On Fri, Jul 21, 2023 at 11:58 AM Ying Liu [off-list ref] wrote:

If gpio pin is in input state but backlight is currently off due to

GPIO

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:

---
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.
---

Just use ---8<--- or drop these completely, as your (commit message of
the) patch is broken now.

So, let's drop output gpio direction check and only check gpio value to set

GPIO
GPIO

the initial power state.

Fixes: 706dc68102bc ("backlight: gpio: Explicitly set the direction of the GPIO")
Signed-off-by: Liu Ying <victor.liu@nxp.com>

-- 
With Best Regards,
Andy Shevchenko