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drm/display/dsc: Add flatness and initial scale value calculations 

Add helpers to calculate det_thresh_flatness and initial_scale_value as
these calculations are defined within the DSC spec.

Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539282/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-1-bafc7be95691@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Jessica Zhang 2023-05-24 10:45:14 -07:00 committed by Dmitry Baryshkov
parent c723751721
commit 7df1ed6ddf
2 changed files with 26 additions and 0 deletions
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24
drivers/gpu/drm/display/drm_dsc_helper.c
View File

@ -1413,3 +1413,27 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
return 0;
}
EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);
/**
* drm_dsc_initial_scale_value() - Calculate the initial scale value for the given DSC config
* @dsc: Pointer to DRM DSC config struct
*
* Return: Calculated initial scale value
*/
u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
{
return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
}
EXPORT_SYMBOL(drm_dsc_initial_scale_value);
/**
* drm_dsc_flatness_det_thresh() - Calculate the flatness_det_thresh for the given DSC config
* @dsc: Pointer to DRM DSC config struct
*
* Return: Calculated flatness det thresh value
*/
u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
{
return 2 << (dsc->bits_per_component - 8);
}
EXPORT_SYMBOL(drm_dsc_flatness_det_thresh);

2
include/drm/display/drm_dsc_helper.h
View File

@ -24,6 +24,8 @@ void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp,
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);
u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc);
u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc);
#endif /* _DRM_DSC_HELPER_H_ */