Patch set updated for coreboot: ec4eb55 pit: disable LCD FETs before doing any graphics init

[Patrick Georgi]

Patrick Georgi ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4470

-gerrit

commit ec4eb55c697df8f868b0f26324200a162a6f29f0
Author: David Hendricks 
Date:   Thu Aug 1 19:09:21 2013 -0700

pit: disable LCD FETs before doing any graphics init

This ensures that the LCD FETs are off before we do graphics init.

FIXME: The location of the code is sub-optimal and should probably be
    done in romstage, but there are __PRE_RAM__ considerations to take
    into account.

Signed-off-by: David Hendricks

Change-Id: I0844030d0a0e51eee1d29f1762f0b495777268df
    Reviewed-on: https://gerrit.chromium.org/gerrit/64305
    Reviewed-by: Ronald G. Minnich 
    Commit-Queue: Ronald G. Minnich 
    Tested-by: Ronald G. Minnich 
---
 src/cpu/samsung/exynos5420/cpu.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/cpu/samsung/exynos5420/cpu.c b/src/cpu/samsung/exynos5420/cpu.c
index bda46de..5ff345e 100644
--- a/src/cpu/samsung/exynos5420/cpu.c
+++ b/src/cpu/samsung/exynos5420/cpu.c
@@ -33,6 +33,8 @@
 #include "usb.h"
 #include "chip.h"

+#include <ec/google/chromeec/ec.h>
+
 static unsigned int cpu_id;
 static unsigned int cpu_rev;

@@ -141,6 +143,17 @@ static void exynos_displayport_init(device_t dev, u32 lcdbase,
    mmio_resource(dev, 1, lcdbase/KiB, (fb_size + KiB - 1)/KiB);
 }

+static void tps65090_thru_ec_fet_disable(int index)
+{
+	uint8_t value = 0;
+
+	if (google_chromeec_i2c_xfer(0x48, 0xe + index, 1, &value, 1, 0)) {
+		printk(BIOS_ERR,
+		       "Error sending i2c pass through command to EC.\n");
+		return;
+	}
+}
+
 static void cpu_enable(device_t dev)
 {
    unsigned long fb_size = FB_SIZE_KB * KiB;
@@ -149,6 +162,14 @@ static void cpu_enable(device_t dev)
    ram_resource(dev, 0, RAM_BASE_KB, RAM_SIZE_KB - FB_SIZE_KB);
    mmio_resource(dev, 1, lcdbase / KiB, (fb_size + KiB - 1) / KiB);

+	/*
+	 * Disable LCD FETs before we do anything with the display.
+	 * FIXME(dhendrix): This is a gross hack and should be done
+	 * elsewhere (romstage?).
+	 */
+	tps65090_thru_ec_fet_disable(1);
+	tps65090_thru_ec_fet_disable(6);
+
    exynos_displayport_init(dev, lcdbase, fb_size);

set_cpu_id();