radv: Add nodisplaydcc option.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9318>

docs/envvars.rst

@@ -579,6 +579,8 @@ RADV driver environment variables
       disable compute queue
    ``nodcc``
       disable Delta Color Compression (DCC) on images
+   ``nodisplaydcc``
+      disable Delta Color Compression (DCC) on displayable images
    ``nodynamicbounds``
       do not check OOB access for dynamic descriptors
    ``nofastclears``

src/amd/vulkan/radv_debug.h

@@ -60,6 +60,7 @@ enum {
 	RADV_DEBUG_IMG               = 1ull << 29,
 	RADV_DEBUG_NO_UMR            = 1ull << 30,
 	RADV_DEBUG_INVARIANT_GEOM    = 1ull << 31,
+	RADV_DEBUG_NO_DISPLAY_DCC    = 1ull << 32,
 };
 
 enum {

src/amd/vulkan/radv_device.c

@@ -796,6 +796,7 @@ static const struct debug_control radv_debug_options[] = {
 	{"img", RADV_DEBUG_IMG},
 	{"noumr", RADV_DEBUG_NO_UMR},
 	{"invariantgeom", RADV_DEBUG_INVARIANT_GEOM},
+	{"nodisplaydcc", RADV_DEBUG_NO_DISPLAY_DCC},
 	{NULL, 0}
 };
 

src/amd/vulkan/radv_formats.c

@@ -1152,7 +1152,7 @@ radv_get_modifier_flags(struct radv_physical_device *dev,
 	if (ac_modifier_has_dcc(modifier)) {
 		features &= ~VK_FORMAT_FEATURE_STORAGE_IMAGE_BIT;
 
-		if (dev->instance->debug_flags & RADV_DEBUG_NO_DCC)
+		if (dev->instance->debug_flags & (RADV_DEBUG_NO_DCC | RADV_DEBUG_NO_DISPLAY_DCC))
 			return 0;
 	}
 

src/amd/vulkan/radv_image.c

@@ -424,6 +424,8 @@ radv_patch_image_from_extra_info(struct radv_device *device,
 
 		if (radv_surface_has_scanout(device, create_info)) {
 			image->planes[plane].surface.flags |= RADEON_SURF_SCANOUT;
+			if (device->instance->debug_flags & RADV_DEBUG_NO_DISPLAY_DCC)
+				image->planes[plane].surface.flags |= RADEON_SURF_DISABLE_DCC;
 
 			image->info.surf_index = NULL;
 		}