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haswell: Add magic to turn on grahpics in normal mode 

The haswell i915 kernel driver apparently expects the VBIOS
to set a few specific registers.  This sequence is enough to
make the driver happy without executing the VBIOS.

This also makes graphics work after suspend/resume.

Change-Id: I34937d55ffff8a9445442e6e6ca1bfc49869da63
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56806
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4195
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Duncan Laurie 2013-05-28 07:49:09 -07:00 committed by Stefan Reinauer
parent 22419e0456
commit c7f2ab742b
1 changed files with 21 additions and 5 deletions
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26
src/northbridge/intel/haswell/gma.c
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@ -131,17 +131,13 @@ static void gma_pm_init_pre_vbios(struct device *dev)
gtt_write(0x0a094, 0x00040000);
}
static void gma_pm_init_post_vbios(struct device *dev)
static void gma_setup_panel(struct device *dev)
{
struct northbridge_intel_haswell_config *conf = dev->chip_info;
u32 reg32;
printk(BIOS_DEBUG, "GT Power Management Init (post VBIOS)\n");
/* Disable Force Wake */
gtt_write(0x0a188, 0x00010000);
gtt_poll(0x130044, 1 << 0, 0 << 0);
/* Setup Digital Port Hotplug */
reg32 = gtt_read(0xc4030);
if (!reg32) {
@ -187,6 +183,22 @@ static void gma_pm_init_post_vbios(struct device *dev)
}
}
static void gma_pm_init_post_vbios(struct device *dev)
{
extern int oprom_is_loaded;
if (!oprom_is_loaded) {
/* Magic to force graphics into happy state for kernel */
gtt_write(0xc7204, 0xabcd000f); /* panel power up */
gtt_write(0x45400, 0x80000000); /* power well enable */
gtt_write(0x64000, 0x00000091); /* DDI-A enable */
}
/* Disable Force Wake */
gtt_write(0x0a188, 0x00010000);
gtt_poll(0x130044, 1 << 0, 0 << 0);
}
static void gma_func0_init(struct device *dev)
{
int lightup_ok = 0;
@ -203,9 +215,13 @@ static void gma_func0_init(struct device *dev)
* So it's almost like having two hardcodes.
*/
graphics_base = dev->resource_list[1].base;
/* Init graphics power management */
gma_pm_init_pre_vbios(dev);
/* Post VBIOS init */
gma_setup_panel(dev);
#if CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT
printk(BIOS_SPEW, "NATIVE graphics, run native enable\n");
u32 iobase, mmiobase, physbase;