From 242e3d893d1311ea38abd25613076a29961d422e Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 16 Feb 2015 17:26:41 +0100
Subject: [PATCH] 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>
---
board/sunxi/Kconfig | 8 ++++++++
drivers/video/sunxi_display.c | 11 ++++++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 3eab81fd12..a170c561aa 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -312,6 +312,14 @@ config VIDEO_LCD_POWER
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.
+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
string "LCD panel backlight enable pin"
depends on VIDEO
diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index dbda97e746..7f01401252 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -592,7 +592,7 @@ static void sunxi_lcdc_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
@@ -610,6 +610,12 @@ static void sunxi_lcdc_panel_enable(void)
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. */
mdelay(40);
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_direction_output(pin, 1);
}
+
+ if (reset_pin != -1)
+ gpio_direction_output(reset_pin, 1); /* De-assert reset */
}
static void sunxi_lcdc_backlight_enable(void)
--
2.39.5