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Subject[PATCH 4.7 009/143] ALSA: hda - Manage power well properly for resume
Date
4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@suse.de>

commit a52ff34e5ec61749c62c6618b76a9d6dbecee450 upstream.

For SKL and later Intel chips, we control the power well per codec
basis via link_power callback since the commit [03b135cebc47: ALSA:
hda - remove dependency on i915 power well for SKL].
However, there are a few exceptional cases where the gfx registers are
accessed from the audio driver: namely the wakeup override bit
toggling at (both system and runtime) resume. This seems causing a
kernel warning when accessed during the power well down (and likely
resulting in the bogus register accesses).

This patch puts the proper power up / down sequence around the resume
code so that the wakeup bit is fiddled properly while the power is
up. (The other callback, sync_audio_rate, is used only in the PCM
callback, so it's guaranteed in the power-on.)

Also, by this proper power up/down, the instantaneous flip of wakeup
bit in the resume callback that was introduced by the commit
[033ea349a7cd: ALSA: hda - Fix Skylake codec timeout] becomes
superfluous, as snd_hdac_display_power() already does it. So we can
clean it up together.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96214
Fixes: 03b135cebc47 ('ALSA: hda - remove dependency on i915 power well for SKL')
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/pci/hda/hda_intel.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)

--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -906,20 +906,23 @@ static int azx_resume(struct device *dev
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip;
struct hda_intel *hda;
+ struct hdac_bus *bus;

if (!card)
return 0;

chip = card->private_data;
hda = container_of(chip, struct hda_intel, chip);
+ bus = azx_bus(chip);
if (chip->disabled || hda->init_failed || !chip->running)
return 0;

- if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL
- && hda->need_i915_power) {
- snd_hdac_display_power(azx_bus(chip), true);
- snd_hdac_i915_set_bclk(azx_bus(chip));
+ if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
+ snd_hdac_display_power(bus, true);
+ if (hda->need_i915_power)
+ snd_hdac_i915_set_bclk(bus);
}
+
if (chip->msi)
if (pci_enable_msi(pci) < 0)
chip->msi = 0;
@@ -929,6 +932,11 @@ static int azx_resume(struct device *dev

hda_intel_init_chip(chip, true);

+ /* power down again for link-controlled chips */
+ if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
+ !hda->need_i915_power)
+ snd_hdac_display_power(bus, false);
+
snd_power_change_state(card, SNDRV_CTL_POWER_D0);

trace_azx_resume(chip);
@@ -1008,6 +1016,7 @@ static int azx_runtime_resume(struct dev

chip = card->private_data;
hda = container_of(chip, struct hda_intel, chip);
+ bus = azx_bus(chip);
if (chip->disabled || hda->init_failed)
return 0;

@@ -1015,15 +1024,9 @@ static int azx_runtime_resume(struct dev
return 0;

if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
- bus = azx_bus(chip);
- if (hda->need_i915_power) {
- snd_hdac_display_power(bus, true);
+ snd_hdac_display_power(bus, true);
+ if (hda->need_i915_power)
snd_hdac_i915_set_bclk(bus);
- } 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 */
@@ -1043,6 +1046,11 @@ static int azx_runtime_resume(struct dev
azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
~STATESTS_INT_MASK);

+ /* power down again for link-controlled chips */
+ if ((chip->driver_caps & AZX_DCAPS_I915_POWERWELL) &&
+ !hda->need_i915_power)
+ snd_hdac_display_power(bus, false);
+
trace_azx_runtime_resume(chip);
return 0;
}

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