,X]BGR888 pixel formats.

Bspec: 18437

v2: Fix checkpatch warnings (Lucas)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 63 +++++++++++++++++---
 drivers/gpu/drm/i915/display/intel_sprite.c  | 23 ++++---
 2 files changed, 71 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 109d4fd961c6..190adbffe055 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -1912,6 +1912,10 @@ intel_tile_width_bytes(const struct drm_framebuffer *fb, int color_plane)
 		if (color_plane == 1)
 			return 128;
 		/* fall through */
+	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
+		if (color_plane == 1)
+			return cpp;
+		/* fall through */
 	case I915_FORMAT_MOD_Y_TILED:
 		if (IS_GEN(dev_priv, 2) || HAS_128_BYTE_Y_TILING(dev_priv))
 			return 128;
@@ -2045,6 +2049,8 @@ 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 4 * 4 * 1024;
 	case I915_FORMAT_MOD_Y_TILED_CCS:
 	case I915_FORMAT_MOD_Yf_TILED_CCS:
 	case I915_FORMAT_MOD_Y_TILED:
@@ -2242,7 +2248,8 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
 
 static bool is_surface_linear(u64 modifier, int color_plane)
 {
-	return modifier == DRM_FORMAT_MOD_LINEAR;
+	return modifier == DRM_FORMAT_MOD_LINEAR ||
+	       (modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS && color_plane == 1);
 }
 
 static u32 intel_adjust_aligned_offset(int *x, int *y,
@@ -2429,6 +2436,7 @@ 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;
@@ -2449,7 +2457,7 @@ 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,
@@ -2460,6 +2468,24 @@ 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 2 x 32 pixels in
+ * the main surface.
+ */
+static const struct drm_format_info gen12_ccs_formats[] = {
+	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 2, .vsub = 32, },
+	{ .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 2, .vsub = 32, },
+	{ .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 2, .vsub = 32, .has_alpha = true },
+	{ .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 2,
+	  .cpp = { 4, 1, }, .hsub = 2, .vsub = 32, .has_alpha = true },
+};
+
 static const struct drm_format_info *
 lookup_format_info(const struct drm_format_info formats[],
 		   int num_formats, u32 format)
@@ -2480,8 +2506,12 @@ 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;
@@ -2490,7 +2520,8 @@ 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;
 }
 
@@ -2659,7 +2690,13 @@ intel_fill_fb_info(struct drm_i915_private *dev_priv,
 			int main_x, main_y;
 			int ccs_x, ccs_y;
 
-			intel_tile_dims(fb, i, &tile_width, &tile_height);
+			if (!is_surface_linear(fb->modifier, i)) {
+				intel_tile_dims(fb, i, &tile_width, &tile_height);
+			} else {
+				tile_width = 64 / cpp;
+				tile_height = 1;
+			}
+
 			tile_width *= hsub;
 			tile_height *= vsub;
 
@@ -4053,6 +4090,8 @@ static u32 skl_plane_ctl_tiling(u64 fb_modifier)
 	case I915_FORMAT_MOD_Y_TILED:
 		return PLANE_CTL_TILED_Y;
 	case I915_FORMAT_MOD_Y_TILED_CCS:
+		/* fall through */
+	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
 		return PLANE_CTL_TILED_Y | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
 	case I915_FORMAT_MOD_Yf_TILED:
 		return PLANE_CTL_TILED_YF;
@@ -9828,7 +9867,9 @@ 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;
@@ -15695,6 +15736,14 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
 		    is_ccs_modifier(fb->modifier))
 			stride_alignment *= 4;
 
+		/*
+		 * The main surface pitch must be paded to a multiple of four
+		 * tile widths.
+		 */
+		if (fb->modifier == I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS &&
+		    i == 0)
+			stride_alignment *= 4;
+
 		if (fb->pitches[i] & (stride_alignment - 1)) {
 			DRM_DEBUG_KMS("plane %d pitch (%d) must be at least %u byte aligned\n",
 				      i, fb->pitches[i], stride_alignment);
diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
index 71dae3c2f9db..73d32017be89 100644
--- a/drivers/gpu/drm/i915/display/intel_sprite.c
+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
@@ -547,6 +547,7 @@ 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->base.dst.x1;
 	int crtc_y = plane_state->base.dst.y1;
@@ -588,8 +589,10 @@ 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)) {
 		u32 cus_ctl = 0;
@@ -1745,7 +1748,8 @@ 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;
 	}
@@ -2157,7 +2161,8 @@ 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,
@@ -2319,6 +2324,7 @@ 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;
@@ -2329,6 +2335,9 @@ 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:
@@ -2524,13 +2533,11 @@ 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
-- 
2.21.0

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