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ALSA: hda - Fix subsystem ID read regression 

A regression was introduced in 7639a06c23c7d4cda3: if AC_PAR_SUBSYSTEM_ID
reads as zero, one should retry using AC_VERB_GET_SUBSYSTEM_ID.

This seems to hit many codecs (my own laptop included), and causes
quirks for some machines not to apply correctly.

Reported-by: TienFu Chen <tienfu.chen@canonical.com>
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2015-04-01 12:43:00 +02:00 committed by Takashi Iwai
parent 4738465c37
commit ffda568e8b
1 changed files with 1 additions and 1 deletions
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2
sound/hda/hdac_device.c
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@ -91,7 +91,7 @@ int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
/* reread ssid if not set by parameter */
if (codec->subsystem_id == -1)
if (codec->subsystem_id == -1 || codec->subsystem_id == 0)
snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
&codec->subsystem_id);