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| author | Hans de Goede <hdegoede@redhat.com> | 2015-01-22 21:02:42 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2015-01-23 15:15:02 +0100 |
| commit | a7403ae84d15096330d6b08b11b1a4b03da38abf (patch) | |
| tree | 202151d1845601f2e482164f712cbeec98368ec0 | |
| parent | c17fb11c56629e3e293db81600d0bf7926f221ee (diff) | |
| download | u-boot-a7403ae84d15096330d6b08b11b1a4b03da38abf.tar.gz u-boot-a7403ae84d15096330d6b08b11b1a4b03da38abf.tar.bz2 u-boot-a7403ae84d15096330d6b08b11b1a4b03da38abf.zip | |
sunxi: video: Make pwm polarity configurable
It turns out that there are some panels where the pwm input is not active low,
so make it configurable.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
| -rw-r--r-- | board/sunxi/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/video/sunxi_display.c | 17 |
2 files changed, 18 insertions, 6 deletions
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index 0e3c2076dc..738b55e74a 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -319,6 +319,13 @@ config VIDEO_LCD_BL_PWM Set the backlight pwm 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_PWM_ACTIVE_LOW + bool "LCD panel backlight pwm is inverted" + depends on VIDEO + default y + ---help--- + Set this if the backlight pwm output is active low. + # Note only one of these may be selected at a time! But hidden choices are # not supported by Kconfig diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c index 5077111daf..af728b51c7 100644 --- a/drivers/video/sunxi_display.c +++ b/drivers/video/sunxi_display.c @@ -23,6 +23,14 @@ #include "hitachi_tx18d42vm_lcd.h" #include "ssd2828.h" +#ifdef CONFIG_VIDEO_LCD_BL_PWM_ACTIVE_LOW +#define PWM_ON 0 +#define PWM_OFF 1 +#else +#define PWM_ON 1 +#define PWM_OFF 0 +#endif + DECLARE_GLOBAL_DATA_PTR; enum sunxi_monitor { @@ -598,8 +606,7 @@ static void sunxi_lcdc_panel_enable(void) pin = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_BL_PWM); if (pin != -1) { gpio_request(pin, "lcd_backlight_pwm"); - /* backlight pwm is inverted, set to 1 to disable backlight */ - gpio_direction_output(pin, 1); + gpio_direction_output(pin, PWM_OFF); } /* Give the backlight some time to turn off and power up the panel. */ @@ -626,10 +633,8 @@ static void sunxi_lcdc_backlight_enable(void) gpio_direction_output(pin, 1); pin = sunxi_name_to_gpio(CONFIG_VIDEO_LCD_BL_PWM); - if (pin != -1) { - /* backlight pwm is inverted, set to 0 to enable backlight */ - gpio_direction_output(pin, 0); - } + if (pin != -1) + gpio_direction_output(pin, PWM_ON); } static int sunxi_lcdc_get_clk_delay(const struct ctfb_res_modes *mode) |