soundwire: intel: skip suspend/resume/wake when link was not started

On some HDaudio platforms, SoundWire devices are described in the
DSDT but never used. This patch adds a boolean status flag to skip all
suspend/resume/wake sequences for this configuration.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Author: plbossart

drivers/soundwire/intel.c

@@ -1456,6 +1456,7 @@ int intel_link_startup(struct auxiliary_device *auxdev)
 	if (!(link_flags & SDW_INTEL_MASTER_DISABLE_PM_RUNTIME_IDLE))
 		pm_runtime_idle(dev);
 
+	sdw->startup_done = true;
 	return 0;
 
 err_interrupt:
@@ -1495,8 +1496,9 @@ int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
 	sdw = dev_get_drvdata(dev);
 	bus = &sdw->cdns.bus;
 
-	if (bus->prop.hw_disabled) {
-		dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n", bus->link_id);
+	if (bus->prop.hw_disabled || !sdw->startup_done) {
+		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
+			bus->link_id);
 		return 0;
 	}
 
@@ -1533,8 +1535,8 @@ static int __maybe_unused intel_suspend(struct device *dev)
 	u32 clock_stop_quirks;
 	int ret;
 
-	if (bus->prop.hw_disabled) {
-		dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
+	if (bus->prop.hw_disabled || !sdw->startup_done) {
+		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 			bus->link_id);
 		return 0;
 	}
@@ -1587,8 +1589,8 @@ static int __maybe_unused intel_suspend_runtime(struct device *dev)
 	u32 clock_stop_quirks;
 	int ret;
 
-	if (bus->prop.hw_disabled) {
-		dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
+	if (bus->prop.hw_disabled || !sdw->startup_done) {
+		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 			bus->link_id);
 		return 0;
 	}
@@ -1652,8 +1654,8 @@ static int __maybe_unused intel_resume(struct device *dev)
 	bool multi_link;
 	int ret;
 
-	if (bus->prop.hw_disabled) {
-		dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
+	if (bus->prop.hw_disabled || !sdw->startup_done) {
+		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 			bus->link_id);
 		return 0;
 	}
@@ -1750,8 +1752,8 @@ static int __maybe_unused intel_resume_runtime(struct device *dev)
 	int status;
 	int ret;
 
-	if (bus->prop.hw_disabled) {
-		dev_dbg(dev, "SoundWire master %d is disabled, ignoring\n",
+	if (bus->prop.hw_disabled || !sdw->startup_done) {
+		dev_dbg(dev, "SoundWire master %d is disabled or not-started, ignoring\n",
 			bus->link_id);
 		return 0;
 	}

drivers/soundwire/intel.h

@@ -41,6 +41,7 @@ struct sdw_intel {
 	struct sdw_cdns cdns;
 	int instance;
 	struct sdw_intel_link_res *link_res;
+	bool startup_done;
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
 #endif