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[ Upstream commitbc6b6ff813] According to downstream the value to use for WORD_COUNT is bytes_per_pkt, which denotes the number of bytes in a packet based on how many slices have been configured by the panel driver times the width of a slice times the number of bytes per pixel. The DSC panels seen thus far use one byte per pixel, only one slice per packet, and a slice width of half the panel width leading to the desired bytes_per_pkt+1 value to be equal to hdisplay/2+1. This however isn't the case anymore for panels that configure two slices per packet, where the value should now be hdisplay+1. Note that the aforementioned panel (on a Sony Xperia XZ3, sdm845) with slice_count=1 has also been tested to successfully accept slice_count=2, which would have shown corrupted output previously. Fixes:08802f515c("drm/msm/dsi: Add support for DSC configuration") Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Patchwork: https://patchwork.freedesktop.org/patch/515694/ Link: https://lore.kernel.org/r/20221221231943.1961117-3-marijn.suijten@somainline.org Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Stable-dep-of:155fa3a91d("drm/msm/dsi: Remove incorrect references to slice_count") 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.