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veyron_danger: Turn on backlight enable before VCC_LCD 

On current Danger boards, VCC_LCD is gated by BL_EN. Thus we
need to enable BL_EN in order to power on the display so that
we can read the EDID and set things up.

Later board revisions may change this ordering, but for now it
doesn't seem to be causing a significant issues (no noticable
"snow" or other corruption using Pepto display).

BUG=none
BRANCH=none
TEST=booted on Danger, saw dev mode screen come up

Change-Id: I70aab8c1f6da2d0fce310d59073026eef0f67821
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 1a918824e747600a2f3a88602320f4f563ce17b7
Original-Signed-off-by: David Hendricks <dhendrix@chromium.org>
Original-Change-Id: Iaf17cc4682bd3c46f62cba789e3ecf8d5a474362
Original-Reviewed-on: https://chromium-review.googlesource.com/266913
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/10089
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
This commit is contained in:
David Hendricks 2015-04-22 15:05:18 -07:00 committed by Patrick Georgi
parent 9ac9ac6309
commit c3b0e29b43
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/mainboard/google/veyron_danger/board.h
View File

@ -25,6 +25,7 @@
#define GPIO_BACKLIGHT GPIO(7, A, 3)
#define GPIO_RESET GPIO(0, B, 5)
#define GPIO_LCDC_BL GPIO(7, A, 7)
void setup_chromeos_gpios(void);

13
src/mainboard/google/veyron_danger/mainboard.c
View File

@ -93,6 +93,17 @@ static void configure_vop(void)
/* lcdc(vop) iodomain select 1.8V */
write32(&rk3288_grf->io_vsel, RK_SETBITS(1 << 0));
/*
* BL_EN gates VCC_LCD. This might be changed in future revisions
* of the board so that the display can be stablized before we
* turn on the backlight.
*
* To minimize display corruption, turn off LCDC_BL before
* powering on the backlight.
*/
gpio_output(GPIO_BACKLIGHT, 1); /* BL_EN */
gpio_output(GPIO_LCDC_BL, 0);
rk808_configure_switch(2, 1); /* VCC18_LCD (HDMI_AVDD_1V8) */
rk808_configure_ldo(7, 1000); /* VDD10_LCD (HDMI_AVDD_1V0) */
rk808_configure_switch(1, 1); /* VCC33_LCD */
@ -135,5 +146,5 @@ void lb_board(struct lb_header *header)
void mainboard_power_on_backlight(void)
{
gpio_output(GPIO_BACKLIGHT, 1); /* BL_EN */
gpio_output(GPIO_LCDC_BL, 1);
}