diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-08-25 23:19:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 13:05:42 +0200 |
| commit | cd9e3474bb793dc93fbe0985f822ad4b2605e847 (patch) | |
| tree | c26eae33b81de772287eba0fdc73bd7cd1245ba0 | |
| parent | coresight: delay initialisation when children are missing (diff) | |
| download | linux-cd9e3474bb793dc93fbe0985f822ad4b2605e847.tar.xz linux-cd9e3474bb793dc93fbe0985f822ad4b2605e847.zip | |
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@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-priv.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h index ad975c58080d..decfd52b5dc3 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 +43,11 @@ 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) |