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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 /fs | |
| parent | 14bc9c6dc694e2d7930802f7afd275de25ef8394 (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 'fs')
0 files changed, 0 insertions, 0 deletions