Commit e871a70d authored by Dmitry Baryshkov's avatar Dmitry Baryshkov
Browse files

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



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: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: default avatarMarijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: default avatarJessica 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: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent 7df1ed6d

drivers/gpu/drm/display/drm_dsc_helper.c

+22 −0
Original line number Diff line number Diff line
@@ -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,

include/drm/display/drm_dsc_helper.h

+1 −0
Original line number Diff line number Diff line
@@ -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);