Re: [PATCH 01/23] drm: Create Color Management DRM properties

[Matt Roper <matthew.d.roper@intel.com>]

On Wed, Sep 16, 2015 at 11:06:58PM +0530, Shashank Sharma wrote:
> From: Kausal Malladi <kausalmalladi@gmail.com>
> 
> Color Management is an extension to Kernel display framework. It allows
> abstraction of hardware color correction and enhancement capabilities by
> virtue of DRM properties.
> 
> This patch initializes color management framework by :
> 1. Introducing new pointers in DRM mode_config structure to
>    carry CTM and Palette color correction properties.
> 2. Creating these DRM properties in DRM standard properties creation
>    sequence.
> 
> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
> Signed-off-by: Kausal Malladi <kausalmalladi@gmail.com>

We should probably update the property section of
Documentation/DocBook/drm.tmpl with this patch as well to include these
new properties in the table (that docbook ultimately generates
documentation that looks like
https://kernel.org/doc/htmldocs/drm/drm-kms-properties.html ).

One minor note:  people not involved in color management probably won't
immediately figure out what "CTM" stands for, so you might want to just
add a comment somewhere that spells out the full "color transformation
matrix" term.


Matt


> ---
>  drivers/gpu/drm/drm_crtc.c | 26 ++++++++++++++++++++++++++
>  include/drm/drm_crtc.h     |  6 ++++++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 9b9c4b4..d809c67 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -1472,6 +1472,32 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
>  		return -ENOMEM;
>  	dev->mode_config.prop_mode_id = prop;
>  
> +	/* Color Management properties */
> +	prop = drm_property_create(dev,
> +			DRM_MODE_PROP_BLOB | DRM_MODE_PROP_IMMUTABLE,
> +			"CRTC_PALETTE_CAPABILITIES", 0);
> +	if (!prop)
> +		return -ENOMEM;
> +	dev->mode_config.cm_crtc_palette_capabilities_property = prop;
> +
> +	prop = drm_property_create(dev,
> +			DRM_MODE_PROP_BLOB, "PALETTE_AFTER_CTM", 0);
> +	if (!prop)
> +		return -ENOMEM;
> +	dev->mode_config.cm_palette_after_ctm_property = prop;
> +
> +	prop = drm_property_create(dev,
> +			DRM_MODE_PROP_BLOB, "PALETTE_BEFORE_CTM", 0);
> +	if (!prop)
> +		return -ENOMEM;
> +	dev->mode_config.cm_palette_before_ctm_property = prop;
> +
> +	prop = drm_property_create(dev,
> +			DRM_MODE_PROP_BLOB, "CTM", 0);
> +	if (!prop)
> +		return -ENOMEM;
> +	dev->mode_config.cm_ctm_property = prop;
> +
>  	return 0;
>  }
>  
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index c0366e9..c35531e 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1153,6 +1153,12 @@ struct drm_mode_config {
>  	struct drm_property *suggested_x_property;
>  	struct drm_property *suggested_y_property;
>  
> +	/* Color Management Properties */
> +	struct drm_property *cm_crtc_palette_capabilities_property;
> +	struct drm_property *cm_palette_before_ctm_property;
> +	struct drm_property *cm_palette_after_ctm_property;
> +	struct drm_property *cm_ctm_property;
> +
>  	/* dumb ioctl parameters */
>  	uint32_t preferred_depth, prefer_shadow;
>  
> -- 
> 1.9.1
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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