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From: Fabio Estevam <festevam@gmail.com>
To: Caleb Crome <caleb@crome.org>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	Arnaud Mouiche <arnaud.mouiche@invoxia.com>,
	Timur Tabi <timur@tabi.org>,
	Nicolin Chen <nicoleotsuka@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Max Krummenacher <max.krummenacher@toradex.com>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH v2] ASoC: fsl_ssi: Fix channel swap on playback start
Date: Mon, 3 Apr 2017 18:53:07 -0300	[thread overview]
Message-ID: <CAOMZO5BiRrRurJUsLb_pgSEw+ByZSSg6b3sRz17tKUXT1wRaSw@mail.gmail.com> (raw)
In-Reply-To: <CAG5mAdyg9jbNcGi6kNLf5s1wk7HkchM5-MjVVJNuATU07HtrUQ@mail.gmail.com>

Hi Caleb,

On Mon, Apr 3, 2017 at 5:32 PM, Caleb Crome <caleb@crome.org> wrote:

> This patch definitely breaks the i.mx6 channel alignment.  In fact it
> breaks it so that the channels are never aligned properly.
>
> My test setup is as follows:
> * Get vanilla kernel, tag v4.11-rc5

Thanks for testing.

Just tested 4.11-rc5. It needs this additional patch:
https://patchwork.ozlabs.org/patch/745349/

otherwise pinctrl hog is broken and then sgtl5000 does not probe due
to the lack of MCLK.

I am using the original imx6dl-wandboard.dtb on my tests with no
hardware changes.

The test I am running is simple: just run the following script on the wandboard:

#!/bin/bash

while true
do
aplay swap_test.wav& sleep 1; killall aplay
done

You can get swap_test.wav file that consists of silence in the left
channel and none silence in the right channel from here:
https://www.dropbox.com/s/4zt0jvmtx34ic9x/swap_test.wav?dl=0

Then keep listening the left channel. In about one out of ten times
you will get non-silence there, indicating a swap.

> * apply a couple patches to allow AUD4 on the wandboard external
> connectors (and disable internal audio)
> * Test results:  v4.11-rc5 works flawlessly using Arnaud's atest
> program.  No channel slips, no issues at all.
> * Apply this patch, recompile, build.
> * Channel alignment fails.  The channels never get aligned properly.
>
> Am I right that the *only* change is this one-liner, and ignore the
> previous non V2 version of this patch?
>> -               regmap_update_bits(regs, CCSR_SSI_SCR, vals->scr, vals->scr);
>> +               regmap_update_bits(regs, CCSR_SSI_SCR,
>> +                       CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE,
>> +                       CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE);

Yes, with only this change I do not get the swap anymore.

If you have a chance to run this method, please let me know how it goes.

Thanks

  parent reply	other threads:[~2017-04-03 21:53 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-01 14:48 Fabio Estevam
2017-04-01 15:13 ` Arnaud Mouiche
2017-04-01 16:03   ` Fabio Estevam
2017-04-03  8:19 ` Max Krummenacher
2017-04-03 20:32 ` Caleb Crome
2017-04-03 20:50   ` Caleb Crome
2017-04-03 21:53   ` Fabio Estevam [this message]
2017-04-03 22:05     ` Arnaud Mouiche
2017-04-03 22:20       ` Nicolin Chen
2017-04-03 23:22     ` Caleb Crome
2017-04-03 23:40       ` Fabio Estevam
2017-04-03 23:42         ` Caleb Crome
2017-04-04  8:59           ` Arnaud Mouiche
2017-04-04  9:03             ` Arnaud Mouiche
2017-04-04 11:38             ` Fabio Estevam
2017-04-04 17:12               ` Fabio Estevam
2017-04-04 20:09                 ` Arnaud Mouiche
2017-04-04 20:28                   ` Fabio Estevam
2017-04-05  7:54                     ` Arnaud Mouiche
2017-04-05 13:43                       ` Fabio Estevam
2017-04-05 14:04                       ` Max Krummenacher
2017-04-03 22:08   ` Nicolin Chen
2017-04-03 23:31     ` Caleb Crome
2017-04-03 23:55       ` Nicolin Chen
2017-04-04  0:07         ` Timur Tabi
2017-04-04  0:39         ` Caleb Crome
2017-04-04  1:25           ` Nicolin Chen
2017-04-03 22:36 ` Nicolin Chen
2017-04-03 22:54   ` Fabio Estevam
2017-04-04  0:08     ` Nicolin Chen

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