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Commit7d8e9a9050("drm/msm/dsi: move DSI host powerup to modeset time") caused sc7180 Chromebooks that use the parade-ps8640 bridge chip to fail to turn the display back on after it turns off. Unfortunately, it doesn't look easy to fix the parade-ps8640 driver to handle the new power sequence. The Linux driver has almost nothing in it and most of the logic for this bridge chip is in black-box firmware that the bridge chip uses. Also unfortunately, reverting the patch will break "tc358762". The long term solution here is probably Dave Stevenson's series [1] that would give more flexibility. However, that is likely not a quick fix. For the short term, we'll look at the compatible of the next bridge in the chain and go back to the old way for the Parade PS8640 bridge chip. If it's found that other bridge chips also need this workaround then we can add them to the list or consider inverting the condition. However, the hope is that the framework will not take too much longer to land and we won't have to add anything other than ps8640 here. [1] https://lore.kernel.org/r/cover.1646406653.git.dave.stevenson@raspberrypi.com Fixes:7d8e9a9050("drm/msm/dsi: move DSI host powerup to modeset time") Suggested-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Link: https://lore.kernel.org/r/20220513131504.v5.1.Ia196e35ad985059e77b038a41662faae9e26f411@changeid Signed-off-by: Rob Clark <robdclark@chromium.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.