linux-kernel - Re: [PATCH] backlight: pwm_bl: Fix condition to set enable gpio as output

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Message-ID: <e5a9e6ce-b1dd-96ae-c051-60be7cbfbe1d@linaro.org>
Date:   Thu, 20 Apr 2017 10:55:34 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Paul Kocialkowski <contact@...lk.fr>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linux PWM List <linux-pwm@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH] backlight: pwm_bl: Fix condition to set enable gpio as
 output

On 18/04/17 09:46, Paul Kocialkowski wrote:
> Hi,
>
> Le lundi 17 avril 2017 à 21:36 +0200, Geert Uytterhoeven a écrit :
>> On Mon, Apr 17, 2017 at 5:38 PM, Paul Kocialkowski <contact@...lk.fr> wrote:
>>> Le dimanche 16 avril 2017 à 22:55 +0200, Geert Uytterhoeven a écrit :
>>>> On Sun, Apr 16, 2017 at 12:35 PM, Paul Kocialkowski <contact@...lk.fr>
>>>> wrote:
>>>>> The move to a dedicated pwm_backlight_initial_power_state function in
>>>>> commit 7613c922315e308a6486d802abed2eb74443dffd modified the condition
>>>>> to set the enable gpio as output. This breaks specific use cases using
>>>>> that GPIO, such as tegra124-based nyan Chromebooks where backlight
>>>>> stopped working.
>>>>>
>>>>> This puts the condition back to the way it was before the move.
>>>>>
>>>>> Signed-off-by: Paul Kocialkowski <contact@...lk.fr>
>>>>
>>>> Does "[PATCH v2] backlight: pwm_bl: Fix GPIO out for unimplemented
>>>> .get_direction()"
>>>> (https://lkml.org/lkml/2017/4/4/225) fix your issue?
>>>
>>> This definitely solves the issue!
>>>
>>> Since this fixes broken backlight (that, in turn, makes systems unusable),
>>> perhaps this should be included in the next rc cycle?
>>
>> You mean v4.11 final, as there probably won't be another rc?
>> Yes!
>
> I'm all for it!

Thanks for keeping our attention on this. I sent a PR yesterday (and 
hope my GPG key has attracted enough signatures).


Daniel.