Re: [PATCH 36/36] drm/amd/display: allow newer DC hardware to use degamma ROM for PQ/HLG

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On 5/23/23 18:15, Melissa Wen wrote:
> From: Joshua Ashton <joshua@xxxxxxxxx>
> 
> Need to funnel the color caps through to these functions so it can check
> that the hardware is capable.
> 
> Signed-off-by: Joshua Ashton <joshua@xxxxxxxxx>
> Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx>
> ---
>  .../amd/display/amdgpu_dm/amdgpu_dm_color.c   | 35 ++++++++++++-------
>  1 file changed, 23 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> index 4a2b66568451..714f07bb9c9c 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
> @@ -338,6 +338,7 @@ static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
>  /**
>   * __set_input_tf - calculates the input transfer function based on expected
>   * input space.
> + * @caps: dc color capabilities
>   * @func: transfer function
>   * @lut: lookup table that defines the color space
>   * @lut_size: size of respective lut.
> @@ -345,7 +346,7 @@ static int amdgpu_dm_set_atomic_regamma(struct dc_stream_state *stream,
>   * Returns:
>   * 0 in case of success. -ENOMEM if fails.
>   */
> -static int __set_input_tf(struct dc_transfer_func *func,
> +static int __set_input_tf(struct dc_color_caps *caps, struct dc_transfer_func *func,
>  			  const struct drm_color_lut *lut, uint32_t lut_size)
>  {
>  	struct dc_gamma *gamma = NULL;
> @@ -362,7 +363,7 @@ static int __set_input_tf(struct dc_transfer_func *func,
>  		__drm_lut_to_dc_gamma(lut, gamma, false);
>  	}
>  
> -	res = mod_color_calculate_degamma_params(NULL, func, gamma, gamma != NULL);
> +	res = mod_color_calculate_degamma_params(caps, func, gamma, gamma != NULL);
>  
>  	if (gamma)
>  		dc_gamma_release(&gamma);
> @@ -511,7 +512,7 @@ static int amdgpu_dm_atomic_blend_lut(const struct drm_color_lut *blend_lut,
>  		func_blend->tf = tf;
>  		func_blend->sdr_ref_white_level = SDR_WHITE_LEVEL_INIT_VALUE;
>  
> -		ret = __set_input_tf(func_blend, blend_lut, blend_size);
> +		ret = __set_input_tf(NULL, func_blend, blend_lut, blend_size);
>  	} else {
>  		func_blend->type = TF_TYPE_BYPASS;
>  		func_blend->tf = TRANSFER_FUNCTION_LINEAR;
> @@ -818,7 +819,8 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc,
>  
>  static int
>  map_crtc_degamma_to_dc_plane(struct dm_crtc_state *crtc,
> -			     struct dc_plane_state *dc_plane_state)
> +			     struct dc_plane_state *dc_plane_state,
> +			     struct dc_color_caps *caps)
>  {
>  	const struct drm_color_lut *degamma_lut;
>  	enum dc_transfer_func_predefined tf = TRANSFER_FUNCTION_SRGB;
> @@ -873,7 +875,7 @@ map_crtc_degamma_to_dc_plane(struct dm_crtc_state *crtc,
>  			dc_plane_state->in_transfer_func->tf =
>  				TRANSFER_FUNCTION_LINEAR;
>  
> -		r = __set_input_tf(dc_plane_state->in_transfer_func,
> +		r = __set_input_tf(caps, dc_plane_state->in_transfer_func,
>  				   degamma_lut, degamma_size);
>  		if (r)
>  			return r;
> @@ -886,7 +888,7 @@ map_crtc_degamma_to_dc_plane(struct dm_crtc_state *crtc,
>  		dc_plane_state->in_transfer_func->tf = tf;
>  
>  		if (tf != TRANSFER_FUNCTION_SRGB &&
> -		    !mod_color_calculate_degamma_params(NULL,
> +		    !mod_color_calculate_degamma_params(caps,
>  							dc_plane_state->in_transfer_func,
>  							NULL, false))
>  			return -ENOMEM;
> @@ -897,7 +899,8 @@ map_crtc_degamma_to_dc_plane(struct dm_crtc_state *crtc,
>  
>  static int
>  __set_dm_plane_degamma(struct drm_plane_state *plane_state,
> -		       struct dc_plane_state *dc_plane_state)
> +		       struct dc_plane_state *dc_plane_state,
> +		       struct dc_color_caps *color_caps)
>  {
>  	struct dm_plane_state *dm_plane_state = to_dm_plane_state(plane_state);
>  	const struct drm_color_lut *degamma_lut;
> @@ -906,6 +909,9 @@ __set_dm_plane_degamma(struct drm_plane_state *plane_state,
>  	bool has_degamma_lut;
>  	int ret;
>  
> +	if (dc_plane_state->ctx && dc_plane_state->ctx->dc)
> +		color_caps = &dc_plane_state->ctx->dc->caps.color;
> +

We already do this in amdgpu_dm_update_plane_color_mgmt and pass color_caps
into this function. We shouldn't need to do this here again.

Harry

>  	degamma_lut = __extract_blob_lut(dm_plane_state->degamma_lut,
>  					 &degamma_size);
>  
> @@ -928,7 +934,7 @@ __set_dm_plane_degamma(struct drm_plane_state *plane_state,
>  		dc_plane_state->in_transfer_func->type =
>  			TF_TYPE_DISTRIBUTED_POINTS;
>  
> -		ret = __set_input_tf(dc_plane_state->in_transfer_func,
> +		ret = __set_input_tf(color_caps, dc_plane_state->in_transfer_func,
>  				     degamma_lut, degamma_size);
>  		if (ret)
>  			return ret;
> @@ -945,7 +951,8 @@ __set_dm_plane_degamma(struct drm_plane_state *plane_state,
>  
>  static int
>  amdgpu_dm_plane_set_color_properties(struct drm_plane_state *plane_state,
> -				     struct dc_plane_state *dc_plane_state)
> +				     struct dc_plane_state *dc_plane_state,
> +				     struct dc_color_caps *color_caps)
>  {
>  	struct dm_plane_state *dm_plane_state = to_dm_plane_state(plane_state);
>  	enum drm_transfer_function shaper_tf = DRM_TRANSFER_FUNCTION_DEFAULT;
> @@ -1013,9 +1020,13 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
>  				      struct drm_plane_state *plane_state,
>  				      struct dc_plane_state *dc_plane_state)
>  {
> +	struct dc_color_caps *color_caps = NULL;
>  	bool has_crtc_cm_degamma;
>  	int ret;
>  
> +	if (dc_plane_state->ctx && dc_plane_state->ctx->dc)
> +		color_caps = &dc_plane_state->ctx->dc->caps.color;
> +
>  	/* Initially, we can just bypass the DGM block. */
>  	dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;
>  	dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;
> @@ -1023,7 +1034,7 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
>  	/* After, we start to update values according to color props */
>  	has_crtc_cm_degamma = (crtc->cm_has_degamma || crtc->cm_is_degamma_srgb);
>  
> -	ret = __set_dm_plane_degamma(plane_state, dc_plane_state);
> +	ret = __set_dm_plane_degamma(plane_state, dc_plane_state, color_caps);
>  	if (ret == -ENOMEM)
>  		return ret;
>  
> @@ -1049,11 +1060,11 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
>  		 * linearize (implicit degamma) from sRGB/BT709 according to
>  		 * the input space.
>  		 */
> -		ret = map_crtc_degamma_to_dc_plane(crtc, dc_plane_state);
> +		ret = map_crtc_degamma_to_dc_plane(crtc, dc_plane_state, color_caps);
>  		if (ret)
>  			return ret;
>  	}
>  
>  	return amdgpu_dm_plane_set_color_properties(plane_state,
> -						    dc_plane_state);
> +						    dc_plane_state, color_caps);
>  }




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