If GPIO pin is in input state but backlight is currently off due to
default pull downs, then initial power state is set to FB_BLANK_UNBLANK
in DT boot mode with phandle link and the backlight is effectively
turned on in gpio_backlight_probe(), which is undesirable according to
patch description of commit ec665b756e6f ("backlight: gpio-backlight:
Correct initial power state handling").
Quote:
---8<---
If in DT boot we have phandle link then leave the GPIO in a state which the
bootloader left it and let the user of the backlight to configure it further.
---8<---
So, let's drop output GPIO direction check and only check GPIO value to set
the initial power state.
Fixes: 706dc68102bc ("backlight: gpio: Explicitly set the direction of the GPIO")
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
---
v3->v4:
* Capitalize words 'gpio' in patch description. (Andy)
* Capitalize word 'gpio' in patch title.
* Quote appropriately in patch description. (Andy)
v2->v3:
* Add Fixes tag. (Daniel)
v1->v2:
* Improve patch description. (Daniel, Bartosz, Andy)
drivers/video/backlight/gpio_backlight.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 6f78d928f054..38c46936fdcd 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -87,8 +87,7 @@ static int gpio_backlight_probe(struct platform_device *pdev)
/* Not booted with device tree or no phandle link to the node */
bl->props.power = def_value ? FB_BLANK_UNBLANK
: FB_BLANK_POWERDOWN;
- else if (gpiod_get_direction(gbl->gpiod) == 0 &&
- gpiod_get_value_cansleep(gbl->gpiod) == 0)
+ else if (gpiod_get_value_cansleep(gbl->gpiod) == 0)
bl->props.power = FB_BLANK_POWERDOWN;
else
bl->props.power = FB_BLANK_UNBLANK;
--
2.37.1
