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board: ge: bx50v3: enable backlight on demand

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Enable display backlight only if a message needs to be displayed.
The kernel re-initializes the backlight, which results in some
unwanted artifacts.

Signed-off-by: Ian Ray <ian.ray@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Ian Ray 2018-04-04 10:50:17 +02:00 committed by Stefano Babic
parent 7a0ce1f797
commit 6c0e6b45f9
2 changed files with 29 additions and 17 deletions
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45
board/ge/bx50v3/bx50v3.c
View File

@ -786,23 +786,6 @@ int board_late_init(void)
add_board_boot_modes(board_boot_modes);
#endif
#ifdef CONFIG_VIDEO_IPUV3
/* We need at least 200ms between power on and backlight on
* as per specifications from CHI MEI */
mdelay(250);
/* enable backlight PWM 1 */
pwm_init(0, 0, 0);
/* duty cycle 5000000ns, period: 5000000ns */
pwm_config(0, 5000000, 5000000);
/* Backlight Power */
gpio_direction_output(LVDS_BACKLIGHT_GP, 1);
pwm_enable(0);
#endif
/* board specific pmic init */
pmic_init();
@ -843,3 +826,31 @@ int checkboard(void)
printf("BOARD: %s\n", CONFIG_BOARD_NAME);
return 0;
}
static int do_backlight_enable(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
#ifdef CONFIG_VIDEO_IPUV3
/* We need at least 200ms between power on and backlight on
* as per specifications from CHI MEI */
mdelay(250);
/* enable backlight PWM 1 */
pwm_init(0, 0, 0);
/* duty cycle 5000000ns, period: 5000000ns */
pwm_config(0, 5000000, 5000000);
/* Backlight Power */
gpio_direction_output(LVDS_BACKLIGHT_GP, 1);
pwm_enable(0);
#endif
return 0;
}
U_BOOT_CMD(
bx50_backlight_enable, 1, 1, do_backlight_enable,
"enable Bx50 backlight",
""
);

1
include/configs/ge_bx50v3.h
View File

@ -128,6 +128,7 @@
"swappartitions=" \
"setexpr partnum 3 - ${partnum}\0" \
"failbootcmd=" \
"bx50_backlight_enable; " \
"msg=\"Monitor failed to start. Try again, or contact GE Service for support.\"; " \
"echo $msg; " \
"setenv stdout vga; " \