[PATCH v7 2/8] drm/display/dsc: add helper to set semi-const parameters

[Marijn Suijten]

On 2023-05-09 15:06:48, Jessica Zhang wrote:
> From: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> 
> Add a helper setting config values which are typically constant across
> operating modes (table E-4 of the standard) and mux_word_size (which is
> a const according to 3.5.2).
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>

Same question about ordering.

Reviewed-by:  Marijn Suijten <marijn.suijten at somainline.org>

> ---
>  drivers/gpu/drm/display/drm_dsc_helper.c | 22 ++++++++++++++++++++++
>  include/drm/display/drm_dsc_helper.h     |  1 +
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c b/drivers/gpu/drm/display/drm_dsc_helper.c
> index 65e810a54257..b9c4e10ced41 100644
> --- a/drivers/gpu/drm/display/drm_dsc_helper.c
> +++ b/drivers/gpu/drm/display/drm_dsc_helper.c
> @@ -270,6 +270,28 @@ void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_payload,
>  }
>  EXPORT_SYMBOL(drm_dsc_pps_payload_pack);
>  
> +/**
> + * drm_dsc_set_const_params() - Set DSC parameters considered typically
> + * constant across operation modes
> + *
> + * @vdsc_cfg:
> + * DSC Configuration data partially filled by driver
> + */
> +void drm_dsc_set_const_params(struct drm_dsc_config *vdsc_cfg)
> +{
> +	if (!vdsc_cfg->rc_model_size)
> +		vdsc_cfg->rc_model_size = DSC_RC_MODEL_SIZE_CONST;
> +	vdsc_cfg->rc_edge_factor = DSC_RC_EDGE_FACTOR_CONST;
> +	vdsc_cfg->rc_tgt_offset_high = DSC_RC_TGT_OFFSET_HI_CONST;
> +	vdsc_cfg->rc_tgt_offset_low = DSC_RC_TGT_OFFSET_LO_CONST;
> +
> +	if (vdsc_cfg->bits_per_component <= 10)
> +		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
> +	else
> +		vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
> +}
> +EXPORT_SYMBOL(drm_dsc_set_const_params);
> +
>  /* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
>  static const u16 drm_dsc_rc_buf_thresh[] = {
>  	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
> index 422135a33d65..bfa7f3acafcb 100644
> --- a/include/drm/display/drm_dsc_helper.h
> +++ b/include/drm/display/drm_dsc_helper.h
> @@ -21,6 +21,7 @@ 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_const_params(struct drm_dsc_config *vdsc_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, enum drm_dsc_params_kind kind);
>  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
> 
> -- 
> 2.40.1
>