linux-kernel - Re: [PATCH 0/2] pwm: mtk-disp: Fix backlight configuration at boot

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Message-ID: <28142704-d82d-d533-d2a8-b1061182f1f6@collabora.com>
Date:   Wed, 8 Mar 2023 15:55:59 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     thierry.reding@...il.com, u.kleine-koenig@...gutronix.de,
        matthias.bgg@...il.com, weiqing.kong@...iatek.com,
        jitao.shi@...iatek.com, linux-pwm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH 0/2] pwm: mtk-disp: Fix backlight configuration at boot

Il 08/03/23 15:50, Greg Kroah-Hartman ha scritto:
> On Wed, Mar 08, 2023 at 12:46:07PM +0100, AngeloGioacchino Del Regno wrote:
>> Il 23/02/23 15:16, AngeloGioacchino Del Regno ha scritto:
>>> Il 23/01/23 17:06, AngeloGioacchino Del Regno ha scritto:
>>>> Since the pwm-mtk-disp driver was fixed to get PWM_EN state from the
>>>> right register, an old two-wrongs-make-one-right issue emerged: as a
>>>> result, MT8192 Asurada Spherion got no backlight at boot unless a
>>>> suspend/resume cycle was performed.
>>>> Also, the backlight would sometimes not get updated with the requested
>>>> value, requiring the user to change it back and forth until it worked.
>>>>
>>>> This series fixes both of the aforementioned issues found on MT8192.
>>>>
>>>> AngeloGioacchino Del Regno (2):
>>>>     pwm: mtk-disp: Disable shadow registers before setting backlight
>>>>       values
>>>>     pwm: mtk-disp: Configure double buffering before reading in
>>>>       .get_state()
>>>>
>>>>    drivers/pwm/pwm-mtk-disp.c | 34 +++++++++++++++++++++++-----------
>>>>    1 file changed, 23 insertions(+), 11 deletions(-)
>>>>
>>>
>>> Gentle ping for this one: this is fixing backlight issues on multiple MediaTek
>>> SoCs and was well tested.
>>>
>>> Thanks,
>>> Angelo
>>
>> Since this series was sent more than one month ago, and since this fixes broken
>> backlight on a number of Chromebooks with MT8183 and MT8192 SoCs, and seen the
>> urgency of getting these fixes in, I'm adding Greg to the loop.
> 
> $ ./scripts/get_maintainer.pl drivers/pwm/pwm-mtk-disp.c
> Thierry Reding <thierry.reding@...il.com> (maintainer:PWM SUBSYSTEM)
> "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de> (reviewer:PWM SUBSYSTEM)
> Matthias Brugger <matthias.bgg@...il.com> (maintainer:ARM/Mediatek SoC support)
> AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> (reviewer:ARM/Mediatek SoC support)
> linux-pwm@...r.kernel.org (open list:PWM SUBSYSTEM)
> linux-kernel@...r.kernel.org (open list:ARM/Mediatek SoC support)
> linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC support)
> linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC support)
> 
> I don't see my name in there, did I become the PWM maintainer somehow?
> 
> What's wrong with Thierry taking this like normal?
> 

Nothing wrong with that. I felt like this series got ignored as I've never
received any reply from Thierry, even though it's a Fixes series that I deem
to be moderately urgent; that's why I added you to the loop.

If that created unnecessary noise, I'm extremely sorry and won't happen again.

Regards,
Angelo