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ALSA: hda - WAKEEN feature enabling for runtime pm

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With runtime power save feature enabled, Headphone hotplug
event will not be detected while controller/codec in D3. HDA has
feature WAKEEN to let codec wake up system if controller is in D3 or
system in S3.(HDA Spec 4.5.9.2/3). Codec can send out INT or wake up
controller depending on whether CIE or GIE enabled.(Figure 4, Interupt
structure).

The controller must be in RESET mode after enter runtime-suspend, otherwise
it will not be waken up even if codec send out wake-up event. And STATESTS
will be cleared after controller brought out of RESET mode.

This patch only enable WAKEEN for runtime-suspend(Controller D3) mode,
not for system S3 mode. with tool "evtest", Headphone hotplug events
could be cought and reported successfully.

[fixed an unused variable warning by tiwai]

Signed-off-by: Wang Xingchao <xingchao.wang@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wang Xingchao 2013-07-25 23:34:46 -04:00 committed by Takashi Iwai
parent 18e6062756
commit 7d4f606c50
1 changed files with 24 additions and 0 deletions
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24
sound/pci/hda/hda_intel.c
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@ -2971,6 +2971,10 @@ static int azx_runtime_suspend(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
/* enable controller wake up event */
azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
STATESTS_INT_MASK);
azx_stop_chip(chip);
azx_enter_link_reset(chip);
azx_clear_irq_pending(chip);
@ -2983,11 +2987,31 @@ static int azx_runtime_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
struct hda_bus *bus;
struct hda_codec *codec;
int status;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL)
hda_display_power(true);
/* Read STATESTS before controller reset */
status = azx_readw(chip, STATESTS);
azx_init_pci(chip);
azx_init_chip(chip, 1);
bus = chip->bus;
if (status && bus) {
list_for_each_entry(codec, &bus->codec_list, list)
if (status & (1 << codec->addr))
queue_delayed_work(codec->bus->workq,
&codec->jackpoll_work, codec->jackpoll_interval);
}
/* disable controller Wake Up event*/
azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
~STATESTS_INT_MASK);
return 0;
}