On 2023-05-17 11:51:11, Jessica Zhang wrote:
> From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Reviewed-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
> Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
> ---
> 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 528dfb5e25fc..ea99b0b90674 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);
Dmitry changed this to `type` in "drm/i915: move DSC RC tables to
drm_dsc_helper.c" v6/7, hope that's not going to give context conflicts
on a strict apply/merge.
- Marijn
> int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
>
> --
> 2.40.1
>
