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Subject[PATCH] coresight: add PM runtime calls to coresight_simple_func()
Date
It is mandatory to enable a coresight block's power domain before
trying to access management registers. Otherwise the transaction
simply stalls, leading to a system hang.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/hwtracing/coresight/coresight-priv.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index ad975c58080d..b047241e7496 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -16,6 +16,7 @@
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/coresight.h>
+#include <linux/pm_runtime.h>

/*
* Coresight management registers (0xf00-0xfcc)
@@ -42,8 +43,10 @@ static ssize_t name##_show(struct device *_dev, \
struct device_attribute *attr, char *buf) \
{ \
type *drvdata = dev_get_drvdata(_dev->parent); \
+ pm_runtime_get_sync(_dev->parent); \
return scnprintf(buf, PAGE_SIZE, "0x%x\n", \
readl_relaxed(drvdata->base + offset)); \
+ pm_runtime_put_sync(_dev->parent); \
} \
static DEVICE_ATTR_RO(name)

--
2.5.0
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