From: Gireesh Hiremath Gireesh.Hiremath@in.bosch.com
Enable backlight, set brightness value and dimming frequency
Signed-off-by: Gireesh Hiremath Gireesh.Hiremath@in.bosch.com --- board/bosch/guardian/board.c | 26 ++++++++++++++++++++++++++ include/configs/am335x_guardian.h | 1 + 2 files changed, 27 insertions(+)
diff --git a/board/bosch/guardian/board.c b/board/bosch/guardian/board.c index 8704806047..6e6221ca60 100644 --- a/board/bosch/guardian/board.c +++ b/board/bosch/guardian/board.c @@ -224,12 +224,38 @@ err: env_set("swi_status", "err"); }
+void lcdbacklight_en(void) +{ + unsigned long brightness = env_get_ulong("backlight_brightness", 10, 50); + + if (brightness > 99 || brightness == 0) + brightness = 99; + + /* + * Brightness range: + * WLEDCTRL2 DUTY[6:0] + * + * 000 0000b = 1% + * 000 0001b = 2% + * ... + * 110 0010b = 99% + * 110 0011b = 100% + * + */ + + tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, TPS65217_WLEDCTRL2, + brightness, 0xFF); + tps65217_reg_write(TPS65217_PROT_LEVEL_NONE, TPS65217_WLEDCTRL1, + brightness != 0 ? 0x0A : 0x02, 0xFF); +} + int board_late_init(void) { #ifdef CONFIG_LED_GPIO led_default_state(); #endif set_bootmode_env(); + lcdbacklight_en(); return 0; } #endif /* CONFIG_BOARD_LATE_INIT */ diff --git a/include/configs/am335x_guardian.h b/include/configs/am335x_guardian.h index b966df08c6..08a9ac950c 100644 --- a/include/configs/am335x_guardian.h +++ b/include/configs/am335x_guardian.h @@ -63,6 +63,7 @@ BOOTENV \ GUARDIAN_DEFAULT_PROD_ENV \ "autoload=no\0" \ + "backlight_brightness=50\0" \ "bootubivol=rootfs\0" \ "distro_bootcmd=" \ "setenv rootflags "bulk_read,chk_data_crc"; " \