RE: [PATCH v5 6/8] drm/display/dsc: split DSC 1.2 and DSC 1.1 (pre-SCR) parameters

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> Subject: [PATCH v5 6/8] drm/display/dsc: split DSC 1.2 and DSC 1.1 (pre-SCR)
> parameters
> 
> The array of rc_parameters contains a mixture of parameters from DSC 1.1
> and DSC 1.2 standards. Split these tow configuration arrays in preparation to
> adding more configuration data.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/display/drm_dsc_helper.c  | 127 ++++++++++++++++++----
> drivers/gpu/drm/i915/display/intel_vdsc.c |  10 +-
>  include/drm/display/drm_dsc_helper.h      |   7 +-
>  3 files changed, 119 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c
> b/drivers/gpu/drm/display/drm_dsc_helper.c
> index acb93d4116e0..35b39f3109c4 100644
> --- a/drivers/gpu/drm/display/drm_dsc_helper.c
> +++ b/drivers/gpu/drm/display/drm_dsc_helper.c
> @@ -324,11 +324,81 @@ struct rc_parameters_data {
> 
>  #define DSC_BPP(bpp)	((bpp) << 4)
> 

Maybe  comment here mentioning the DSC version and the C Model
we follow would be useful

> +static const struct rc_parameters_data rc_parameters_pre_scr[] = {
> +	{
> +		.bpp = DSC_BPP(8), .bpc = 8,
> +		{ 512, 12, 6144, 3, 12, 11, 11, {
> +			{ 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
> +			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> +			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
> +			{ 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> +			}
> +		}
> +	},
> +	{
> +		.bpp = DSC_BPP(8), .bpc = 10,
> +		{ 512, 12, 6144, 7, 16, 15, 15, {
> +			/*
> +			 * DSC model/pre-SCR-cfg has 8 for
> range_max_qp[0], however
> +			 * VESA DSC 1.1 Table E-5 sets it to 4.
> +			 */
> +			{ 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
> +			{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> +			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> +			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> +			}
> +		}
> +	},
> +	{
> +		.bpp = DSC_BPP(8), .bpc = 12,
> +		{ 512, 12, 6144, 11, 20, 19, 19, {
> +			{ 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
> +			{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> +			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> +			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> +			{ 21, 23, -12 }
> +			}
> +		}
> +	},
> +	{
> +		.bpp = DSC_BPP(12), .bpc = 8,
> +		{ 341, 15, 2048, 3, 12, 11, 11, {
> +			{ 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
> +			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> +			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
> +			{ 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> +			}
> +		}
> +	},
> +	{
> +		.bpp = DSC_BPP(12), .bpc = 10,
> +		{ 341, 15, 2048, 7, 16, 15, 15, {
> +			{ 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
> +			{ 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> +			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> +			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> +			}
> +		}
> +	},
> +	{
> +		.bpp = DSC_BPP(12), .bpc = 12,
> +		{ 341, 15, 2048, 11, 20, 19, 19, {
> +			{ 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
> +			{ 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> +			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> +			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> +			{ 21, 23, -12 }
> +			}
> +		}
> +	},
> +	{ /* sentinel */ }
> +};
> +
>  /*
>   * Selected Rate Control Related Parameter Recommended Values
>   * from DSC_v1.11 spec & C Model release: DSC_model_20161212
>   */

The above comment shouldn't be above this function anymore since
This represent dsc_v1.2 I presume maybe move this comment above
and add a new comment for this function.

> -static const struct rc_parameters_data rc_parameters[] = {
> +static const struct rc_parameters_data rc_parameters_1_2_444[] = {
>  	{
>  		.bpp = DSC_BPP(6), .bpc = 8,
>  		{ 768, 15, 6144, 3, 13, 11, 11, {
> @@ -388,22 +458,18 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  		{ 512, 12, 6144, 3, 12, 11, 11, {
>  			{ 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
>  			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> -			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
> -			{ 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> +			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 10, -10 }, { 5, 11, -12 },
> +			{ 5, 11, -12 }, { 9, 12, -12 }, { 12, 13, -12 }
>  			}
>  		}
>  	},
>  	{
>  		.bpp = DSC_BPP(8), .bpc = 10,
>  		{ 512, 12, 6144, 7, 16, 15, 15, {
> -			/*
> -			 * DSC model/pre-SCR-cfg has 8 for
> range_max_qp[0], however
> -			 * VESA DSC 1.1 Table E-5 sets it to 4.
> -			 */
> -			{ 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
> +			{ 0, 8, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
>  			{ 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> -			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> -			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> +			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 14, -10 }, { 9, 15, -12 },
> +			{ 9, 15, -12 }, { 13, 16, -12 }, { 16, 17, -12 }
>  			}
>  		}
>  	},
> @@ -412,9 +478,9 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  		{ 512, 12, 6144, 11, 20, 19, 19, {
>  			{ 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
>  			{ 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> -			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> -			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> -			{ 21, 23, -12 }
> +			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 18, -10 },
> +			{ 13, 19, -12 }, { 13, 19, -12 }, { 17, 20, -12 },
> +			{ 20, 21, -12 }
>  			}
>  		}
>  	},
> @@ -498,8 +564,8 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  		{ 341, 15, 2048, 3, 12, 11, 11, {
>  			{ 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
>  			{ 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
> -			{ 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
> -			{ 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
> +			{ 3, 8, -8 }, { 3, 9, -10 }, { 5, 9, -10 }, { 5, 9, -12 },
> +			{ 5, 9, -12 }, { 7, 10, -12 }, { 10, 11, -12 }
>  			}
>  		}
>  	},
> @@ -508,8 +574,8 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  		{ 341, 15, 2048, 7, 16, 15, 15, {
>  			{ 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
>  			{ 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
> -			{ 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
> -			{ 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
> +			{ 7, 12, -8 }, { 7, 13, -10 }, { 9, 13, -10 }, { 9, 13, -12 },
> +			{ 9, 13, -12 }, { 11, 14, -12 }, { 14, 15, -12 }
>  			}
>  		}
>  	},
> @@ -518,9 +584,9 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  		{ 341, 15, 2048, 11, 20, 19, 19, {
>  			{ 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
>  			{ 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
> -			{ 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
> -			{ 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
> -			{ 21, 23, -12 }
> +			{ 11, 16, -8 }, { 11, 17, -10 }, { 13, 17, -10 },
> +			{ 13, 17, -12 }, { 13, 17, -12 }, { 15, 18, -12 },
> +			{ 18, 19, -12 }
>  			}
>  		}
>  	},
> @@ -602,7 +668,8 @@ static const struct rc_parameters_data
> rc_parameters[] = {
>  	{ /* sentinel */ }
>  };
> 
> -static const struct rc_parameters *get_rc_params(u16 dsc_bpp,
> +static const struct rc_parameters *get_rc_params(const struct
> rc_parameters_data *rc_parameters,
> +						 u16 dsc_bpp,
>  						 u8 bits_per_component)
>  {
>  	int i;
> @@ -622,11 +689,13 @@ static const struct rc_parameters
> *get_rc_params(u16 dsc_bpp,
>   * function.
>   *
>   * @vdsc_cfg: DSC Configuration data partially filled by driver
> + * @kind: operating mode and standard to follow
>   *
>   * Return: 0 or -error code in case of an error
>   */
> -int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg)
> +int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum
> +drm_dsc_params_kind kind)
>  {
> +	const struct rc_parameters_data *data;
>  	const struct rc_parameters *rc_params;
>  	int i;
> 
> @@ -634,7 +703,19 @@ int drm_dsc_setup_rc_params(struct
> drm_dsc_config *vdsc_cfg)
>  			 !vdsc_cfg->bits_per_component))
>  		return -EINVAL;
> 
> -	rc_params = get_rc_params(vdsc_cfg->bits_per_pixel,
> +	switch (kind) {
> +	case DRM_DSC_1_2_444:
> +		data = rc_parameters_1_2_444;
> +		break;
> +	case DRM_DSC_1_1_PRE_SCR:
> +		data = rc_parameters_pre_scr;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	rc_params = get_rc_params(data,
> +				  vdsc_cfg->bits_per_pixel,
>  				  vdsc_cfg->bits_per_component);
>  	if (!rc_params)
>  		return -EINVAL;
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c
> b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index d4340b18c18d..bd9116d2cd76 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -226,7 +226,15 @@ int intel_dsc_compute_params(struct
> intel_crtc_state *pipe_config)
>  	if (DISPLAY_VER(dev_priv) >= 13) {
>  		calculate_rc_params(vdsc_cfg);
>  	} else {
> -		ret = drm_dsc_setup_rc_params(vdsc_cfg);
> +		if ((compressed_bpp == 8 ||
> +		     compressed_bpp == 12) &&
> +		    (vdsc_cfg->bits_per_component == 8 ||
> +		     vdsc_cfg->bits_per_component == 10 ||
> +		     vdsc_cfg->bits_per_component == 12))
> +			ret = drm_dsc_setup_rc_params(vdsc_cfg,
> DRM_DSC_1_1_PRE_SCR);
> +		else
> +			ret = drm_dsc_setup_rc_params(vdsc_cfg,
> DRM_DSC_1_2_444);
> +
>  		if (ret)
>  			return ret;
> 
> diff --git a/include/drm/display/drm_dsc_helper.h
> b/include/drm/display/drm_dsc_helper.h
> index 1681791f65a5..c634bb2935d3 100644
> --- a/include/drm/display/drm_dsc_helper.h
> +++ b/include/drm/display/drm_dsc_helper.h
> @@ -10,12 +10,17 @@
> 
>  #include <drm/display/drm_dsc.h>
> 
> +enum drm_dsc_params_kind {
> +	DRM_DSC_1_2_444,
> +	DRM_DSC_1_1_PRE_SCR, /* legacy params from DSC 1.1 */ };
> +

Nit: can we rename this to drm_dsc_param_type rather than kind 
>  void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header);  int
> drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size);
> void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set
> *pps_sdp,
>  			      const struct drm_dsc_config *dsc_cfg);  void
> drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg); -int
> drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg);
> +int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum
> +drm_dsc_params_kind kind);
>  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
> 
>  #endif /* _DRM_DSC_HELPER_H_ */
> --
> 2.39.2





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