From cd9e3474bb793dc93fbe0985f822ad4b2605e847 Mon Sep 17 00:00:00 2001 From: Mathieu Poirier Date: Thu, 25 Aug 2016 15:19:02 -0600 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 Reviewed-by: Sudeep Holla Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-priv.h | 8 ++++++-- 1 file 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 #include #include +#include /* * 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) -- 2.20.1