Change in coreboot[master]: soc/intel/skylake/acpi.c: Name devices on secondary bus

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/43074 )

Change subject: soc/intel/skylake/acpi.c: Name devices on secondary bus
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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 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43074
Tested-by: build bot (Jenkins) 
Reviewed-by: Patrick Rudolph 
---
M src/soc/intel/skylake/acpi.c
1 file changed, 8 insertions(+), 2 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Patrick Rudolph: Looks good to me, approved

diff --git a/src/soc/intel/skylake/acpi.c b/src/soc/intel/skylake/acpi.c
index ae9d784..0ec6e47 100644
--- a/src/soc/intel/skylake/acpi.c
+++ b/src/soc/intel/skylake/acpi.c
@@ -632,12 +632,18 @@
    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";