linux-kernel - [PATCH] ALSA: hda: Balance runtime/system PM if direct-complete is disabled

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Date:   Mon, 18 Jan 2021 21:09:36 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     tiwai@...e.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        "Kenneth R . Crudup" <kenny@...ix.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Harsha Priya <harshapriya.n@...el.com>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ALSA: hda: Balance runtime/system PM if direct-complete is disabled

HDA controller can't be runtime-suspended after commit 215a22ed31a1
("ALSA: hda: Refactor codjc PM to use direct-complete optimization"),
which enables direct-complete for HDA codec.

The HDA codec driver didn't expect direct-complete will be disabled
after it returns a positive value from prepare() callback. However,
there are some places that PM core can disable direct-complete. For
instance, system hibernation or when codec has subordinates like LEDs.

So if a device is prepared for direct-complete but PM core still calls
codec's suspend or freeze callback, resume the device to keep PM
operations balanced.

Reported-by: Kenneth R. Crudup <kenny@...ix.com>
Fixes: 215a22ed31a1 ("ALSA: hda: Refactor codec PM to use direct-complete optimization")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 sound/pci/hda/hda_codec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 687216e74526..0afbced979df 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2997,6 +2997,9 @@ static void hda_codec_pm_complete(struct device *dev)
 
 static int hda_codec_pm_suspend(struct device *dev)
 {
+	if (pm_runtime_status_suspended(dev))
+		pm_runtime_resume(dev);
+
 	dev->power.power_state = PMSG_SUSPEND;
 	return hda_codec_suspend(dev);
 }
@@ -3009,6 +3012,9 @@ static int hda_codec_pm_resume(struct device *dev)
 
 static int hda_codec_pm_freeze(struct device *dev)
 {
+	if (pm_runtime_status_suspended(dev))
+		pm_runtime_resume(dev);
+
 	dev->power.power_state = PMSG_FREEZE;
 	return hda_codec_suspend(dev);
 }
-- 
2.29.2