[PATCH] drm: Clarify DRM_MODE_REFLECT_X/Y documentation

[Sean Paul]

On Fri, Aug 10, 2018 at 06:50:31PM +0100, Alexandru Gheorghe wrote:
> DRM_MODE_REFLECT_X and DRM_MODE_REFLECT_Y meaning seems a bit unclear
> to me, so try to clarify that with a bit of ascii graphics.
> 
> Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>

Reviewed-by: Sean Paul <seanpaul at chromium.org>

> ---
>  include/uapi/drm/drm_mode.h | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index 8d67243952f4..ac5de85c93eb 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -186,9 +186,18 @@ extern "C" {
>  /*
>   * DRM_MODE_REFLECT_<axis>
>   *
> - * Signals that the contents of a drm plane is reflected in the <axis> axis,
> + * Signals that the contents of a drm plane is reflected along the <axis> axis,
>   * in the same way as mirroring.
>   *
> + * DRM_MODE_REFLECT_X
> + * |o |    | o|
> + * |  | -> |  |
> + * | v|    |v |
> + *
> + * DRM_MODE_REFLECT_Y
> + * |o |    | ^|
> + * |  | -> |  |
> + * | v|    |o |
>   * This define is provided as a convenience, looking up the property id
>   * using the name->prop id lookup is the preferred method.
>   */
> -- 
> 2.18.0
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS