CVE-2026-31767

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)