[PATCH] pci: Handle 5-bit and 8-bit tag field

If the hardware supports extended tag field (8-bit ones), then enabled it. This is usually done by the VBIOS, but not on some MBPs (see fdo#86537). In case extended tag field is not supported, 5-bit tag field is used which limits the possible values to 32. Apparently bits 7:0 of 0x8841c stores

[PATCH] pci: Handle 5-bit and 8-bit tag field

If the hardware supports extended tag field (8-bit ones), then enabled it. This is usually done by the VBIOS, but not on some MBPs (see fdo#86537). In case extended tag field is not supported, 5-bit tag field is used which limits the possible values to 32. Apparently bits 7:0 of 0x8841c stores