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soc/intel/skylake/acpi.c: Name devices on secondary bus 

Naming a device allows an ACPI _ROM method to be written for it. GPUs
may require this to make the configuration data contained within
available to an OS driver. This may be required for GPUs that do not
contain their vBIOS, or perhaps the drivers require it in this form/fashion.

Working on an Acer Aspire VN7-572G (Skylake-U). nouveau successfully
obtains the vBIOS via ACPI (kernel 5.7.11).

Change-Id: Ida87aebf8fdf341ab350c2bb3704d2ef695cf8f0
Signed-off-by: Benjamin Doron <benjamin.doron00@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43074
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Benjamin Doron 2020-08-06 19:13:09 +00:00 committed by Patrick Georgi
parent 6fd87ffe2e
commit 2875df1c9e
1 changed files with 8 additions and 2 deletions
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10
src/soc/intel/skylake/acpi.c
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@ -632,12 +632,18 @@ const char *soc_acpi_name(const struct device *dev)
if (dev->path.type != DEVICE_PATH_PCI)
return NULL;
/* Only match devices on the root bus */
if (dev->bus && dev->bus->secondary > 0)
/* Match functions 0 and 1 for possible GPUs on a secondary bus */
if (dev->bus && dev->bus->secondary > 0) {
switch (PCI_FUNC(dev->path.pci.devfn)) {
case 0: return "DEV0";
case 1: return "DEV1";
}
return NULL;
}
switch (dev->path.pci.devfn) {
case SA_DEVFN_ROOT: return "MCHC";
case SA_DEVFN_PEG0: return "PEGP";
case SA_DEVFN_IGD: return "GFX0";
case PCH_DEVFN_ISH: return "ISHB";
case PCH_DEVFN_XHCI: return "XHCI";