New patch to review for coreboot: b4f191f haswell: Add magic to turn on grahpics in normal mode

[Stefan Reinauer]

Stefan Reinauer ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4195

-gerrit

commit b4f191f97f9a362ab748b321045cc7b15b081786
Author: Duncan Laurie 
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 
    Reviewed-on: https://gerrit.chromium.org/gerrit/56806
    Reviewed-by: Aaron Durbin 
---
 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;