On 16/05/2023 01:01, Marijn Suijten wrote:
On 2023-05-15 13:29:21, Jessica Zhang wrote:
<snip>
Const, as requested elsewhere. But this function is not used anywhere
in any of the series (because we replaced the usages with more sensible
member accesses like slice_chunk_size).
Acked.
I would prefer to keep this helper so that we have a way to easily get
BPP information from the DRM DSC config in the future, but if you'd
prefer we add this helper then, I'm also ok with that.
The inverse helper is available ad DSC_BPP in drm_dsc_helper.c. Perhaps
we can move the two variants to the header and define them uniformly?
This isn't MSM-specific it seems (i.e. the format supports fractional
bpp but no RC parameters appear to be defined for such a format yet).
I think DSC_BPP was removed (around v2 or v3 if I read changelog correctly).
As for the fraction-point BPP, I think AMD supports .5 bpp granularity,
see drivers/gpu/drm/amd/display/dc/dml/dsc/qp_tables.h
--
With best wishes
Dmitry
