coresight: etb: let runtime PM handle core clock
This uses runtime PM to manage the PCLK ("amba_pclk") instead
of screwing around with the framework by going in and taking
a copy from the amba device. The amba bus core will unprepare
and disable the clock when the device is unused when
CONFIG_PM is selected, else the clock will be always on.
Prior to this patch, as the AMBA primecell bus code enables
the PCLK, it would be left on after probe as
the clk_prepare_enable() and clk_disable_unprepare() was
called and thus just increase and decreas the refcount by
one, without it reaching zero and actually disabling the
clock. Now the runtime PM callbacks will make sure the PCLK
is properly disabled after probe.
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 2a77d83..df306ae 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -22,7 +22,7 @@
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
-#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include <linux/seq_file.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
@@ -68,7 +68,6 @@
* @dev: the device entity associated to this component.
* @csdev: component vitals needed by the framework.
* @miscdev: specifics to handle "/dev/xyz.etb" entry.
- * @clk: the clock this component is associated to.
* @spinlock: only one at a time pls.
* @in_use: synchronise user space access to etb buffer.
* @buf: area of memory where ETB buffer content gets sent.
@@ -81,7 +80,6 @@
struct device *dev;
struct coresight_device *csdev;
struct miscdevice miscdev;
- struct clk *clk;
spinlock_t spinlock;
atomic_t in_use;
u8 *buf;
@@ -92,17 +90,14 @@
static unsigned int etb_get_buffer_depth(struct etb_drvdata *drvdata)
{
- int ret;
u32 depth = 0;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
+ pm_runtime_get_sync(drvdata->dev);
/* RO registers don't need locking */
depth = readl_relaxed(drvdata->base + ETB_RAM_DEPTH_REG);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
return depth;
}
@@ -137,12 +132,9 @@
static int etb_enable(struct coresight_device *csdev)
{
struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
- int ret;
unsigned long flags;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
+ pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
etb_enable_hw(drvdata);
@@ -252,7 +244,7 @@
drvdata->enable = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
dev_info(drvdata->dev, "ETB disabled\n");
}
@@ -339,16 +331,12 @@
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- int ret;
unsigned long flags;
u32 etb_rdr, etb_sr, etb_rrp, etb_rwp;
u32 etb_trg, etb_cr, etb_ffsr, etb_ffcr;
struct etb_drvdata *drvdata = dev_get_drvdata(dev->parent);
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- goto out;
-
+ pm_runtime_get_sync(drvdata->dev);
spin_lock_irqsave(&drvdata->spinlock, flags);
CS_UNLOCK(drvdata->base);
@@ -364,7 +352,7 @@
CS_LOCK(drvdata->base);
spin_unlock_irqrestore(&drvdata->spinlock, flags);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(drvdata->dev);
return sprintf(buf,
"Depth:\t\t0x%x\n"
@@ -377,7 +365,7 @@
"Flush ctrl:\t0x%x\n",
etb_rdr, etb_sr, etb_rrp, etb_rwp,
etb_trg, etb_cr, etb_ffsr, etb_ffcr);
-out:
+
return -EINVAL;
}
static DEVICE_ATTR_RO(status);
@@ -449,13 +437,8 @@
spin_lock_init(&drvdata->spinlock);
- drvdata->clk = adev->pclk;
- ret = clk_prepare_enable(drvdata->clk);
- if (ret)
- return ret;
-
drvdata->buffer_depth = etb_get_buffer_depth(drvdata);
- clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put(&adev->dev);
if (drvdata->buffer_depth & 0x80000000)
return -EINVAL;