On a lenovo se100 server, when using i915 GPU for rendering, and the ast driver for display, the graphic output is corrupted, and almost unusable.
Adding a clflush call in the vmap function fixes this issue completely. Signed-off-by: Jocelyn Falempe <[email protected]> --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index f4f1c979d1b9..f6a8c1cbe4d1 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -77,6 +77,7 @@ static int i915_gem_dmabuf_vmap(struct dma_buf *dma_buf, return PTR_ERR(vaddr); iosys_map_set_vaddr(map, vaddr); + drm_clflush_virt_range(vaddr, dma_buf->size); return 0; } base-commit: 0790925dadad0997580df6e32cdccd54316807f2 -- 2.51.0
