[PATCH 01/10] drm/imx: ipuv3-plane: make sure x/y offsets are even in case of chroma subsampling

[Ying Liu]

On Wed, Oct 19, 2016 at 6:21 PM, Philipp Zabel <p.zabel at pengutronix.de> wrote:
> Odd x/y offsets are not allowed for horizontally/vertically chroma
> subsampled planar YUV formats.
>
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>

Acked-by: Liu Ying <gnuiyl at gmail.com>

> ---
> Changes since v1:
>  - Improve comment
> ---
>  drivers/gpu/drm/imx/ipuv3-plane.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> index 5c34299..e1ad844 100644
> --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> @@ -259,6 +259,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
>         struct drm_framebuffer *fb = state->fb;
>         struct drm_framebuffer *old_fb = old_state->fb;
>         unsigned long eba, ubo, vbo, old_ubo, old_vbo;
> +       int hsub, vsub;
>
>         /* Ok to disable */
>         if (!fb)
> @@ -372,6 +373,16 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
>
>                 if (old_fb && old_fb->pitches[1] != fb->pitches[1])
>                         crtc_state->mode_changed = true;
> +
> +               /*
> +                * The x/y offsets must be even in case of horizontal/vertical
> +                * chroma subsampling.
> +                */
> +               hsub = drm_format_horz_chroma_subsampling(fb->pixel_format);
> +               vsub = drm_format_vert_chroma_subsampling(fb->pixel_format);
> +               if (((state->src_x >> 16) & (hsub - 1)) ||
> +                   ((state->src_y >> 16) & (vsub - 1)))
> +                       return -EINVAL;
>         }
>
>         return 0;
> --
> 2.9.3
>