From 2a510a7a8627526d9516998248dda9c762333391 Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Tue, 28 Jul 2015 07:51:10 +0200 Subject: [PATCH] northbridge/intel/sandybridge: Do not disable PEG by default Don't disable PEG bits while turning on IGD. Fixes PCI device enumeration of PEG devices. Test system: * Intel Pentium CPU G2130 * Gigabyte GA-B75M-D3H Sidenote: This should be taken from a CMOS option instead. Change-Id: I2d6522504e4404f2d57f9c319351d08317aefdcb Signed-off-by: Patrick Rudolph Signed-off-by: Alexandru Gagniuc Reviewed-on: http://review.coreboot.org/11058 Tested-by: build bot (Jenkins) Reviewed-by: Vladimir Serbinenko --- src/northbridge/intel/sandybridge/early_init.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c index e77cf22596..7b60ec7153 100644 --- a/src/northbridge/intel/sandybridge/early_init.c +++ b/src/northbridge/intel/sandybridge/early_init.c @@ -155,6 +155,7 @@ static void sandybridge_setup_graphics(void) void sandybridge_early_initialization(int chipset_type) { u32 capid0_a; + u32 deven; u8 reg8; /* Device ID Override Enable should be done very early */ @@ -172,8 +173,9 @@ void sandybridge_early_initialization(int chipset_type) /* Setup all BARs required for early PCIe and raminit */ sandybridge_setup_bars(); - /* Device Enable */ - pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, DEVEN_HOST | DEVEN_IGD); + /* Device Enable, don't touch PEG bits */ + deven = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN) | DEVEN_IGD; + pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, deven); sandybridge_setup_graphics(); }