linux-kernel - [PATCH] coresight: add PM runtime calls to coresight_simple

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Message-Id: <1466185307-19539-1-git-send-email-mathieu.poirier@linaro.org>
Date:	Fri, 17 Jun 2016 11:41:47 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] coresight: add PM runtime calls to coresight_simple_func()

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@...aro.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