diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_buf.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c b/drivers/gpu/drm/exynos/exynos_drm_buf.c index 9732043..9601bad 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_buf.c +++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c @@ -34,7 +34,7 @@ static int lowlevel_buffer_allocate(struct drm_device *dev, unsigned int flags, struct exynos_drm_gem_buf *buf) { int ret = 0; - enum dma_attr attr = DMA_ATTR_FORCE_CONTIGUOUS; + enum dma_attr attr; unsigned int nr_pages; DRM_DEBUG_KMS("%s\n", __FILE__); @@ -46,8 +46,22 @@ static int lowlevel_buffer_allocate(struct drm_device *dev, init_dma_attrs(&buf->dma_attrs); - if (flags & EXYNOS_BO_NONCONTIG) + /* + * if EXYNOS_BO_CONTIG, fully physically contiguous memory + * region will be allocated else physically contiguous + * as possible. + */ + if (flags & EXYNOS_BO_CONTIG) + dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &buf->dma_attrs); + + /* + * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping + * else cachable mapping. + */ + if (flags & EXYNOS_BO_WC || !(flags & EXYNOS_BO_CACHABLE)) attr = DMA_ATTR_WRITE_COMBINE; + else + attr = DMA_ATTR_NON_CONSISTENT; dma_set_attr(attr, &buf->dma_attrs); dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->dma_attrs); |