Revert "coresight: cti: Fix hang in cti_disable_hw()"

This reverts commit 665c157.

It causes reported build warnings:

drivers/hwtracing/coresight/coresight-cti-core.c: In functio
n 'cti_enable_hw':
drivers/hwtracing/coresight/coresight-cti-core.c:93:24: warning: unused variable 'dev' [-Wunused-variable]
   93 |         struct device *dev = &drvdata->csdev->dev;
      |                        ^~~
drivers/hwtracing/coresight/coresight-cti-core.c: In function 'cti_disable_hw':
drivers/hwtracing/coresight/coresight-cti-core.c:154:24: warning: unused variable 'dev' [-Wunused-variable]
  154 |         struct device *dev = &drvdata->csdev->dev;
      |                        ^~~

Reported-by: Stephen Rothwell <[email protected]>
Cc: Aishwarya TCV <[email protected]>
Cc: Cristian Marussi <[email protected]>
Cc: Suzuki Poulose <[email protected]>
Cc: James Clark <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Fixes: 665c157 ("coresight: cti: Fix hang in cti_disable_hw()")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/hwtracing/coresight/coresight-cti-core.c

@@ -94,6 +94,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
 	unsigned long flags;
 	int rc = 0;
 
+	pm_runtime_get_sync(dev->parent);
 	spin_lock_irqsave(&drvdata->spinlock, flags);
 
 	/* no need to do anything if enabled or unpowered*/
@@ -118,6 +119,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
 	/* cannot enable due to error */
 cti_err_not_enabled:
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
+	pm_runtime_put(dev->parent);
 	return rc;
 }
 
@@ -173,6 +175,7 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
 	coresight_disclaim_device_unlocked(csdev);
 	CS_LOCK(drvdata->base);
 	spin_unlock(&drvdata->spinlock);
+	pm_runtime_put(dev->parent);
 	return 0;
 
 	/* not disabled this call */