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From: Fabio Estevam <festevam@gmail.com>
To: Arnaud Mouiche <arnaud.mouiche@invoxia.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	Sascha Hauer <kernel@pengutronix.de>, Timur Tabi <timur@tabi.org>,
	Caleb Crome <caleb@crome.org>,
	Nicolin Chen <nicoleotsuka@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Max Krummenacher <max.krummenacher@toradex.com>,
	Fabio Estevam <fabio.estevam@nxp.com>
Subject: Re: [PATCH v2] ASoC: fsl_ssi: Fix channel swap on playback start
Date: Tue, 4 Apr 2017 17:28:53 -0300	[thread overview]
Message-ID: <CAOMZO5CaqpELX0pPS0g7_bi0eEokhtxJtavphssnUi8iJ15XLQ@mail.gmail.com> (raw)
In-Reply-To: <9c489e80-2579-3739-1343-2b3587667680@invoxia.com>

On Tue, Apr 4, 2017 at 5:09 PM, Arnaud Mouiche
<arnaud.mouiche@invoxia.com> wrote:

> SCR bit 3 (NET) is also set, so you should be in network mode with a long
> frame sync.
> In fact, you can entirely simulate a I2S behavior using Network mode. you
> should just be careful about the way everything is configured (eg. place of
> samples in the stream)

While debugging this issue I noticed that when I put the oscilloscope
probe in the LRCLK SGTL5000 pin the swap did not occur anymore.

After removing the probe the swap occurred frequently.

So decided to change the SGTL5000 LRCLK pin strength value:

--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1118,7 +1118,7 @@ static int sgtl5000_probe(struct snd_soc_codec *codec)
                        SGTL5000_DAC_MUTE_RIGHT |
                        SGTL5000_DAC_MUTE_LEFT);

-       snd_soc_write(codec, SGTL5000_CHIP_PAD_STRENGTH, 0x015f);
+       snd_soc_write(codec, SGTL5000_CHIP_PAD_STRENGTH, 0x035f);

        snd_soc_write(codec, SGTL5000_CHIP_ANA_CTRL,
                        SGTL5000_HP_ZCD_EN |

and the swap does not happen.

So it seems that no change is needed on the imx-ssi side :-)

  reply	other threads:[~2017-04-04 20:28 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
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 [this message]
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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