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drm/display/dsc: add helper to set semi-const parameters

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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@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539280/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-2-bafc7be95691@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Dmitry Baryshkov 2023-05-24 10:45:15 -07:00
parent 7df1ed6ddf
commit e871a70d8c
2 changed files with 23 additions and 0 deletions
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22
drivers/gpu/drm/display/drm_dsc_helper.c
View file

@ -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,

1
include/drm/display/drm_dsc_helper.h
View file

@ -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_type type);
int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);