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authorMengdong Lin <mengdong.lin@intel.com>2012-08-10 14:11:58 +0200
committerTakashi Iwai <tiwai@suse.de>2012-08-10 14:11:58 +0200
commite037cb4a54e26b5f55f856e0e7445cfcfb2f3d31 (patch)
tree87ae699143576670557110a862711bf006fe2f46 /sound
parent14bc9c6dc694e2d7930802f7afd275de25ef8394 (diff)
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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 88a9c20eb7a..629131ad7b8 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;