drm/i915/tgl: Make sure FBs have a correct CCS plane stride

The CCS plane stride must be fixed on TGL, as it's not configurable for the display. Instead the HW has a hardwired logic to determine it from the main plane stride. Make sure userspace passes in the correct stride. Cc: Dhinakaran Pandiyan <[email protected]> Cc: Ville Syrjälä <[email protected]> Cc: Mika Kahola <[email protected]> Signed-off-by: Imre Deak <[email protected]> Reviewed-by: Mika Kahola <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
ambv · Dec 23, 2019 · 71df86f · 71df86f
1 parent b3e57bc
commit 71df86f
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2621,6 +2621,12 @@ bool is_ccs_modifier(u64 modifier)
 	       modifier == I915_FORMAT_MOD_Yf_TILED_CCS;
 }
 
+static int gen12_ccs_aux_stride(struct drm_framebuffer *fb, int ccs_plane)
+{
+	return DIV_ROUND_UP(fb->pitches[ccs_to_main_plane(fb, ccs_plane)],
+			    512) * 64;
+}
+
 u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv,
 			      u32 pixel_format, u64 modifier)
 {
@@ -16550,6 +16556,17 @@ static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
 			goto err;
 		}
 
+		if (is_gen12_ccs_plane(fb, i)) {
+			int ccs_aux_stride = gen12_ccs_aux_stride(fb, i);
+
+			if (fb->pitches[i] != ccs_aux_stride) {
+				DRM_DEBUG_KMS("ccs aux plane %d pitch (%d) must be %d\n",
+					      i,
+					      fb->pitches[i], ccs_aux_stride);
+				goto err;
+			}
+		}
+
 		fb->obj[i] = &obj->base;
 	}