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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 <dhendrix@chromium.org>

Change-Id: I0844030d0a0e51eee1d29f1762f0b495777268df
Reviewed-on: https://gerrit.chromium.org/gerrit/64305
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Commit-Queue: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Ronald G. Minnich <rminnich@chromium.org>
Reviewed-on: http://review.coreboot.org/4470
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
David Hendricks 2013-08-01 19:09:21 -07:00 committed by Patrick Georgi
parent 1ad77de62d
commit c81187f231
1 changed files with 21 additions and 0 deletions
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21
src/cpu/samsung/exynos5420/cpu.c
View File

@ -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();