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[ Upstream commitc3a1aabce2] As per the FIXME this code is entirely duplicate with what is already provided inside drm_dsc_compute_rc_parameters(), supposedly because that function was yielding "incorrect" results while in reality the panel driver(s?) used for testing were providing incorrect parameters. For example, this code from downstream assumed dsc->bits_per_pixel to contain an integer value, whereas the upstream drm_dsc_config struct stores it with 4 fractional bits. drm_dsc_compute_rc_parameters() already accounts for this feat while the panel driver used for testing [1] wasn't, hence making drm_dsc_compute_rc_parameters() seem like it was returning an incorrect result. Other users of dsc->bits_per_pixel inside dsi_populate_dsc_params() also treat it in the same erroneous way, and will be addressed in a separate patch. In the end, using drm_dsc_compute_rc_parameters() spares both a lot of duplicate code and erratic behaviour. [1]: https://git.linaro.org/people/vinod.koul/kernel.git/commit/?h=topic/pixel3_5.18-rc1&id=1d7d98ad564f1ec69e7525e07418918d90f247a1 Fixes:b9080324d6("drm/msm/dsi: add support for dsc data") Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Patchwork: https://patchwork.freedesktop.org/patch/508939/ Link: https://lore.kernel.org/r/20221026182824.876933-7-marijn.suijten@somainline.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.