drm/i915: Update plane alignment requirements for TGL+

Currently we still use the SKL+ PLANE_SURF alignment even
for TGL+ even though the hardware no longer needs it.
Introduce a separate tgl_plane_min_alignment() and update
it to more accurately reflect the hardware requirements.

v2: Don't screw up DPT+semiplanar 2MiB alignment
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240612204712.31404-9-ville.syrjala@linux.intel.com

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

@@ -503,75 +503,85 @@ skl_plane_max_stride(struct intel_plane *plane,
 				max_pixels, max_bytes);
 }
 
-static unsigned int skl_plane_min_alignment(struct intel_plane *plane,
-					    const struct drm_framebuffer *fb,
-					    int color_plane)
+static u32 tgl_plane_min_alignment(struct intel_plane *plane,
+				   const struct drm_framebuffer *fb,
+				   int color_plane)
 {
-	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
-
-	if (intel_fb_uses_dpt(fb)) {
-		/* AUX_DIST needs only 4K alignment */
-		if (intel_fb_is_ccs_aux_plane(fb, color_plane))
-			return 512 * 4096;
-
-		/*
-		 * FIXME ADL sees GGTT/DMAR faults with async
-		 * flips unless we align to 16k at least.
-		 * Figure out what's going on here...
-		 */
-		if (IS_ALDERLAKE_P(dev_priv) &&
-		    !intel_fb_is_ccs_modifier(fb->modifier) &&
-		    HAS_ASYNC_FLIPS(dev_priv))
-			return 512 * 16 * 1024;
-
-		return 512 * 4096;
-	}
+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
+	/* PLANE_SURF GGTT -> DPT alignment */
+	int mult = intel_fb_uses_dpt(fb) ? 512 : 1;
 
 	/* AUX_DIST needs only 4K alignment */
 	if (intel_fb_is_ccs_aux_plane(fb, color_plane))
-		return 4096;
+		return mult * 4 * 1024;
 
 	if (is_semiplanar_uv_plane(fb, color_plane)) {
+		if (intel_fb_uses_dpt(fb))
+			return 512 * 4 * 1024;
+
 		/*
 		 * TODO: cross-check wrt. the bspec stride in bytes * 64 bytes
 		 * alignment for linear UV planes on all platforms.
 		 */
-		if (DISPLAY_VER(dev_priv) >= 12) {
-			if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
-				return 256 * 1024;
-
-			return intel_tile_row_size(fb, color_plane);
-		}
+		if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
+			return 256 * 1024;
 
-		return 4096;
+		return intel_tile_row_size(fb, color_plane);
 	}
 
-	drm_WARN_ON(&dev_priv->drm, color_plane != 0);
-
 	switch (fb->modifier) {
 	case DRM_FORMAT_MOD_LINEAR:
-		return 256 * 1024;
 	case I915_FORMAT_MOD_X_TILED:
-		if (HAS_ASYNC_FLIPS(dev_priv))
-			return 256 * 1024;
-		return 0;
+	case I915_FORMAT_MOD_Y_TILED:
+	case I915_FORMAT_MOD_4_TILED:
+		/*
+		 * FIXME ADL sees GGTT/DMAR faults with async
+		 * flips unless we align to 16k at least.
+		 * Figure out what's going on here...
+		 */
+		if (IS_ALDERLAKE_P(i915) && HAS_ASYNC_FLIPS(i915))
+			return mult * 16 * 1024;
+		return mult * 4 * 1024;
 	case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
 	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
 	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC:
 	case I915_FORMAT_MOD_4_TILED_MTL_MC_CCS:
 	case I915_FORMAT_MOD_4_TILED_MTL_RC_CCS:
 	case I915_FORMAT_MOD_4_TILED_MTL_RC_CCS_CC:
-		return 16 * 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:
+		/*
+		 * Align to at least 4x1 main surface
+		 * tiles (16K) to match 64B of AUX.
+		 */
+		return max(mult * 4 * 1024, 16 * 1024);
+	default:
+		MISSING_CASE(fb->modifier);
+		return 0;
+	}
+}
+
+static u32 skl_plane_min_alignment(struct intel_plane *plane,
+				   const struct drm_framebuffer *fb,
+				   int color_plane)
+{
+	/*
+	 * AUX_DIST needs only 4K alignment,
+	 * as does ICL UV PLANE_SURF.
+	 */
+	if (color_plane != 0)
+		return 4 * 1024;
+
+	switch (fb->modifier) {
+	case DRM_FORMAT_MOD_LINEAR:
+	case I915_FORMAT_MOD_X_TILED:
+		return 256 * 1024;
 	case I915_FORMAT_MOD_Y_TILED_CCS:
 	case I915_FORMAT_MOD_Yf_TILED_CCS:
 	case I915_FORMAT_MOD_Y_TILED:
-	case I915_FORMAT_MOD_4_TILED:
 	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:
 		MISSING_CASE(fb->modifier);
 		return 0;
@@ -2506,7 +2516,10 @@ skl_universal_plane_create(struct drm_i915_private *dev_priv,
 	else
 		plane->max_stride = skl_plane_max_stride;
 
-	plane->min_alignment = skl_plane_min_alignment;
+	if (DISPLAY_VER(dev_priv) >= 12)
+		plane->min_alignment = tgl_plane_min_alignment;
+	else
+		plane->min_alignment = skl_plane_min_alignment;
 
 	if (DISPLAY_VER(dev_priv) >= 11) {
 		plane->update_noarm = icl_plane_update_noarm;