GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mb/google/kukui: Fix LCD sequence T3 fail issue 

The T3 that PPVARN_LCD low to LCM_RST_1V8 high is 0.1269ms and
it does not meet the LCD specification that the T3 must be larger
than 5ms. Because there is a delay between PPVARN_LCD_EN and
PPVARN_LCD. An extra 9ms delay should be added on LCM_RST_1V8
in order to meet the specification "ProductSpec_NV105WUM-A51_
V4.3_P2(TLCM).pdf".

BUG=b:172201138
BRANCH=kukui
TEST=The LCD sequence T3 is larger than 5ms when power on.

Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: Iaf7ae494e30c4c207103d949287b335288688c54
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47443
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Tao Xia 2020-11-11 15:32:46 +08:00 committed by Hung-Te Lin
parent 17cd905828
commit f3c0a01dc6
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/mainboard/google/kukui/mainboard.c
View File

@ -91,7 +91,7 @@ static void power_on_panel(struct panel_description *panel)
gpio_output(GPIO_PPVARN_LCD_EN, 1); gpio_output(GPIO_PPVARN_LCD_EN, 1);
gpio_output(GPIO_PP1800_LCM_EN, 1); gpio_output(GPIO_PP1800_LCM_EN, 1);
gpio_output(GPIO_PP3300_LCM_EN, 1); gpio_output(GPIO_PP3300_LCM_EN, 1);
mdelay(6); mdelay(15);
gpio_output(GPIO_LCM_RST_1V8, 1); gpio_output(GPIO_LCM_RST_1V8, 1);
mdelay(6); mdelay(6);
} }