linux-kernel - Re: [PATCH] ASoC: sgtl5000: Reset the CHIP_CLK

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Date:   Thu, 10 Nov 2022 16:08:44 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Detlev Casanova <detlev.casanova@...labora.com>
Cc:     linux-kernel@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:NXP SGTL5000 DRIVER" <alsa-devel@...a-project.org>
Subject: Re: [PATCH] ASoC: sgtl5000: Reset the CHIP_CLK_CTRL reg on remove

On Thu, Nov 10, 2022 at 4:06 PM Detlev Casanova
<detlev.casanova@...labora.com> wrote:
>
> Since commit bf2aebccddef ("ASoC: sgtl5000: Fix noise on shutdown/remove"),
> the device power control registers are reset when the driver is
> removed/shutdown.
>
> This is an issue when the device is configured to use the PLL clock. The
> device will stop responding if it is still configured to use the PLL
> clock but the PLL clock is powered down.
>
> When rebooting linux, the probe function will show:
> sgtl5000 0-000a: Error reading chip id -11
>
> Make sure that the CHIP_CLK_CTRL is reset to its default value before
> powering down the device.
>
> Fixes: bf2aebccddef ("ASoC: sgtl5000: Fix noise on shutdown/remove")
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>

Reviewed-by: Fabio Estevam <festevam@...il.com>