diff options
| author | Arthur Heymans <arthur@aheymans.xyz> | 2017-03-05 10:57:02 +0100 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2017-05-09 12:57:37 +0200 |
| commit | 5e3cb72a71920e52ad1cc0d315a00e59522190b2 (patch) | |
| tree | 3db8732a1c2fe7124e008d982e4be0b4510ff66e /src/northbridge | |
| parent | 2e7efe65a23570ba654187412052e7eb7583858f (diff) | |
nb/x4x: Do not enable IGD when not supported
According to "Intel ® 4 Series Chipset Family datasheet" in the
description about GGC and DEVEN, CAPID0 bit46 is said to reflect the
presence of an internal graphic device. This would allow the P43 and
P45 chipset variants to work.
Change-Id: Icdaa2862f82000de6d51278098365c63b7719f7f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18515
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/x4x/early_init.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/northbridge/intel/x4x/early_init.c b/src/northbridge/intel/x4x/early_init.c index a556adca0e..66bce7234c 100644 --- a/src/northbridge/intel/x4x/early_init.c +++ b/src/northbridge/intel/x4x/early_init.c @@ -27,6 +27,7 @@ void x4x_early_init(void) { + u8 gfxsize; const pci_devfn_t d0f0 = PCI_DEV(0, 0, 0); /* Setup MCHBAR. */ @@ -54,14 +55,20 @@ void x4x_early_init(void) pci_write_config8(d0f0, D0F0_PAM(5), 0x33); pci_write_config8(d0f0, D0F0_PAM(6), 0x33); - /* Enable internal GFX */ - pci_write_config32(d0f0, D0F0_DEVEN, BOARD_DEVEN); - /* Set preallocated IGD size from cmos */ - u8 gfxsize; - - if (get_option(&gfxsize, "gfx_uma_size") != CB_SUCCESS) { - /* 6 for 64MB, default if not set in cmos */ - gfxsize = 6; + if (!(pci_read_config32(d0f0, D0F0_CAPID0 + 4) & (1 << (46 - 32)))) { + /* Enable internal GFX */ + pci_write_config32(d0f0, D0F0_DEVEN, BOARD_DEVEN); + /* Set preallocated IGD size from cmos */ + + if (get_option(&gfxsize, "gfx_uma_size") != CB_SUCCESS) { + /* 6 for 64MB, default if not set in cmos */ + gfxsize = 6; + } + pci_write_config16(d0f0, D0F0_GGC, + 0x0100 | ((gfxsize + 1) << 4)); + } else { /* Does not feature internal graphics */ + pci_write_config32(d0f0, D0F0_DEVEN, D0EN | D1EN | PEG1EN); + pci_write_config16(d0f0, D0F0_GGC, (1 << 1)); } pci_write_config16(d0f0, D0F0_GGC, 0x0100 | ((gfxsize + 1) << 4)); } |