This patch fixes the problem of mapping contigous dma buffers. Currently page
struct is calculated from the buf->dma_addr which is not the physical address.
It is replaced by buf->pages which points to the page struct of the first page
of contigous memory chunk. This gives the correct page frame number for
mapping.
Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_gem.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index c557ac7..50d73f1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -120,8 +120,12 @@ static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
}
pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
- } else
- pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
+ } else {
+ if (!buf->pages)
+ return -EINTR;
+
+ pfn = page_to_pfn(buf->pages[0]) + page_offset;
+ }
return vm_insert_mixed(vma, f_vaddr, pfn);
}
--
1.7.0.4
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