[PATCH v11 1/9] drm/display/dsc: Add flatness and initial scale value calculations

[Marijn Suijten]

On 2023-05-17 14:32:42, Jessica Zhang wrote:
> 
> 
> On 5/17/2023 2:13 PM, Marijn Suijten wrote:
> > On 2023-05-17 11:51:10, 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 at quicinc.com>
> > 
> > Was this r-b dropped because of changing the return types in v10->v11?
> 
> Hi Marijn,
> 
> Yea. I'm not sure what the protocol is for keeping/dropping r-b tags, so 
> dropped the r-b because I wasn't sure if the change counted as significant.

Yeah, seems to be standard practice on nontrivial changes but in this
case I left a review on a patch that already has my r-b, and you changed
exactly what I requested.  Probably fine either way.

- Marijn

> 
> Thanks,
> 
> Jessica Zhang
> 
> > 
> > Reviewed-by: Marijn Suijten <marijn.suijten at somainline.org>
> > 
> >> ---
> >>   include/drm/display/drm_dsc_helper.h | 10 ++++++++++
> >>   1 file changed, 10 insertions(+)
> >>
> >> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
> >> index 0bb0c3afd740..528dfb5e25fc 100644
> >> --- a/include/drm/display/drm_dsc_helper.h
> >> +++ b/include/drm/display/drm_dsc_helper.h
> >> @@ -25,5 +25,15 @@ 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 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);
> >> +}
> >> +
> >> +static inline u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
> >> +{
> >> +	return 2 << (dsc->bits_per_component - 8);
> >> +}
> >> +
> >>   #endif /* _DRM_DSC_HELPER_H_ */
> >>   
> >>
> >> -- 
> >> 2.40.1
> >>