Patch "ASoC: atmel_ssc_dai: Don't unconditionally reset SSC on stream startup" has been added to the 4.4-stable tree

Patch "ASoC: atmel_ssc_dai: Don't unconditionally reset SSC on stream startup" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ASoC: atmel_ssc_dai: Don't unconditionally reset SSC on stream startup

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     asoc-atmel_ssc_dai-don-t-unconditionally-reset-ssc-on-stream-startup.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 3e103a65514c2947e53f3171b21255fbde8b60c6 Mon Sep 17 00:00:00 2001
From: Christoph Huber <c.huber@bct-electronic.com>
Date: Mon, 15 Aug 2016 18:59:25 +0200
Subject: ASoC: atmel_ssc_dai: Don't unconditionally reset SSC on stream startup

From: Christoph Huber <c.huber@bct-electronic.com>

commit 3e103a65514c2947e53f3171b21255fbde8b60c6 upstream.

commit cbaadf0f90d6 ("ASoC: atmel_ssc_dai: refactor the startup and
shutdown") refactored code such that the SSC is reset on every
startup; this breaks duplex audio (e.g. first start audio playback,
then start record, causing the playback to stop/hang)

Fixes: cbaadf0f90d6 (ASoC: atmel_ssc_dai: refactor the startup and shutdown)
Signed-off-by: Christoph Huber <c.huber@bct-electronic.com>
Signed-off-by: Peter Meerwald-Stadler <p.meerwald@bct-electronic.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 sound/soc/atmel/atmel_ssc_dai.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/sound/soc/atmel/atmel_ssc_dai.c
+++ b/sound/soc/atmel/atmel_ssc_dai.c
@@ -298,8 +298,9 @@ static int atmel_ssc_startup(struct snd_
 	clk_enable(ssc_p->ssc->clk);
 	ssc_p->mck_rate = clk_get_rate(ssc_p->ssc->clk);
 
-	/* Reset the SSC to keep it at a clean status */
-	ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
+	/* Reset the SSC unless initialized to keep it in a clean state */
+	if (!ssc_p->initialized)
+		ssc_writel(ssc_p->ssc->regs, CR, SSC_BIT(CR_SWRST));
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		dir = 0;


Patches currently in stable-queue which might be from c.huber@bct-electronic.com are

queue-4.4/asoc-atmel_ssc_dai-don-t-unconditionally-reset-ssc-on-stream-startup.patch