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

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Date:   Wed, 8 Mar 2023 12:46:07 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     thierry.reding@...il.com
Cc:     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,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/2] pwm: mtk-disp: Fix backlight configuration at boot

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.

Regards,
Angelo