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

[Vandana Kannan <vandana.kannan@intel.com>]

Hi Thierry/Daniel,

Please help review this patch series on aspect ratio and let me know
your inputs..

1. http://lists.freedesktop.org/archives/dri-devel/2014-June/061576.html
- All review comments (from Thierry) addressed.
2. http://lists.freedesktop.org/archives/dri-devel/2014-June/061217.html
- R-b from Thierry
3. http://lists.freedesktop.org/archives/dri-devel/2014-June/061577.html
4. http://lists.freedesktop.org/archives/dri-devel/2014-June/061592.html
- R-b from Sagar

Thanks,
Vandana

On Jun-11-2014 10:46 AM, Kannan, Vandana 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(+)
> 
> 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:
> + * Zero on success, errno on failure.
> + */
> +int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
> +{
> +	if (dev->mode_config.aspect_ratio_property)
> +		return 0;
> +
> +	dev->mode_config.aspect_ratio_property =
> +		drm_property_create_enum(dev, 0, "aspect ratio",
> +				drm_aspect_ratio_enum_list,
> +				ARRAY_SIZE(drm_aspect_ratio_enum_list));
> +
> +	if (dev->mode_config.aspect_ratio_property == NULL)
> +		return -ENOMEM;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_mode_create_aspect_ratio_property);
> +
> +/**
>   * drm_mode_create_dirty_property - create dirty property
>   * @dev: DRM device
>   *
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 5c1c31c..1149617 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -801,6 +801,7 @@ struct drm_mode_config {
>  
>  	/* Optional properties */
>  	struct drm_property *scaling_mode_property;
> +	struct drm_property *aspect_ratio_property;
>  	struct drm_property *dirty_info_property;
>  
>  	/* dumb ioctl parameters */
> @@ -971,6 +972,7 @@ extern int drm_mode_create_dvi_i_properties(struct drm_device *dev);
>  extern int drm_mode_create_tv_properties(struct drm_device *dev, int num_formats,
>  				     char *formats[]);
>  extern int drm_mode_create_scaling_mode_property(struct drm_device *dev);
> +extern int drm_mode_create_aspect_ratio_property(struct drm_device *dev);
>  extern int drm_mode_create_dirty_info_property(struct drm_device *dev);
>  extern const char *drm_get_encoder_name(const struct drm_encoder *encoder);
>  
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index f104c26..943b377 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -88,6 +88,11 @@
>  #define DRM_MODE_SCALE_CENTER		2 /* Centered, no scaling */
>  #define DRM_MODE_SCALE_ASPECT		3 /* Full screen, preserve aspect */
>  
> +/* Picture aspect ratio options */
> +#define DRM_MODE_PICTURE_ASPECT_NONE	0
> +#define DRM_MODE_PICTURE_ASPECT_4_3	1
> +#define DRM_MODE_PICTURE_ASPECT_16_9	2
> +
>  /* Dithering mode options */
>  #define DRM_MODE_DITHERING_OFF	0
>  #define DRM_MODE_DITHERING_ON	1
>