ALSA: hda: cs35l41: Check runtime suspend capability at runtime_idle

The runtime PM core checks with runtime_idle callback whether it can
goes to the runtime suspend or not, and we can put the boost type
check there instead of runtime_suspend and _resume calls.  This will
reduce the unnecessary runtime_suspend() calls.

Fixes: 1873ebd3 ("ALSA: hda: cs35l41: Support Hibernation during Suspend")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230105093531.16960-2-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/cs35l41_hda.c

@@ -647,6 +647,15 @@ static int cs35l41_system_resume(struct device *dev)
 	return ret;
 }
 
+static int cs35l41_runtime_idle(struct device *dev)
+{
+	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
+
+	if (cs35l41->hw_cfg.bst_type == CS35L41_EXT_BOOST_NO_VSPK_SWITCH)
+		return -EBUSY; /* suspend not supported yet on this model */
+	return 0;
+}
+
 static int cs35l41_runtime_suspend(struct device *dev)
 {
 	struct cs35l41_hda *cs35l41 = dev_get_drvdata(dev);
@@ -1536,7 +1545,8 @@ void cs35l41_hda_remove(struct device *dev)
 EXPORT_SYMBOL_NS_GPL(cs35l41_hda_remove, SND_HDA_SCODEC_CS35L41);
 
 const struct dev_pm_ops cs35l41_hda_pm_ops = {
-	RUNTIME_PM_OPS(cs35l41_runtime_suspend, cs35l41_runtime_resume, NULL)
+	RUNTIME_PM_OPS(cs35l41_runtime_suspend, cs35l41_runtime_resume,
+		       cs35l41_runtime_idle)
 	SYSTEM_SLEEP_PM_OPS(cs35l41_system_suspend, cs35l41_system_resume)
 };
 EXPORT_SYMBOL_NS_GPL(cs35l41_hda_pm_ops, SND_HDA_SCODEC_CS35L41);