[PATCH v3] backlight: ktd253: Stabilize backlight

[Linus Walleij]

On Fri, Jun 4, 2021 at 8:34 AM Linus Walleij <linus.walleij at linaro.org> wrote:

> Remove interrupt disablement during backlight setting. It is
> way to dangerous and makes platforms instable by having it
> miss vblank IRQs leading to the graphics derailing.
>
> The code is using ndelay() which is not available on
> platforms such as ARM and will result in 32 * udelay(1)
> which is substantial.
>
> Add some code to detect if an interrupt occurs during the
> tight loop and in that case just redo it from the top.
>
> Fixes: 5317f37e48b9 ("backlight: Add Kinetic KTD253 backlight driver")
> Cc: Stephan Gerhold <stephan at gerhold.net>
> Reported-by: newbyte at disroot.org
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

Hm it seems this patch did not make it into v5.14-rc1, could it be applied
as a fix for the -rc:s?

Shall I resend it with Daniel's ACK?

Yours,
Linus Walleij