This patch prevents from the situation where we may end up with garbage displayed on the LCD panel.
Such situation occurs when one performs "reboot -f" in Linux and then stop in U-boot (or observe the garbage on the screen during boot up).
To prevent from such situation - the PWM pin is configured as GPIO and set to LOW.
Signed-off-by: Lukasz Majewski lukma@denx.de
---
arch/arm/dts/imx53-kp.dts | 2 ++ board/k+p/kp_imx53/kp_imx53.c | 8 ++++++++ 2 files changed, 10 insertions(+)
diff --git a/arch/arm/dts/imx53-kp.dts b/arch/arm/dts/imx53-kp.dts index fd64a9f2f6..6322ef1323 100644 --- a/arch/arm/dts/imx53-kp.dts +++ b/arch/arm/dts/imx53-kp.dts @@ -86,6 +86,8 @@ MX53_PAD_PATA_DA_2__GPIO7_8 0x1e4 /* BOOSTER_OFF */ MX53_PAD_EIM_CS0__GPIO2_23 0x1e4 + /* LCD BACKLIGHT */ + MX53_PAD_GPIO_1__GPIO1_1 0x1e4 >; };
diff --git a/board/k+p/kp_imx53/kp_imx53.c b/board/k+p/kp_imx53/kp_imx53.c index c80eed36c6..6b0db6b8de 100644 --- a/board/k+p/kp_imx53/kp_imx53.c +++ b/board/k+p/kp_imx53/kp_imx53.c @@ -22,6 +22,7 @@ #define VBUS_PWR_EN IMX_GPIO_NR(7, 8) #define PHY_nRST IMX_GPIO_NR(7, 6) #define BOOSTER_OFF IMX_GPIO_NR(2, 23) +#define LCD_BACKLIGHT IMX_GPIO_NR(1, 1)
DECLARE_GLOBAL_DATA_PTR;
@@ -189,10 +190,17 @@ void eth_phy_reset(void) udelay(50); }
+void board_disable_display(void) +{ + gpio_request(LCD_BACKLIGHT, "LCD_BACKLIGHT"); + gpio_direction_output(LCD_BACKLIGHT, 0); +} + int board_late_init(void) { int ret = 0;
+ board_disable_display(); setup_ups();
if (!power_init())