linux-kernel - alc262 streams synchronization

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Date:	Fri, 7 Dec 2012 17:01:22 +0100
From:	Jonathan.Klee@...iacaerospace.com
To:	linux-kernel@...r.kernel.org
Cc:	tiwai@...e.se, david.henningsson@...onical.com
Subject: alc262 streams synchronization

Hello,

I have faced the following issue with alc262 codec on kernel 3.2.34 :

Trying to play a file through vlc (libvlc/emotion), I did not have any sound on the speakers. Having a look at my kernel logs, I have noticed 2 calls to snd_hda_codec_setup_stream() separated by a call to __snd_hda_codec_cleanup_stream().

Nevertheless, adding some debug prints, I have noticed only one call to snd_hda_codec_write() in snd_hda_codec_setup_stream() to set the stream id. It seems like the stream id of the codec was not synchronized with the flag p->active the kernel maintains for the codec.

Setting the no_sticky_stream field in patch_alc262.c solved the issue. What about setting that field ? Am I the only one who faced that issue ?

--- a/sound/pci/hda/patch_realtek.c     2012-12-04 12:46:22.000000000 +0100
+++ b/sound/pci/hda/patch_realtek.c     2012-12-04 13:52:37.000000000 +0100
@@ -4490,6 +4490,8 @@
        if (spec == NULL)
                return -ENOMEM;

+       codec->no_sticky_stream=1;
+       printk(KERN_INFO "hda_codec: no sticky stream set\n");
        codec->spec = spec;

--
Jonathan Klee 

Embedded Software Engineer
Zodiac IFE
Tel: +33 1 61 34 11 71
http://www.zodiacaerospace.com
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