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ALSA: hda - Fix Skylake codec timeout

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When the controller is powered up but the HDMI codec is powered down
on Skylake, the power well is turned off. When the codec is then
powered up again, we need to poke the codec a little extra to make
sure it wakes up. Otherwise we'll get sad "no response from codec"
messages and broken audio.

This also changes azx_runtime_resume to actually call
snd_hdac_set_codec_wakeup for Skylake (before STATETS read).
(Otherwise it would only have been called for Haswell and Broadwell,
which both do not need it, so this probably was not the author's
intention.)

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Reviewed-by: Libin Yang <libin.yang@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
David Henningsson 2015-07-16 10:39:24 +02:00 committed by Takashi Iwai
parent 0420694ddd
commit 033ea349a7
2 changed files with 14 additions and 9 deletions
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5
sound/hda/hdac_i915.c
View File

@ -56,8 +56,11 @@ int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
enable ? "enable" : "disable");
if (enable) {
if (!bus->i915_power_refcount++)
if (!bus->i915_power_refcount++) {
acomp->ops->get_power(acomp->dev);
snd_hdac_set_codec_wakeup(bus, true);
snd_hdac_set_codec_wakeup(bus, false);
}
} else {
WARN_ON(!bus->i915_power_refcount);
if (!--bus->i915_power_refcount)

6
sound/pci/hda/hda_intel.c
View File

@ -979,15 +979,17 @@ static int azx_runtime_resume(struct device *dev)
if (!azx_has_pm_runtime(chip))
return 0;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL
&& hda->need_i915_power) {
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
bus = azx_bus(chip);
if (hda->need_i915_power) {
snd_hdac_display_power(bus, true);
haswell_set_bclk(hda);
} else {
/* toggle codec wakeup bit for STATESTS read */
snd_hdac_set_codec_wakeup(bus, true);
snd_hdac_set_codec_wakeup(bus, false);
}
}
/* Read STATESTS before controller reset */
status = azx_readw(chip, STATESTS);