Re: [PATCH v4 1/4] drm/crtc: Add property for aspect ratio

[Thierry Reding <thierry.reding@gmail.com>]

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On Wed, Jun 11, 2014 at 10:46:48AM +0530, Vandana Kannan wrote:
> Added a property to enable user space to set aspect ratio.
> This patch contains declaration of the property and code to create the
> property.
> 
> v2: Thierry's review comments.
> 	- Made aspect ratio enum generic instead of HDMI/CEA specfic
> 	- Removed usage of temporary aspect_ratio variable
> 
> v3: Thierry's review comments.
> 	- Fixed indentation
> 
> v4: Thierry's review comments.
> 	- Return ENOMEM when property creation fails
> 
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> ---
>  drivers/gpu/drm/drm_crtc.c  | 33 +++++++++++++++++++++++++++++++++
>  include/drm/drm_crtc.h      |  2 ++
>  include/uapi/drm/drm_mode.h |  5 +++++
>  3 files changed, 40 insertions(+)

One nit below...

> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 37a3e07..a745df3 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -139,6 +139,12 @@ static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] =
>  	{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
>  };
>  
> +static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
> +	{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
> +	{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
> +	{ DRM_MODE_PICTURE_ASPECT_16_9, "16:9" },
> +};
> +
>  /*
>   * Non-global properties, but "required" for certain connectors.
>   */
> @@ -1344,6 +1350,33 @@ int drm_mode_create_scaling_mode_property(struct drm_device *dev)
>  EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
>  
>  /**
> + * drm_mode_create_aspect_ratio_property - create aspect ratio property
> + * @dev: DRM device
> + *
> + * Called by a driver the first time it's needed, must be attached to desired
> + * connectors.
> + *
> + * Returns:

According to Documentation/kernel-doc-nano-HOWTO.txt this section should
be named "Return:". But it seems that at least in DRM "Returns:" is used
much more often (89:31), so with or without this addressed:

Reviewed-by: Thierry Reding <treding@nvidia.com>

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