[PATCH 1/1] drm: exynos: fix for mapping contigous dma buffers

[Inki Dae]

2012. 11. 3. 오후 9:21 Rahul Sharma <rahul.sharma at samsung.com> 작성:

> 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 at samsung.com>
> ---
> 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;
> +    }

Is there any reason you are sending patches respectively? It's better to combine them.

Thanks,
Inki Dae

> 
>    return vm_insert_mixed(vma, f_vaddr, pfn);
> }
> -- 
> 1.7.0.4
> 
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