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coresight: add PM runtime calls to coresight_simple_func()

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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>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-08-25 15:19:02 -06:00 committed by Greg Kroah-Hartman
parent 62d39ac934
commit cd9e3474bb
1 changed files with 6 additions and 2 deletions
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8
drivers/hwtracing/coresight/coresight-priv.h
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@ -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)