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sunxi: video: Add support for LCD reset pin 

On some boards there is a gpio to reset the LCD panel, add support for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This commit is contained in:
Hans de Goede 2015-02-16 17:26:41 +01:00
parent 1320112c8a
commit 242e3d893d
2 changed files with 18 additions and 1 deletions
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8
board/sunxi/Kconfig
View File

@ -312,6 +312,14 @@ config VIDEO_LCD_POWER
Set the power enable pin for the LCD panel. This takes a string in the Set the power enable pin for the LCD panel. This takes a string in the
format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H. format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H.
config VIDEO_LCD_RESET
string "LCD panel reset pin"
depends on VIDEO
default ""
---help---
Set the reset pin for the LCD panel. This takes a string in the format
understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H.
config VIDEO_LCD_BL_EN config VIDEO_LCD_BL_EN
string "LCD panel backlight enable pin" string "LCD panel backlight enable pin"
depends on VIDEO depends on VIDEO

11
drivers/video/sunxi_display.c
View File

@ -592,7 +592,7 @@ static void sunxi_lcdc_enable(void)
static void sunxi_lcdc_panel_enable(void) static void sunxi_lcdc_panel_enable(void)
{ {
int pin; int pin, reset_pin;
/* /*
* Start with backlight disabled to avoid the screen flashing to * Start with backlight disabled to avoid the screen flashing to
@ -610,6 +610,12 @@ static void sunxi_lcdc_panel_enable(void)
gpio_direction_output(pin, PWM_OFF); gpio_direction_output(pin, PWM_OFF);
} }
reset_pin = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_RESET);
if (reset_pin != -1) {
gpio_request(reset_pin, "lcd_reset");
gpio_direction_output(reset_pin, 0); /* Assert reset */
}
/* Give the backlight some time to turn off and power up the panel. */ /* Give the backlight some time to turn off and power up the panel. */
mdelay(40); mdelay(40);
pin = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_POWER); pin = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_POWER);
@ -617,6 +623,9 @@ static void sunxi_lcdc_panel_enable(void)
gpio_request(pin, "lcd_power"); gpio_request(pin, "lcd_power");
gpio_direction_output(pin, 1); gpio_direction_output(pin, 1);
} }
if (reset_pin != -1)
gpio_direction_output(reset_pin, 1); /* De-assert reset */
} }
static void sunxi_lcdc_backlight_enable(void) static void sunxi_lcdc_backlight_enable(void)