Hi All,
Please review the following patch.
regards,
Rahul Sharma
On Wed, Nov 7, 2012 at 4:38 PM, Rahul Sharma <rahul.sharma@xxxxxxxxxxx> wrote:
> From: Prathyush K <prathyush.k@xxxxxxxxxxx>
>
> This patch adds a exynos drm specific implementation of fb_mmap
> which supports mapping a non-contiguous buffer to user space.
>
> This new function does not assume that the frame buffer is contiguous
> and calls dma_mmap_writecombine for mapping the buffer to user space.
> dma_mmap_writecombine will be able to map a contiguous buffer as well
> as non-contig buffer depending on whether an IOMMU mapping is created
> for drm or not.
>
> Signed-off-by: Prathyush K <prathyush.k@xxxxxxxxxxx>
> Signed-off-by: Rahul Sharma <rahul.sharma@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 26 ++++++++++++++++++++++++++
> 1 files changed, 26 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> index 67eb6ba..3939f7f 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
> @@ -46,8 +46,34 @@ struct exynos_drm_fbdev {
> struct exynos_drm_gem_obj *exynos_gem_obj;
> };
>
> +static int exynos_drm_fb_mmap(struct fb_info *info,
> + struct vm_area_struct *vma)
> +{
> + DRM_DEBUG_KMS("%s\n", __func__);
> +
> + if (!vma || !info) {
> + DRM_ERROR("invalid arguments vma 0x%x, info 0x%x.\n",
> + (unsigned int)vma, (unsigned int)info);
> + return -EINVAL;
> + }
> +
> + if (!info->screen_base || info->screen_size == 0) {
> + DRM_ERROR("invalid screen information.\n");
> + return -EINVAL;
> + }
> +
> + vma->vm_pgoff = 0;
> + vma->vm_flags |= VM_IO;
> + if (dma_mmap_writecombine(info->device, vma, info->screen_base,
> + info->fix.smem_start, vma->vm_end - vma->vm_start))
> + return -EAGAIN;
> +
> + return 0;
> +}
> +
> static struct fb_ops exynos_drm_fb_ops = {
> .owner = THIS_MODULE,
> + .fb_mmap = exynos_drm_fb_mmap,
> .fb_fillrect = cfb_fillrect,
> .fb_copyarea = cfb_copyarea,
> .fb_imageblit = cfb_imageblit,
> --
> 1.7.0.4
>
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