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

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Message-ID: <06918fde-64ea-37b2-da1a-1c8316457223@collabora.com>
Date:   Thu, 23 Feb 2023 15:16:01 +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
Subject: Re: [PATCH 0/2] pwm: mtk-disp: Fix backlight configuration at boot

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