Re: [RFC v4 3/8] drm: Add Plane CTM property

["Lankhorst, Maarten" <maarten.lankhorst@intel.com>]

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fre 2018-08-17 klockan 19:48 +0530 skrev Uma Shankar:
> Add a blob property for plane CSC usage.
> 
> v2: Rebase
> 
> v3: Fixed Sean, Paul's review comments. Moved the property from
> mode_config to drm_plane. Created a helper function to instantiate
> these properties and removed from drm_mode_create_standard_properties
> Added property documentation as suggested by Daniel, Vetter.
> 
> v4: Rebase
> 
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> ---
>  Documentation/gpu/drm-kms.rst       |  3 +++
>  drivers/gpu/drm/drm_atomic.c        | 10 ++++++++++
>  drivers/gpu/drm/drm_atomic_helper.c |  4 ++++
>  drivers/gpu/drm/drm_plane.c         | 12 ++++++++++++
>  include/drm/drm_plane.h             | 15 +++++++++++++++
>  5 files changed, 44 insertions(+)
> 
> diff --git a/Documentation/gpu/drm-kms.rst b/Documentation/gpu/drm-
> kms.rst
> index 8b10b12..16d6d8d 100644
> --- a/Documentation/gpu/drm-kms.rst
> +++ b/Documentation/gpu/drm-kms.rst
> @@ -560,6 +560,9 @@ Plane Color Management Properties
>  .. kernel-doc:: drivers/gpu/drm/drm_plane.c
>     :doc: degamma_lut_size_property
>  
> +.. kernel-doc:: drivers/gpu/drm/drm_plane.c
> +   :doc: ctm_property
> +
>  Tile Group Property
>  -------------------
>  
> diff --git a/drivers/gpu/drm/drm_atomic.c
> b/drivers/gpu/drm/drm_atomic.c
> index f8cad9b..ddda935 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -917,6 +917,14 @@ static int drm_atomic_plane_set_property(struct
> drm_plane *plane,
>  					&replaced);
>  		state->color_mgmt_changed |= replaced;
>  		return ret;
> +	} else if (property == plane->ctm_property) {
> +		ret = drm_atomic_replace_property_blob_from_id(dev,
> +					&state->ctm,
> +					val,
> +					sizeof(struct
> drm_color_ctm), -1,
> +					&replaced);
> +		state->color_mgmt_changed |= replaced;
> +		return ret;
>  	} else if (plane->funcs->atomic_set_property) {
>  		return plane->funcs->atomic_set_property(plane,
> state,
>  				property, val);
> @@ -988,6 +996,8 @@ static int drm_atomic_plane_set_property(struct
> drm_plane *plane,
>  	} else if (property == plane->degamma_lut_property) {
>  		*val = (state->degamma_lut) ?
>  			state->degamma_lut->base.id : 0;
> +	} else if (property == plane->ctm_property) {
> +		*val = (state->ctm) ? state->ctm->base.id : 0;
>  	} else if (plane->funcs->atomic_get_property) {
>  		return plane->funcs->atomic_get_property(plane,
> state, property, val);
>  	} else {
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c
> b/drivers/gpu/drm/drm_atomic_helper.c
> index 67c5b51..866181f 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -3616,6 +3616,9 @@ void
> __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
>  
>  	if (state->degamma_lut)
>  		drm_property_blob_get(state->degamma_lut);
> +	if (state->ctm)
> +		drm_property_blob_get(state->ctm);
> +
>  	state->color_mgmt_changed = false;
>  }
>  EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
> @@ -3663,6 +3666,7 @@ void
> __drm_atomic_helper_plane_destroy_state(struct drm_plane_state
> *state)
>  		drm_crtc_commit_put(state->commit);
>  
>  	drm_property_blob_put(state->degamma_lut);
> +	drm_property_blob_put(state->ctm);
>  }
>  EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
>  
> diff --git a/drivers/gpu/drm/drm_plane.c
> b/drivers/gpu/drm/drm_plane.c
> index 03e0560..97520b1 100644
> --- a/drivers/gpu/drm/drm_plane.c
> +++ b/drivers/gpu/drm/drm_plane.c
> @@ -489,6 +489,11 @@ int drm_mode_plane_set_obj_prop(struct drm_plane
> *plane,
>   *
>   * degamma_lut_size_property:
>   *	Range Property to indicate size of the plane degamma LUT.
> + *
> + * ctm_property:
> + *	Blob property which allows a userspace to provide CTM
> coefficients
> + *	to do color space conversion or any other enhancement by
> doing a
> + *	matrix multiplication using the h/w CTM processing engine
>   */
>  int drm_plane_color_create_prop(struct drm_device *dev,
>  				struct drm_plane *plane)
> @@ -509,6 +514,13 @@ int drm_plane_color_create_prop(struct
> drm_device *dev,
>  		return -ENOMEM;
>  	plane->degamma_lut_size_property = prop;
>  
> +	prop = drm_property_create(dev,
> +			DRM_MODE_PROP_BLOB,
> +			"PLANE_CTM", 0);
> +	if (!prop)
> +		return -ENOMEM;
> +	plane->ctm_property = prop;
> +
>  	return 0;
>  }
>  EXPORT_SYMBOL(drm_plane_color_create_prop);
> diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
> index 28357ac..5143277 100644
> --- a/include/drm/drm_plane.h
> +++ b/include/drm/drm_plane.h
> @@ -183,6 +183,14 @@ struct drm_plane_state {
>  	struct drm_property_blob *degamma_lut;
>  
>  	/**
> +	 * @ctm:
> +	 *
> +	 * Color transformation matrix. See
> drm_plane_enable_color_mgmt(). The
> +	 * blob (if not NULL) is a &struct drm_color_ctm.
> +	 */
> +	struct drm_property_blob *ctm;
> +
> +	/**
>  	 * @commit: Tracks the pending commit to prevent use-after-
> free conditions,
>  	 * and for async plane updates.
>  	 *
> @@ -698,6 +706,13 @@ struct drm_plane {
>  	 * size of the degamma LUT as supported by the driver (read-
> only).
>  	 */
>  	struct drm_property *degamma_lut_size_property;
> +
> +	/**
> +	 * @plane_ctm_property: Optional Plane property to set the
> +	 * matrix used to convert colors after the lookup in the
> +	 * degamma LUT.
> +	 */
> +	struct drm_property *ctm_property;
> 
I'm assuming degamma is done before converting with CTM.

But how does this interact with YUV formats? I'm not sure this is
explicitly defined. I'm assuming R->Cr G -> Y, B = Cb for degamma
tables.

There's also a enum drm_color_encoding and a enum drm_color_range. Are
these ignored if CTM is set? Would be good to mention at least.

~Maarten

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