Re: [PATCH 05/10] drm: Define helper function for plane color enabling

[Sean Paul <seanpaul@chromium.org>]

On Thu, Feb 15, 2018 at 12:32:55AM -0500, Daniele Castagna wrote:
> From: "uma.shankar at intel.com (Uma Shankar)" <uma.shankar@intel.com>
> 
> Define helper function to enable Plane color features
> to attach plane color properties to plane structure.
> 
> (am from https://patchwork.kernel.org/patch/9971333/)
> 
> Change-Id: I0a6647607fe482786e7cdb5f997faf196b2f59a2
> Signed-off-by: Uma Shankar <uma.shankar at intel.com>
> ---
>  drivers/gpu/drm/drm_plane.c  | 48 ++++++++++++++++++++++++++++++++++++
>  include/drm/drm_color_mgmt.h |  5 ++++
>  2 files changed, 53 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
> index 2c90519576a3e..bc2fc5e6771ac 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -143,6 +143,54 @@ static int create_in_format_blob(struct drm_device *dev, struct drm_plane *plane
>  	return 0;
>  }
>  
> + /**
> + * drm_plane_enable_color_mgmt - enable color management properties
> + * @plane: DRM Plane
> + * @plane_degamma_lut_size: the size of the degamma lut (before CSC)
> + * @plane_has_ctm: whether to attach ctm_property for CSC matrix
> + * @plane_gamma_lut_size: the size of the gamma lut (after CSC)
> + *
> + * This function lets the driver enable the color correction
> + * properties on a plane. This includes 3 degamma, csc and gamma
> + * properties that userspace can set and 2 size properties to inform
> + * the userspace of the lut sizes. Each of the properties are
> + * optional. The gamma and degamma properties are only attached if
> + * their size is not 0 and ctm_property is only attached if has_ctm is
> + * true.
> + *
> + * Drivers should use drm_atomic_helper_legacy_gamma_set() to implement the
> + * legacy &drm_crtc_funcs.gamma_set callback.
> + */
> +void drm_plane_enable_color_mgmt(struct drm_plane *plane,
> +				uint plane_degamma_lut_size,
> +				bool plane_has_ctm,
> +				uint plane_gamma_lut_size)
> +{

This seems like a good place to create the properties once they're located in
drm_plane.

> +	struct drm_device *dev = plane->dev;
> +	struct drm_mode_config *config = &dev->mode_config;
> +
> +	if (plane_degamma_lut_size) {
> +		drm_object_attach_property(&plane->base,
> +				config->plane_degamma_lut_property, 0);
> +		drm_object_attach_property(&plane->base,
> +				config->plane_degamma_lut_size_property,
> +				plane_degamma_lut_size);
> +	}
> +
> +	if (plane_has_ctm)
> +		drm_object_attach_property(&plane->base,
> +				config->plane_ctm_property, 0);
> +
> +	if (plane_gamma_lut_size) {
> +		drm_object_attach_property(&plane->base,
> +				config->plane_gamma_lut_property, 0);
> +		drm_object_attach_property(&plane->base,
> +				config->plane_gamma_lut_size_property,
> +				plane_gamma_lut_size);
> +	}
> +}
> +EXPORT_SYMBOL(drm_plane_enable_color_mgmt);
> +
>  /**
>   * drm_universal_plane_init - Initialize a new universal plane object
>   * @dev: DRM device
> diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
> index 03a59cbce6212..155a9ba38471c 100644
> --- a/include/drm/drm_color_mgmt.h
> +++ b/include/drm/drm_color_mgmt.h
> @@ -37,4 +37,9 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
>  int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
>  				 int gamma_size);
>  
> +void drm_plane_enable_color_mgmt(struct drm_plane *plane,
> +				 uint plane_degamma_lut_size,
> +				 bool plane_has_ctm,
> +				 uint plane_gamma_lut_size);
> +
>  #endif
> -- 
> 2.16.1.291.g4437f3f132-goog
> 
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-- 
Sean Paul, Software Engineer, Google / Chromium OS
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