drm/i915/dg2: Add support for DG2 clear color compression

Add support for the DG2 specific render compression with clear color
framebuffer format.

DG2 onwards discrete gfx has support for new flat CCS mapping,
which brings in display feature in to avoid Aux walk for compressed
surface. This support build on top of Flat CCS support added in XEHPSDV.
FLAT CCS surface base address should be 64k aligned,
Compressed displayable surfaces must use tile4 format.

HAS: 1407880786
B.Spec : 7655
B.Spec : 53902

v2: Merge all bits required for the support of functionality into this
    patch from the patch adding the corresponding modifier.

Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Juha-Pekka Heikkilä <juha-pekka.heikkila@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Acked-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220411143405.1073845-5-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -8477,7 +8477,9 @@ static void intel_atomic_prepare_plane_clear_colors(struct intel_atomic_state *s
 
 		/*
 		 * The layout of the fast clear color value expected by HW
-		 * (the DRM ABI requiring this value to be located in fb at offset 0 of plane#2):
+		 * (the DRM ABI requiring this value to be located in fb at
+		 * offset 0 of cc plane, plane #2 previous generations or
+		 * plane #1 for flat ccs):
 		 * - 4 x 4 bytes per-channel value
 		 *   (in surface type specific float/int format provided by the fb user)
 		 * - 8 bytes native color value used by the display

drivers/gpu/drm/i915/display/intel_fb.c

@@ -107,6 +107,21 @@ static const struct drm_format_info gen12_ccs_cc_formats[] = {
 	  .hsub = 1, .vsub = 1, .has_alpha = true },
 };
 
+static const struct drm_format_info gen12_flat_ccs_cc_formats[] = {
+	{ .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 2,
+	  .char_per_block = { 4, 0 }, .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, 0 }, .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, 0 }, .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, 0 }, .block_w = { 1, 2 }, .block_h = { 1, 1 },
+	  .hsub = 1, .vsub = 1, .has_alpha = true },
+};
+
 struct intel_modifier_desc {
 	u64 modifier;
 	struct {
@@ -144,6 +159,14 @@ static const struct intel_modifier_desc intel_modifiers[] = {
 		.modifier = I915_FORMAT_MOD_4_TILED_DG2_MC_CCS,
 		.display_ver = { 13, 13 },
 		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_MC,
+	}, {
+		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC,
+		.display_ver = { 13, 13 },
+		.plane_caps = INTEL_PLANE_CAP_TILING_4 | INTEL_PLANE_CAP_CCS_RC_CC,
+
+		.ccs.cc_planes = BIT(1),
+
+		FORMAT_OVERRIDE(gen12_flat_ccs_cc_formats),
 	}, {
 		.modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS,
 		.display_ver = { 13, 13 },
@@ -393,17 +416,13 @@ bool intel_fb_plane_supports_modifier(struct intel_plane *plane, u64 modifier)
 static bool format_is_yuv_semiplanar(const struct intel_modifier_desc *md,
 				     const struct drm_format_info *info)
 {
-	int yuv_planes;
-
 	if (!info->is_yuv)
 		return false;
 
-	if (plane_caps_contain_any(md->plane_caps, INTEL_PLANE_CAP_CCS_MASK))
-		yuv_planes = 4;
+	if (hweight8(md->ccs.planar_aux_planes) == 2)
+		return info->num_planes == 4;
 	else
-		yuv_planes = 2;
-
-	return info->num_planes == yuv_planes;
+		return info->num_planes == 2;
 }
 
 /**
@@ -528,12 +547,13 @@ static unsigned int gen12_ccs_aux_stride(struct intel_framebuffer *fb, int ccs_p
 
 int skl_main_to_aux_plane(const struct drm_framebuffer *fb, int main_plane)
 {
+	const struct intel_modifier_desc *md = lookup_modifier(fb->modifier);
 	struct drm_i915_private *i915 = to_i915(fb->dev);
 
-	if (intel_fb_is_ccs_modifier(fb->modifier))
+	if (md->ccs.packed_aux_planes | md->ccs.planar_aux_planes)
 		return main_to_ccs_plane(fb, main_plane);
 	else if (DISPLAY_VER(i915) < 11 &&
-		 intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier))
+		 format_is_yuv_semiplanar(md, fb->format))
 		return 1;
 	else
 		return 0;
@@ -559,6 +579,7 @@ intel_tile_width_bytes(const struct drm_framebuffer *fb, int color_plane)
 		else
 			return 512;
 	case I915_FORMAT_MOD_4_TILED_DG2_RC_CCS:
+	case I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC:
 	case I915_FORMAT_MOD_4_TILED_DG2_MC_CCS:
 	case I915_FORMAT_MOD_4_TILED:
 		/*
@@ -763,6 +784,7 @@ unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
 	case I915_FORMAT_MOD_Yf_TILED:
 		return 1 * 1024 * 1024;
 	case I915_FORMAT_MOD_4_TILED_DG2_RC_CCS:
+	case I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC:
 	case I915_FORMAT_MOD_4_TILED_DG2_MC_CCS:
 		return 16 * 1024;
 	default:

drivers/gpu/drm/i915/display/skl_universal_plane.c

@@ -781,6 +781,8 @@ static u32 skl_plane_ctl_tiling(u64 fb_modifier)
 		return PLANE_CTL_TILED_4 |
 			PLANE_CTL_MEDIA_DECOMPRESSION_ENABLE |
 			PLANE_CTL_CLEAR_COLOR_DISABLE;
+	case I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC:
+		return PLANE_CTL_TILED_4 | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
 	case I915_FORMAT_MOD_Y_TILED_CCS:
 	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC:
 		return PLANE_CTL_TILED_Y | PLANE_CTL_RENDER_DECOMPRESSION_ENABLE;
@@ -1228,8 +1230,10 @@ icl_plane_update_noarm(struct intel_plane *plane,
 				  upper_32_bits(plane_state->ccval));
 	}
 
-	intel_de_write_fw(dev_priv, PLANE_AUX_DIST(pipe, plane_id),
-			  skl_plane_aux_dist(plane_state, color_plane));
+	/* FLAT CCS doesn't need to program AUX_DIST */
+	if (!HAS_FLAT_CCS(dev_priv))
+		intel_de_write_fw(dev_priv, PLANE_AUX_DIST(pipe, plane_id),
+				  skl_plane_aux_dist(plane_state, color_plane));
 
 	if (icl_is_hdr_plane(dev_priv, plane_id))
 		intel_de_write_fw(dev_priv, PLANE_CUS_CTL(pipe, plane_id),
@@ -1629,9 +1633,10 @@ static int skl_check_main_surface(struct intel_plane_state *plane_state)
 
 	/*
 	 * CCS AUX surface doesn't have its own x/y offsets, we must make sure
-	 * they match with the main surface x/y offsets.
+	 * they match with the main surface x/y offsets. On DG2
+	 * there's no aux plane on fb so skip this checking.
 	 */
-	if (intel_fb_is_ccs_modifier(fb->modifier)) {
+	if (intel_fb_is_ccs_modifier(fb->modifier) && aux_plane) {
 		while (!skl_check_main_ccs_coordinates(plane_state, x, y,
 						       offset, aux_plane)) {
 			if (offset == 0)
@@ -1675,6 +1680,8 @@ static int skl_check_nv12_aux_surface(struct intel_plane_state *plane_state)
 	const struct drm_framebuffer *fb = plane_state->hw.fb;
 	unsigned int rotation = plane_state->hw.rotation;
 	int uv_plane = 1;
+	int ccs_plane = intel_fb_is_ccs_modifier(fb->modifier) ?
+			skl_main_to_aux_plane(fb, uv_plane) : 0;
 	int max_width = intel_plane_max_width(plane, fb, uv_plane, rotation);
 	int max_height = intel_plane_max_height(plane, fb, uv_plane, rotation);
 	int x = plane_state->uapi.src.x1 >> 17;
@@ -1695,8 +1702,7 @@ static int skl_check_nv12_aux_surface(struct intel_plane_state *plane_state)
 	offset = intel_plane_compute_aligned_offset(&x, &y,
 						    plane_state, uv_plane);
 
-	if (intel_fb_is_ccs_modifier(fb->modifier)) {
-		int ccs_plane = main_to_ccs_plane(fb, uv_plane);
+	if (ccs_plane) {
 		u32 aux_offset = plane_state->view.color_plane[ccs_plane].offset;
 		u32 alignment = intel_surf_alignment(fb, uv_plane);
 
@@ -2438,10 +2444,15 @@ skl_get_initial_plane_config(struct intel_crtc *crtc,
 		break;
 	case PLANE_CTL_TILED_YF: /* aka PLANE_CTL_TILED_4 on XE_LPD+ */
 		if (HAS_4TILE(dev_priv)) {
-			if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
+			u32 rc_mask = PLANE_CTL_RENDER_DECOMPRESSION_ENABLE |
+				      PLANE_CTL_CLEAR_COLOR_DISABLE;
+
+			if ((val & rc_mask) == rc_mask)
 				fb->modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS;
 			else if (val & PLANE_CTL_MEDIA_DECOMPRESSION_ENABLE)
 				fb->modifier = I915_FORMAT_MOD_4_TILED_DG2_MC_CCS;
+			else if (val & PLANE_CTL_RENDER_DECOMPRESSION_ENABLE)
+				fb->modifier = I915_FORMAT_MOD_4_TILED_DG2_RC_CCS_CC;
 			else
 				fb->modifier = I915_FORMAT_MOD_4_TILED;
 		} else {