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| author | Patrick Georgi <patrick.georgi@secunet.com> | 2012-07-20 12:37:06 +0200 |
|---|---|---|
| committer | Patrick Georgi <patrick@georgi-clan.de> | 2012-07-22 17:01:29 +0200 |
| commit | ce6e9fed2e1e0e5a493d1133caf5c6b9f713b7fc (patch) | |
| tree | 91fd69f30448aab5e7cf777374a868a49b9ec243 /src/northbridge | |
| parent | a555e55d15298da56f6752d01e4f8a04ae1a4eb8 (diff) | |
| download | coreboot-ce6e9fed2e1e0e5a493d1133caf5c6b9f713b7fc.tar.xz | |
i945: Disable IGD if plugin VGA is preferred
It's shut down, but UMA memory is not reclaimed. A later extension
could optionally do the magic register dance that allows initialization
of IGD as secondary graphics device.
Change-Id: I2a92bb71755005b886a8e1825325c678a9991bf2
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1252
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/i945/gma.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c index b703a80e71..bf381b832b 100644 --- a/src/northbridge/intel/i945/gma.c +++ b/src/northbridge/intel/i945/gma.c @@ -23,6 +23,7 @@ #include <device/pci.h> #include <device/pci_ids.h> #include <pc80/mc146818rtc.h> +#include "i945.h" #define GDRST 0xc0 @@ -44,6 +45,22 @@ static void gma_func0_init(struct device *dev) pci_dev_init(dev); } +/* This doesn't reclaim stolen UMA memory, but IGD could still + be reenabled later. */ +static void gma_func0_disable(struct device *dev) +{ + struct device *dev_host = dev_find_slot(0, PCI_DEVFN(0x0, 0)); + + pci_write_config16(dev, GCFC, 0xa00); + pci_write_config16(dev_host, GGC, (1 << 1)); + + unsigned int reg32 = pci_read_config32(dev_host, DEVEN); + reg32 &= ~(DEVEN_D2F0 | DEVEN_D2F1); + pci_write_config32(dev_host, DEVEN, reg32); + + dev->enabled = 0; +} + static void gma_func1_init(struct device *dev) { u32 reg32; @@ -82,6 +99,7 @@ static struct device_operations gma_func0_ops = { .init = gma_func0_init, .scan_bus = 0, .enable = 0, + .disable = gma_func0_disable, .ops_pci = &gma_pci_ops, }; |