linux-kernel - Re: [alsa-devel] [PATCH v3] ASoC: sgtl5000: add avc support

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Message-ID: <3b154ab9-6bbd-eb53-05e6-6d08cf3cc5c0@g0hl1n.net>
Date:   Thu, 20 Jul 2017 19:25:09 +0200
From:   Richard Leitner <dev@...l1n.net>
To:     Fabio Estevam <festevam@...il.com>,
        Richard Leitner <richard.leitner@...data.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Clemens Gruber <clemens.gruber@...ruber.com>,
        kalle.kankare@...cit.fi, Eric Nelson <eric@...int.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>, dev@...l1n.net
Subject: Re: [alsa-devel] [PATCH v3] ASoC: sgtl5000: add avc support

Hi Fabio,
thanks for the testing/reporting!

On 07/20/2017 07:11 PM, Fabio Estevam wrote:
>
> Running linux-next-20170720 on a imx53-qsb I get the following issue:
>
> root@...53qsb:~# reboot
...
> ALSA: Storing mixer settings...
> [   20.031604] Unable to handle kernel paging request at virtual
> address fffffffe
...
> [   20.242852] Backtrace:
> [   20.245318] [<c0759ae0>] (snd_soc_component_read) from [<c0759bc8>]
> (snd_soc_read+0x1c/0x30)
> [   20.253774] [<c0759bac>] (snd_soc_read) from [<c075e19c>]
> (avc_get_threshold+0x1c/0x90)
> [   20.261798] [<c075e180>] (avc_get_threshold) from [<c07349fc>]
> (snd_ctl_ioctl+0x5b8/0xb38)
...
> If I revert a729526720059ae ("ASoC: sgtl5000: add avc support") the
> problem does not happen.
>
> Could you please fix this issue?

Does this occur only on reboot or everytime the driver tries to read the 
AVC threshold (avc_get_threshold)?
Are you able to set the AVC threshold (using amixer)?

Thanks & regards,
Richard.L