On 9/21/21 3:33 PM, Lee Jones wrote:
On Sat, 11 Sep 2021, Marek Vasut wrote:
On 7/13/21 9:16 PM, Marek Vasut wrote:
The note in c2adda27d202f ("video: backlight: Add of_find_backlight helper
in backlight.c") says that gpio-backlight uses brightness as power state.
This has been fixed since in ec665b756e6f7 ("backlight: gpio-backlight:
Correct initial power state handling") and other backlight drivers do not
require this workaround. Drop the workaround.
This fixes the case where e.g. pwm-backlight can perfectly well be set to
brightness 0 on boot in DT, which without this patch leads to the display
brightness to be max instead of off.
Fixes: c2adda27d202f ("video: backlight: Add of_find_backlight helper in backlight.c")
Acked-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
Reviewed-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 5.4+
Cc: <stable@xxxxxxxxxxxxxxx> # 4.19.x: ec665b756e6f7: backlight: gpio-backlight: Correct initial power state handling
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Cc: Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx>
Cc: Noralf Trønnes <noralf@xxxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
---
V2: Add AB/RB, CC stable
---
drivers/video/backlight/backlight.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 537fe1b376ad7..fc990e576340b 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -688,12 +688,6 @@ static struct backlight_device *of_find_backlight(struct device *dev)
of_node_put(np);
if (!bd)
return ERR_PTR(-EPROBE_DEFER);
- /*
- * Note: gpio_backlight uses brightness as
- * power state during probe
- */
- if (!bd->props.brightness)
- bd->props.brightness = bd->props.max_brightness;
}
}
Any news on this ?
Expanding CC list.
Looks like I was left off of the original submission.
I can't apply a quoted patch. Please re-submit.
I see. It seems the patch is available in both Lore and Patchwork:
https://lore.kernel.org/all/072e01b7-8554-de4f-046a-da11af3958d6@xxxxxxx/T/
https://patchwork.freedesktop.org/patch/443823/
