diff options
Diffstat (limited to 'src/drivers/intel/gma/opregion.c')
| -rw-r--r-- | src/drivers/intel/gma/opregion.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/drivers/intel/gma/opregion.c b/src/drivers/intel/gma/opregion.c index 74c629c9c2..b939b88324 100644 --- a/src/drivers/intel/gma/opregion.c +++ b/src/drivers/intel/gma/opregion.c @@ -32,6 +32,7 @@ void intel_gma_opregion_register(uintptr_t opregion) { device_t igd; u16 reg16; + u16 sci_reg; igd = dev_find_slot(0, PCI_DEVFN(0x2, 0)); if (!igd || !igd->enabled) @@ -44,14 +45,23 @@ void intel_gma_opregion_register(uintptr_t opregion) pci_write_config32(igd, ASLS, opregion); /* + * Atom-based platforms use a combined SMI/SCI register, + * whereas non-Atom platforms use a separate SCI register. + */ + if (IS_ENABLED(CONFIG_INTEL_GMA_SWSMISCI)) + sci_reg = SWSMISCI; + else + sci_reg = SWSCI; + + /* * Intel's Windows driver relies on this: * Intel BIOS Specification * Chapter 5.4 "ASL Software SCI Handler" */ - reg16 = pci_read_config16(igd, SWSCI); + reg16 = pci_read_config16(igd, sci_reg); reg16 &= ~GSSCIE; reg16 |= SMISCISEL; - pci_write_config16(igd, SWSCI, reg16); + pci_write_config16(igd, sci_reg, reg16); } /* Restore ASLS register on S3 resume and prepare SWSCI. */ |