From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Ying Liu <victor.liu@nxp.com>
Cc: "dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"lee@kernel.org" <lee@kernel.org>,
"daniel.thompson@linaro.org" <daniel.thompson@linaro.org>,
"jingoohan1@gmail.com" <jingoohan1@gmail.com>,
"deller@gmx.de" <deller@gmx.de>,
"andy@kernel.org" <andy@kernel.org>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
"brgl@bgdev.pl" <brgl@bgdev.pl>
Subject: Re: [PATCH v3] backlight: gpio_backlight: Drop output gpio direction check for initial power state
Date: Fri, 21 Jul 2023 12:10:42 +0300 [thread overview]
Message-ID: <CAHp75Vd3e66G1jWnrXX7jgcP3bQ5m91Z=Sd=e8hHF4nr39wJXQ@mail.gmail.com> (raw)
In-Reply-To: <20230721090332.1528569-1-victor.liu@nxp.com>
On Fri, Jul 21, 2023 at 11:58 AM Ying Liu <victor.liu@nxp.com> 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
prev parent reply other threads:[~2023-07-21 9:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-21 8:58 [PATCH v3] backlight: gpio_backlight: Drop output gpio direction check for initial power state Ying Liu
2023-07-21 9:10 ` Andy Shevchenko [this message]
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