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board: imx53: Always disable display before starting kernel

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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>
This commit is contained in:
Lukasz Majewski 2018-05-20 08:33:14 +02:00 committed by Stefano Babic
parent faab193ea2
commit 642c1f519a
2 changed files with 10 additions and 0 deletions
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2
arch/arm/dts/imx53-kp.dts
View File

@ -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
>;
};

8
board/k+p/kp_imx53/kp_imx53.c
View File

@ -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())