disp: msm: fix CPU mapping for memory buffers

The DMA buffers used by the display module are cached buffers. While
mapping to the CPU, pgprot_writecombine should only be used for uncached
buffers. The change fixes this mismatch during virtual address mapping.

Change-Id: I2f54375b4eb4071d9bbcae44449bb6c99feb24a6
Signed-off-by: Satya Rama Aditya Pinapala <[email protected]>

msm/msm_gem.c

@@ -753,7 +753,7 @@ static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
 				dma_buf_vmap(obj->import_attach->dmabuf);
 		} else {
 			msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
-				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+				VM_MAP, PAGE_KERNEL);
 		}
 
 		if (msm_obj->vaddr == NULL) {