Re: [PATCH 1/3] drm/crtc: Add property for aspect ratio

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

On May-22-2014 5:08 PM, Thierry Reding wrote:
> On Thu, May 22, 2014 at 04:50:48PM +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.
>>
>> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
>> Cc: dri-devel@lists.freedesktop.org
>> ---
>>  drivers/gpu/drm/drm_crtc.c | 31 +++++++++++++++++++++++++++++++
>>  include/drm/drm_crtc.h     |  2 ++
>>  2 files changed, 33 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
>> index 37a3e07..84d359e 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[] = {
>> +	{ HDMI_PICTURE_ASPECT_NONE, "Automatic" },
>> +	{ HDMI_PICTURE_ASPECT_4_3, "4:3" },
>> +	{ HDMI_PICTURE_ASPECT_16_9, "16:9" },
>> +};
> 
> This seems like it should be either an HDMI specific property, since it
> uses values defined by HDMI/CEA. Alternatively we could introduce some
> new generic enumeration and translate that to the HDMI/CEA equivalent in
> the AVI infoframe helpers.
> 
> Doing so would allow us to add aspect ratios different from what HDMI or
> CEA define.
> 
>>  /*
>>   * Non-global properties, but "required" for certain connectors.
>>   */
>> @@ -1344,6 +1350,31 @@ 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.
>> + */
>> +int drm_mode_create_aspect_ratio_property(struct drm_device *dev)
>> +{
>> +	struct drm_property *aspect_ratio;
>> +
>> +	if (dev->mode_config.aspect_ratio_property)
>> +		return 0;
>> +
>> +	aspect_ratio =
>> +		drm_property_create_enum(dev, 0, "aspect ratio",
>> +				drm_aspect_ratio_enum_list,
>> +				    ARRAY_SIZE(drm_aspect_ratio_enum_list));
>> +
>> +	dev->mode_config.aspect_ratio_property = aspect_ratio;
> 
> I don't think you need the temporary aspect_ratio variable here. Can't
> you directly assign the new property to .aspect_ratio_property?
> 
> Thierry
> 
Thanks for your inputs.
I will make the following changes and resend the patch..
- Make the enum generic and translate that to the HDMI/CEA equivalent
for AVI IF.
- Remove the temporary aspect_ratio variable.

Thanks,
Vandana