patch link:https://lore.kernel.org/r/20230418183325.2327-1-pa%40panix.com
patch subject: [PATCH] firmware/sysfb: Fix VESA format selection
config: x86_64-randconfig-a014-20230417
(https://download.01.org/0day-ci/archive/20230419/202304191058.frwrgyyd-...@intel.com/config)
compiler: clang
Some legacy BIOSes report no reserved bits in their 32-bit rgb mode,
breaking the calculation of bits_per_pixel in commit f35cd3fa7729
[firmware/sysfb: Fix EFI/VESA format selection]. However they report
lfb_depth correctly for those modes. Recompute bits_per_pixel from the
color and reserved
