[PATCH 1/2] ALSA: hda: Keep PM disablement for deny-listed instance

[Takashi Iwai <tiwai@xxxxxxx>]

We have a runtime PM deny-list for the devices that show the problems
(typically click noises) at runtime suspend/resume, and when it
matches, the driver disables the default runtime PM.  However, we
still allow the runtime PM changed via power_save module option
dynamically, and the desktop system often tweaks it.  This ended up
with a re-enablement of the runtime PM that surprises users, suddenly
suffering from the noises.

This patch changes the driver behavior slightly: when the device is
listed in the deny-list, ignore the power_save option change and keep
the original (that is, off) runtime PM state.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/pci/hda/hda_intel.c | 5 ++++-
 sound/pci/hda/hda_intel.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index ad474ca9b24e..951ea46824d5 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -933,7 +933,8 @@ static int __maybe_unused param_set_xint(const char *val, const struct kernel_pa
 	mutex_lock(&card_list_lock);
 	list_for_each_entry(hda, &card_list, list) {
 		chip = &hda->chip;
-		if (!hda->probe_continued || chip->disabled)
+		if (!hda->probe_continued || chip->disabled ||
+		    hda->runtime_pm_disabled)
 			continue;
 		snd_hda_set_power_save(&chip->bus, power_save * 1000);
 	}
@@ -2243,6 +2244,7 @@ static const struct snd_pci_quirk power_save_denylist[] = {
 
 static void set_default_power_save(struct azx *chip)
 {
+	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
 	int val = power_save;
 
 	if (pm_blacklist) {
@@ -2253,6 +2255,7 @@ static void set_default_power_save(struct azx *chip)
 			dev_info(chip->card->dev, "device %04x:%04x is on the power_save denylist, forcing power_save to 0\n",
 				 q->subvendor, q->subdevice);
 			val = 0;
+			hda->runtime_pm_disabled = 1;
 		}
 	}
 	snd_hda_set_power_save(&chip->bus, val * 1000);
diff --git a/sound/pci/hda/hda_intel.h b/sound/pci/hda/hda_intel.h
index 0f39418f9328..2d1725f86ef1 100644
--- a/sound/pci/hda/hda_intel.h
+++ b/sound/pci/hda/hda_intel.h
@@ -22,6 +22,7 @@ struct hda_intel {
 	/* extra flags */
 	unsigned int irq_pending_warned:1;
 	unsigned int probe_continued:1;
+	unsigned int runtime_pm_disabled:1;
 
 	/* vga_switcheroo setup */
 	unsigned int use_vga_switcheroo:1;
-- 
2.43.0