| Message ID | 1442380605-32321-1-git-send-email-jy0922.shim@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Joonyoung, 2015-09-16 Joonyoung Shim <jy0922.shim@samsung.com>: > There is no guarantee that DMA addresses are the same as physical > addresses, but dma_to_pfn() knows how to convert a dma_addr_t to a PFN > which can then be converted to a struct page. > > Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk> > Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> > --- > drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Gustavo
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c index f12fbc3..a4fb78e 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c @@ -77,7 +77,8 @@ static int exynos_drm_alloc_buf(struct exynos_drm_gem_obj *obj) start_addr = obj->dma_addr; while (i < nr_pages) { - obj->pages[i] = phys_to_page(start_addr); + obj->pages[i] = pfn_to_page(dma_to_pfn(dev->dev, + start_addr)); start_addr += PAGE_SIZE; i++; }
There is no guarantee that DMA addresses are the same as physical addresses, but dma_to_pfn() knows how to convert a dma_addr_t to a PFN which can then be converted to a struct page. Suggested-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> --- drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)