[Intel-gfx] [PATCH 8/8] drm/i915/skl: Allow Y (and Yf) frame buffer creation

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

By this patch all underlying bits have been implemented and this
patch actually enables the feature.

v2: Validate passed in fb modifiers to reject garbage. (Daniel Vetter)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau at intel.com> (v1)
---
 drivers/gpu/drm/i915/intel_display.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1d50934..3232ddd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12783,6 +12783,19 @@ static int intel_framebuffer_init(struct drm_device *dev,
 	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 
 	if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
+		/* Passed in modifier sanity checking. */
+		switch (mode_cmd->modifier[0]) {
+		case DRM_FORMAT_MOD_NONE:
+		case I915_FORMAT_MOD_X_TILED:
+		case I915_FORMAT_MOD_Y_TILED:
+		case I915_FORMAT_MOD_Yf_TILED:
+			break;
+		default:
+			DRM_ERROR("Unsupported fb modifier 0x%llx!\n",
+				  mode_cmd->modifier[0]);
+			return -EINVAL;
+		}
+
 		/* Enforce that fb modifier and tiling mode match, but only for
 		 * X-tiled. This is needed for FBC. */
 		if (!!(obj->tiling_mode == I915_TILING_X) !=
@@ -12790,6 +12803,14 @@ static int intel_framebuffer_init(struct drm_device *dev,
 			DRM_DEBUG("tiling_mode doesn't match fb modifier\n");
 			return -EINVAL;
 		}
+
+		if (INTEL_INFO(dev)->gen < 9 &&
+		    (mode_cmd->modifier[0] == I915_FORMAT_MOD_Y_TILED ||
+		     mode_cmd->modifier[0] == I915_FORMAT_MOD_Yf_TILED)) {
+			DRM_DEBUG("Unsupported tiling 0x%llx!\n",
+				  mode_cmd->modifier[0]);
+			return -EINVAL;
+		}
 	} else {
 		if (obj->tiling_mode == I915_TILING_X)
 			mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
@@ -12799,11 +12820,6 @@ static int intel_framebuffer_init(struct drm_device *dev,
 		}
 	}
 
-	if (mode_cmd->modifier[0] == I915_FORMAT_MOD_Y_TILED) {
-		DRM_DEBUG("hardware does not support tiling Y\n");
-		return -EINVAL;
-	}
-
 	stride_alignment = intel_fb_stride_alignment(dev, mode_cmd->modifier[0],
 						     mode_cmd->pixel_format);
 	if (mode_cmd->pitches[0] & (stride_alignment - 1)) {
-- 
2.3.0