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Subject[PATCH 3/9] coresight-funnel: Adding runtime PM awareness
Date
From: Mathieu Poirier <mathieu.poirier@linaro.org>

Using the runtime API whenever HW access is required. As
such and by associating a coresight component to a power
domain in the device tree, faults associated to accessing
unpowered devices are mitigated.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/coresight/coresight-funnel.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/coresight/coresight-funnel.c b/drivers/coresight/coresight-funnel.c
index 2108edffe1f4..b655ecfb23c6 100644
--- a/drivers/coresight/coresight-funnel.c
+++ b/drivers/coresight/coresight-funnel.c
@@ -21,6 +21,7 @@
#include <linux/clk.h>
#include <linux/coresight.h>
#include <linux/amba/bus.h>
+#include <linux/pm_runtime.h>

#include "coresight-priv.h"

@@ -73,6 +74,7 @@ static int funnel_enable(struct coresight_device *csdev, int inport,
if (ret)
return ret;

+ pm_runtime_get_sync(drvdata->dev);
funnel_enable_hw(drvdata, inport);

dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
@@ -98,7 +100,7 @@ static void funnel_disable(struct coresight_device *csdev, int inport,
struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

funnel_disable_hw(drvdata, inport);
-
+ pm_runtime_put_sync(drvdata->dev);
clk_disable_unprepare(drvdata->clk);

dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
@@ -161,8 +163,10 @@ static ssize_t funnel_ctrl_show(struct device *dev,
if (ret)
return ret;

+ pm_runtime_get_sync(drvdata->dev);
val = get_funnel_ctrl_hw(drvdata);
clk_disable_unprepare(drvdata->clk);
+ pm_runtime_put_sync(drvdata->dev);

return sprintf(buf, "%#x\n", val);
}
@@ -222,6 +226,9 @@ static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);

+ pm_runtime_set_suspended(dev);
+ pm_runtime_put_noidle(dev);
+
dev_info(dev, "FUNNEL initialized\n");
return 0;
}
--
1.9.1


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