| Message ID | 20230329-rfc-msm-dsc-helper-v9-1-87daeaec2c0a@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce MSM-specific DSC helpers | expand |
On Wed, May 10, 2023 at 03:54:41PM -0700, Jessica Zhang wrote: > Add helpers to calculate det_thresh_flatness and initial_scale_value as > these calculations are defined within the DSC spec. > > Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com> > 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> > --- > include/drm/display/drm_dsc_helper.h | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h > index 0bb0c3afd740..422135a33d65 100644 > --- a/include/drm/display/drm_dsc_helper.h > +++ b/include/drm/display/drm_dsc_helper.h > @@ -25,5 +25,16 @@ 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); > > +static inline void drm_dsc_set_initial_scale_value(struct drm_dsc_config *dsc) > +{ > + dsc->initial_scale_value = 8 * dsc->rc_model_size / > + (dsc->rc_model_size - dsc->initial_offset); > +} I would suggest using pure functions whenever possible. Makes it much easier to reason about the code when you know there are no side effects. > + > +static inline int drm_dsc_calculate_flatness_det_thresh(struct drm_dsc_config *dsc) 'dsc' can be const. The word "calculate" seems pretty much redundant. > +{ > + return 2 << (dsc->bits_per_component - 8); > +} > + > #endif /* _DRM_DSC_HELPER_H_ */ > > > -- > 2.40.1
diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h index 0bb0c3afd740..422135a33d65 100644 --- a/include/drm/display/drm_dsc_helper.h +++ b/include/drm/display/drm_dsc_helper.h @@ -25,5 +25,16 @@ 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); +static inline void drm_dsc_set_initial_scale_value(struct drm_dsc_config *dsc) +{ + dsc->initial_scale_value = 8 * dsc->rc_model_size / + (dsc->rc_model_size - dsc->initial_offset); +} + +static inline int drm_dsc_calculate_flatness_det_thresh(struct drm_dsc_config *dsc) +{ + return 2 << (dsc->bits_per_component - 8); +} + #endif /* _DRM_DSC_HELPER_H_ */