[Intel-gfx] [PATCH 07/15] drm/i915/tgl: Make sure FBs have a correct CCS plane stride

[Imre Deak]

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 <dhinakaran.pandiyan at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 641ea24539eb..7c52591172e1 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2620,6 +2620,11 @@ 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)
 {
@@ -16530,6 +16535,16 @@ 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;
 	}
 
-- 
2.22.0