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From: Timur Tabi <timur@tabi.org>
To: Nicolin Chen <nicoleotsuka@gmail.com>, Caleb Crome <caleb@crome.org>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	Max Krummenacher <max.krummenacher@toradex.com>,
	Arnaud Mouiche <arnaud.mouiche@invoxia.com>,
	Mark Brown <broonie@kernel.org>,
	Sascha Hauer <kernel@pengutronix.de>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	Fabio Estevam <festevam@gmail.com>
Subject: Re: [PATCH v2] ASoC: fsl_ssi: Fix channel swap on playback start
Date: Mon, 3 Apr 2017 19:07:42 -0500	[thread overview]
Message-ID: <97218d8f-4ba9-6f57-5ec7-d495826b41c4@tabi.org> (raw)
In-Reply-To: <20170403235542.GA23047@Asurada-Nvidia>

Nicolin Chen wrote:
> So your test case involve both TX and RX. That's why this change
> would impact it. My understanding is: because you can not enable
> TX and RX in the same time from user space but only through two
> separate back-to-back system calls. So when the 2nd system call
> happens (RX for example), the RE bit, supposed to be enabled by
> this 2nd system call, has already been set by the 1st TX system
> call -- there's some random data in the RX FIFO already.

This makes sense to me.  I don't have the bandwidth to test it just yet, but I 
suspect that this patch will break PowerPC systems as well.

  reply	other threads:[~2017-04-04  0:07 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
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 [this message]
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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