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Change History

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode

Stop adjusting the horizontal timing values based on the
compression ratio in command mode. Bspec seems to be telling
us to do this only in video mode, and this is also how the
Windows driver does things.

This should also fix a div-by-zero on some machines because
the adjusted htotal ends up being so small that we end up with
line_time_us==0 when trying to determine the vtotal value in
command mode.

Note that this doesn't actually make the display on the
Huawei Matebook E work, but at least the kernel no longer
explodes when the driver loads.

(cherry picked from commit 0b475e91ecc2313207196c6d7fd5c53e1a878525)

https://git.kernel.org/stable/c/33b5336e4fd8ba0e40a12989cadb3f5534a0f9e4

https://git.kernel.org/stable/c/4dfce79e098915d8e5fc2b9e1d980bc3251dd32c

https://git.kernel.org/stable/c/55efe8402f46af8399c8b634a18b130a05fd7820

https://git.kernel.org/stable/c/86e926b108880c0109b8635e459450447156aeb7