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ALSA: hda - reduce msleep time if EPSS power states supported 

if EPSS supported, transition from D3 state to D0 state in less
than 10ms

Signed-off-by: Wang Xingchao <xingchao.wang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wang Xingchao 2012-06-07 16:51:33 +08:00 committed by Takashi Iwai
parent 0c7f46ad92
commit 0f4ccbb025
1 changed files with 5 additions and 2 deletions
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7
sound/pci/hda/hda_codec.c
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@ -3532,8 +3532,11 @@ static void hda_set_power_state(struct hda_codec *codec, hda_nid_t fg,
}
/* this delay seems necessary to avoid click noise at power-down */
if (power_state == AC_PWRST_D3)
msleep(100);
if (power_state == AC_PWRST_D3) {
/* transition time less than 10ms for power down */
bool epss = snd_hda_codec_get_supported_ps(codec, fg, AC_PWRST_EPSS);
msleep(epss ? 10 : 100);
}
snd_hda_codec_read(codec, fg, 0, AC_VERB_SET_POWER_STATE,
power_state);
snd_hda_codec_set_power_to_all(codec, fg, power_state, true);