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| author | Patrick Georgi <patrick.georgi@secunet.com> | 2012-07-06 11:31:39 +0200 |
|---|---|---|
| committer | Peter Stuge <peter@stuge.se> | 2012-07-06 11:53:49 +0200 |
| commit | 6444bd4547802cc27e8830161341e68b1dcf0ba1 (patch) | |
| tree | ce9570f65fdc02c44df5b0fa954d29d92385d0b2 /src/northbridge | |
| parent | 3397ceff7b8a2453e4f045f32f2aaa5be1b2166d (diff) | |
| download | coreboot-6444bd4547802cc27e8830161341e68b1dcf0ba1.tar.xz | |
i945: Reset IGD on boot
This is mostly necessary for reboot, but it doesn't hurt the boot process.
On reboot explicitely reset the integrated graphics, otherwise the VGABIOS
might not be able to reinitialize it properly, and you either have a still
of the last pre-reboot image, garbage or an empty screen, but no text-mode.
Change-Id: Ic3d6932fbaf720d88daaac7e4b09c3c0b9f0b0e2
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1178
Tested-by: build bot (Jenkins)
Reviewed-by: Peter Stuge <peter@stuge.se>
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/intel/i945/gma.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/northbridge/intel/i945/gma.c b/src/northbridge/intel/i945/gma.c index 340ddcd3a1..b703a80e71 100644 --- a/src/northbridge/intel/i945/gma.c +++ b/src/northbridge/intel/i945/gma.c @@ -18,15 +18,25 @@ */ #include <console/console.h> +#include <delay.h> #include <device/device.h> #include <device/pci.h> #include <device/pci_ids.h> #include <pc80/mc146818rtc.h> +#define GDRST 0xc0 + static void gma_func0_init(struct device *dev) { u32 reg32; + /* Unconditionally reset graphics */ + pci_write_config8(dev, GDRST, 1); + udelay(50); + pci_write_config8(dev, GDRST, 0); + /* wait for device to finish */ + while (pci_read_config8(dev, GDRST) & 1) { }; + /* IGD needs to be Bus Master */ reg32 = pci_read_config32(dev, PCI_COMMAND); pci_write_config32(dev, PCI_COMMAND, reg32 | PCI_COMMAND_MASTER); |