tree b1be38bb95973ee00f8ea372cdea0c7277e596e4
parent ebfb285085dbc3f20c21c579400499f1243459d4
author Felix Held <felix-coreboot@felixheld.de> 1716312155 +0200
committer Felix Held <felix-coreboot@felixheld.de> 1716556587 +0000

device/pci_rom: handle non-remapped VGA_BIOS_ID

While the SoC-level defaults for VGA_BIOS_ID are the expected correctly
remapped PCI VID/PID of the GPU which matches the PCI VID/DID inside the
VBIOS file, some mainboards override the VGA_BIOS_ID setting to the
non-remapped PCI ID. This resulted in coreboot not finding the VBIOS
file after commit 42f0396a1028 ("device/pci_rom: rework PCI ID remapping
in pci_rom_probe"). The proper solution would be to not override this
SoC-level config in neither the mainboard code nor some external config
file. This however requires adding/using some mechanism to tell SeaBIOS
which VBIOS image to use for the GPU device. Once this is implemented,
the SoC default for VGA_BIOS_ID shouldn't be overridden any more and
this patch can be reverted again.

This sort-of reverts parts of commit 42f0396a1028 ("device/pci_rom:
rework PCI ID remapping in pci_rom_probe"), but it still tries to find
the VBIOS image with the expected remapped PCI ID and only adds trying
the non-remapped PCI ID as a fallback when the file with the remapped
PCI ID doesn't exist and prints a notice in that case. Before the patch
referenced above, using the correct remapped PCI VID/DID resulted in a
warning about the CBFS file with the non-remapped name not being found,
but first checking the remapped version solves that problem.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I7cd8e2036250f4ca2239b04cd070bbf0778b13aa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82592
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>