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google/oak & elm: initialize touchscreen reset gpio 

In order to save power in S3, we remove reset gpio setting in kernel.
We still need to initialize touchscreen ic.
Do it by pulling low reset gpio for 500us and then pulling high
in firmware.

BRANCH=none
BUG=chrome-os-partner:55170
TEST=build on elm.

Change-Id: Idbe0175a1fc1fa0b05e81706194c79d52c6101f6
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: f40cc9a22c2551c2c9455cb8b60f36353602bca6
Original-Change-Id: If2ac815c4fd5c5ae15443348a49eb31449b724b1
Original-Signed-off-by: YH Huang <yh.huang@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/360312
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Johnny Chuang <johnny.chuang@emc.com.tw>
Reviewed-on: https://review.coreboot.org/15719
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
YH Huang 2016-07-14 11:49:01 +08:00 committed by Martin Roth
parent b4d3d09ded
commit 5d687add85
1 changed files with 11 additions and 0 deletions
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11
src/mainboard/google/oak/mainboard.c
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@ -66,6 +66,16 @@ static void configure_ext_buck(void)
}
}
static void configure_touchscreen(void)
{
/* Pull low reset gpio for 500us and then pull high */
if (board_id() + CONFIG_BOARD_ID_ADJUSTMENT >= 7) {
gpio_output(PAD_PCM_SYNC, 0);
udelay(500);
gpio_output(PAD_PCM_SYNC, 1);
}
}
static void configure_audio(void)
{
mtcmos_audio_power_on();
@ -252,6 +262,7 @@ static void mainboard_init(device_t dev)
configure_usb();
configure_usb_hub();
configure_ext_buck();
configure_touchscreen();
elog_init();
elog_add_watchdog_reset();