coresight: cti: Remove hw_powered flag

Since the CPU PM code has been removed from the CTI driver and the device
is enabled via runtime PM, pm_runtime_active() can be used to check
whether the device is powered.

As a result, the hw_powered flag is redundant, remove it.

Reviewed-by: Mike Leach <mike.leach@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260226-arm_coresight_cti_refactor_v1-v2-6-b30fada3cfec@arm.com

3 files changed, 13 insertions, 33 deletions

diff --git a/drivers/hwtracing/coresight/coresight-cti-core.c b/drivers/hwtracing/coresight/coresight-cti-core.c
index 28f995263433..5ac36f077618 100644
--- a/drivers/hwtracing/coresight/coresight-cti-core.c
+++ b/drivers/hwtracing/coresight/coresight-cti-core.c
@@ -80,8 +80,8 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
 
 	guard(raw_spinlock_irqsave)(&drvdata->spinlock);
 
-	/* no need to do anything if enabled or unpowered*/
-	if (config->hw_enabled || !config->hw_powered)
+	/* no need to do anything if enabled */
+	if (config->hw_enabled)
 		goto cti_state_unchanged;
 
 	/* claim the device */
@@ -114,8 +114,8 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
 	if (--drvdata->config.enable_req_count > 0)
 		return 0;
 
-	/* no need to do anything if disabled or cpu unpowered */
-	if (!config->hw_enabled || !config->hw_powered)
+	/* no need to do anything if disabled */
+	if (!config->hw_enabled)
 		return 0;
 
 	CS_UNLOCK(drvdata->base);
@@ -702,9 +702,6 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
 		return  PTR_ERR(pdata);
 	}
 
-	/* default to powered - could change on PM notifications */
-	drvdata->config.hw_powered = true;
-
 	/*
 	 * Set up device name - will depend if cpu bound or otherwise.
 	 *
diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
index a22cc9a2bee2..9ab586a5c9a4 100644
--- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
@@ -81,19 +81,12 @@ static ssize_t enable_show(struct device *dev,
 			   char *buf)
 {
 	int enable_req;
-	bool enabled, powered;
 	struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
 
-	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock) {
+	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock)
 		enable_req = drvdata->config.enable_req_count;
-		powered = drvdata->config.hw_powered;
-		enabled = drvdata->config.hw_enabled;
-	}
 
-	if (powered)
-		return sprintf(buf, "%d\n", enabled);
-	else
-		return sprintf(buf, "%d\n", !!enable_req);
+	return sprintf(buf, "%d\n", !!enable_req);
 }
 
 static ssize_t enable_store(struct device *dev,
@@ -131,11 +124,7 @@ static ssize_t powered_show(struct device *dev,
 			    struct device_attribute *attr,
 			    char *buf)
 {
-	bool powered;
-	struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
-
-	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock)
-		powered = drvdata->config.hw_powered;
+	bool powered = pm_runtime_active(dev->parent);
 
 	return sprintf(buf, "%d\n", powered);
 }
@@ -181,10 +170,8 @@ static ssize_t coresight_cti_reg_show(struct device *dev,
 
 	pm_runtime_get_sync(dev->parent);
 
-	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock) {
-		if (drvdata->config.hw_powered)
-			val = cti_read_single_reg(drvdata, cti_attr->off);
-	}
+	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock)
+		val = cti_read_single_reg(drvdata, cti_attr->off);
 
 	pm_runtime_put_sync(dev->parent);
 	return sysfs_emit(buf, "0x%x\n", val);
@@ -204,10 +191,8 @@ static __maybe_unused ssize_t coresight_cti_reg_store(struct device *dev,
 
 	pm_runtime_get_sync(dev->parent);
 
-	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock) {
-		if (drvdata->config.hw_powered)
-			cti_write_single_reg(drvdata, cti_attr->off, val);
-	}
+	scoped_guard(raw_spinlock_irqsave, &drvdata->spinlock)
+		cti_write_single_reg(drvdata, cti_attr->off, val);
 
 	pm_runtime_put_sync(dev->parent);
 	return size;
diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
index 2edc0d01812c..8754cb5def79 100644
--- a/drivers/hwtracing/coresight/coresight-cti.h
+++ b/drivers/hwtracing/coresight/coresight-cti.h
@@ -122,7 +122,6 @@ struct cti_device {
  * @asicctl_impl: true if asicctl is implemented.
  * @enable_req_count: CTI is enabled alongside >=1 associated devices.
  * @hw_enabled: true if hw is currently enabled.
- * @hw_powered: true if associated cpu powered on, or no cpu.
  * @trig_in_use: bitfield of in triggers registered as in use.
  * @trig_out_use: bitfield of out triggers registered as in use.
  * @trig_out_filter: bitfield of out triggers that are blocked if filter
@@ -146,7 +145,6 @@ struct cti_config {
 	/* cti enable control */
 	int enable_req_count;
 	bool hw_enabled;
-	bool hw_powered;
 
 	/* registered triggers and filtering */
 	u32 trig_in_use;
@@ -235,10 +233,10 @@ struct coresight_platform_data *
 coresight_cti_get_platform_data(struct device *dev);
 const char *cti_plat_get_node_name(struct fwnode_handle *fwnode);
 
-/* cti powered and enabled */
+/* Check if a cti device is enabled */
 static inline bool cti_is_active(struct cti_config *cfg)
 {
-	return cfg->hw_powered && cfg->hw_enabled;
+	return cfg->hw_enabled;
 }
 
 #endif  /* _CORESIGHT_CORESIGHT_CTI_H */