Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4195
-gerrit
commit 51dd82db1b38dec3577e3599895773181f687e72 Author: Duncan Laurie dlaurie@chromium.org Date: Tue May 28 07:49:09 2013 -0700
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 --- src/northbridge/intel/haswell/gma.c | 26 +++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/src/northbridge/intel/haswell/gma.c b/src/northbridge/intel/haswell/gma.c index f3ddbd3..467ed93 100644 --- a/src/northbridge/intel/haswell/gma.c +++ b/src/northbridge/intel/haswell/gma.c @@ -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;