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[ALSA] cmipci: document 'Modem' control version check
author
Clemens Ladisch
<clemens@ladisch.de>
Tue, 11 Dec 2007 07:55:16 +0000
(08:55 +0100)
committer
Jaroslav Kysela
<perex@perex.cz>
Thu, 31 Jan 2008 16:29:31 +0000
(17:29 +0100)
Add a comment that explains why the 'Modem' control doesn't work with
newer chips.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
sound/pci/cmipci.c
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diff --git
a/sound/pci/cmipci.c
b/sound/pci/cmipci.c
index
8cb3436
..
bc0a195
100644
(file)
--- a/
sound/pci/cmipci.c
+++ b/
sound/pci/cmipci.c
@@
-2733,6
+2733,10
@@
static int __devinit snd_cmipci_mixer_new(struct cmipci *cm, int pcm_spdif_devic
}
/* card switches */
+ /*
+ * newer chips don't have the register bits to force modem link
+ * detection; the bit that was FLINKON now mutes CH1
+ */
if (cm->chip_version < 39) {
err = snd_ctl_add(cm->card,
snd_ctl_new1(&snd_cmipci_modem_switch, cm));