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

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Message-Id: <20230403133054.319070-1-angelogioacchino.delregno@collabora.com>
Date:   Mon,  3 Apr 2023 15:30:52 +0200
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, wenst@...omium.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH RESEND 0/2] pwm: mtk-disp: Fix backlight configuration at boot

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
and similar issues on MT8183 Chromebooks.

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(-)

-- 
2.39.0