From: Jussi Laako <jussi@sonarnerd.net>
Date: Mon, 28 Nov 2016 09:27:45 +0000 (+0200)
Subject: ALSA: hiface: Fix M2Tech hiFace driver sampling rate change
X-Git-Tag: v3.12.70~213
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72588bd4bae84380f6ae9a4c828d84d8c22f19ec;p=thirdparty%2Fkernel%2Fstable.git

ALSA: hiface: Fix M2Tech hiFace driver sampling rate change

commit 995c6a7fd9b9212abdf01160f6ce3193176be503 upstream.

Sampling rate changes after first set one are not reflected to the
hardware, while driver and ALSA think the rate has been changed.

Fix the problem by properly stopping the interface at the beginning of
prepare call, allowing new rate to be set to the hardware. This keeps
the hardware in sync with the driver.

Signed-off-by: Jussi Laako <jussi@sonarnerd.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---

diff --git a/sound/usb/hiface/pcm.c b/sound/usb/hiface/pcm.c
index c21a3df9a0df1..d4d036fca6cba 100644
--- a/sound/usb/hiface/pcm.c
+++ b/sound/usb/hiface/pcm.c
@@ -445,6 +445,8 @@ static int hiface_pcm_prepare(struct snd_pcm_substream *alsa_sub)
 
 	mutex_lock(&rt->stream_mutex);
 
+	hiface_pcm_stream_stop(rt);
+
 	sub->dma_off = 0;
 	sub->period_off = 0;