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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 <siro@das-labor.org>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/11058
Tested-by: build bot (Jenkins)
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
This commit is contained in:
Patrick Rudolph 2015-07-28 07:51:10 +02:00 committed by Alexandru Gagniuc
parent 3660c0fc65
commit 2a510a7a86
1 changed files with 4 additions and 2 deletions
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6
src/northbridge/intel/sandybridge/early_init.c
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@ -155,6 +155,7 @@ static void sandybridge_setup_graphics(void)
void sandybridge_early_initialization(int chipset_type) void sandybridge_early_initialization(int chipset_type)
{ {
u32 capid0_a; u32 capid0_a;
u32 deven;
u8 reg8; u8 reg8;
/* Device ID Override Enable should be done very early */ /* 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 */ /* Setup all BARs required for early PCIe and raminit */
sandybridge_setup_bars(); sandybridge_setup_bars();
/* Device Enable */ /* Device Enable, don't touch PEG bits */
pci_write_config32(PCI_DEV(0, 0, 0), DEVEN, DEVEN_HOST | DEVEN_IGD); 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(); sandybridge_setup_graphics();
} }