drm/xe/display: Mark dpt and related vma as uncached

Mark dpt and related vma as uncached to avoid pipe faults on some devices.
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240318201850.127785-1-juhapekka.heikkila@gmail.com

drivers/gpu/drm/xe/display/xe_fb_pin.c

@@ -30,7 +30,7 @@ write_dpt_rotated(struct xe_bo *bo, struct iosys_map *map, u32 *dpt_ofs, u32 bo_
 
 		for (row = 0; row < height; row++) {
 			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, src_idx * XE_PAGE_SIZE,
-							      xe->pat.idx[XE_CACHE_WB]);
+							      xe->pat.idx[XE_CACHE_NONE]);
 
 			iosys_map_wr(map, *dpt_ofs, u64, pte);
 			*dpt_ofs += 8;
@@ -62,7 +62,7 @@ write_dpt_remapped(struct xe_bo *bo, struct iosys_map *map, u32 *dpt_ofs,
 		for (column = 0; column < width; column++) {
 			iosys_map_wr(map, *dpt_ofs, u64,
 				     pte_encode_bo(bo, src_idx * XE_PAGE_SIZE,
-				     xe->pat.idx[XE_CACHE_WB]));
+				     xe->pat.idx[XE_CACHE_NONE]));
 
 			*dpt_ofs += 8;
 			src_idx++;
@@ -122,7 +122,7 @@ static int __xe_pin_fb_vma_dpt(struct intel_framebuffer *fb,
 
 		for (x = 0; x < size / XE_PAGE_SIZE; x++) {
 			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, x * XE_PAGE_SIZE,
-							      xe->pat.idx[XE_CACHE_WB]);
+							      xe->pat.idx[XE_CACHE_NONE]);
 
 			iosys_map_wr(&dpt->vmap, x * 8, u64, pte);
 		}
@@ -168,7 +168,7 @@ write_ggtt_rotated(struct xe_bo *bo, struct xe_ggtt *ggtt, u32 *ggtt_ofs, u32 bo
 
 		for (row = 0; row < height; row++) {
 			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, src_idx * XE_PAGE_SIZE,
-							      xe->pat.idx[XE_CACHE_WB]);
+							      xe->pat.idx[XE_CACHE_NONE]);
 
 			xe_ggtt_set_pte(ggtt, *ggtt_ofs, pte);
 			*ggtt_ofs += XE_PAGE_SIZE;
@@ -214,7 +214,7 @@ static int __xe_pin_fb_vma_ggtt(struct intel_framebuffer *fb,
 
 		for (x = 0; x < size; x += XE_PAGE_SIZE) {
 			u64 pte = ggtt->pt_ops->pte_encode_bo(bo, x,
-							      xe->pat.idx[XE_CACHE_WB]);
+							      xe->pat.idx[XE_CACHE_NONE]);
 
 			xe_ggtt_set_pte(ggtt, vma->node.start + x, pte);
 		}