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Commit cd9e3474 authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Greg Kroah-Hartman
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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: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 62d39ac9

drivers/hwtracing/coresight/coresight-priv.h

+6 −2
Original line number Diff line number Diff line
@@ -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 +43,11 @@ static ssize_t name##_show(struct device *_dev, \ 
			   struct device_attribute *attr, char *buf)	\

{									\

	type *drvdata = dev_get_drvdata(_dev->parent);			\

	return scnprintf(buf, PAGE_SIZE, "0x%x\n",			\

			 readl_relaxed(drvdata->base + offset));	\

	u32 val;							\

	pm_runtime_get_sync(_dev->parent);				\

	val = readl_relaxed(drvdata->base + offset);			\

	pm_runtime_put_sync(_dev->parent);				\

	return scnprintf(buf, PAGE_SIZE, "0x%x\n", val);		\

}									\

static DEVICE_ATTR_RO(name)