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| author | Mengdong Lin <mengdong.lin@intel.com> | 2012-08-10 14:11:58 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-08-10 14:11:58 +0200 |
| commit | e037cb4a54e26b5f55f856e0e7445cfcfb2f3d31 (patch) | |
| tree | 87ae699143576670557110a862711bf006fe2f46 /sound | |
| parent | 14bc9c6dc694e2d7930802f7afd275de25ef8394 (diff) | |
| download | linux-e037cb4a54e26b5f55f856e0e7445cfcfb2f3d31.tar.bz2 | |
ALSA : hda - bug fix on checking the supported power states of a codec
The return value of snd_hda_param_read() is -1 for an error, otherwise
it's the supported power states of a codec.
The supported power states is a 32-bit value. Bit 31 will be set to 1
if the codec supports EPSS, thus making "sup" negative. And the bit
28:5 is reserved as "0".
So a negative value other than -1 shall be further checked.
Please refer to High-Definition spec 7.3.4.12 "Supported Power
States", thanks!
Signed-off-by: Mengdong Lin <mengdong.lin@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_codec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 88a9c20eb7a2..629131ad7b8b 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -3497,7 +3497,7 @@ static bool snd_hda_codec_get_supported_ps(struct hda_codec *codec, hda_nid_t fg { int sup = snd_hda_param_read(codec, fg, AC_PAR_POWER_STATE); - if (sup < 0) + if (sup == -1) return false; if (sup & power_state) return true; |