linux-kernel - atmel_ssc_dai, duplex audio support?

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Message-ID: <alpine.DEB.2.02.1608031701110.12443@pmeerw.net>
Date:	Wed, 3 Aug 2016 17:11:49 +0200 (CEST)
From:	Peter Meerwald-Stadler <pmeerw@...erw.net>
To:	Bo Shen <voice.shen@...el.com>
cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org,
	Christoph Huber <c.huber@...-electronic.com>
Subject: atmel_ssc_dai, duplex audio support?

Hello,

it appears that atmel_ssc_dai does not support duplex audio, i.e. when
first starting a playback stream and then starting a record stream, the 
playback stops

problem seems to be in atmel_ssc_startup():

/* Reset the SSC to keep it at a clean status */
ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));

which is performed unconditionally when a stream starts

code was introduced with 
ASoC: atmel_ssc_dai: refactor the startup and shutdown, commit cbaadf0f90d6

tested with the 4.1 branch of linux-at91 git

thanks, regards, p.

-- 

Peter Meerwald-Stadler
+43-664-2444418 (mobile)