From mboxrd@z Thu Jan 1 00:00:00 1970 From: mathieu.poirier@linaro.org (mathieu.poirier at linaro.org) Date: Tue, 6 Jan 2015 09:37:09 -0700 Subject: [PATCH 5/9] coresight-tpiu: Adding runtime PM awareness In-Reply-To: <1420562233-2015-1-git-send-email-mathieu.poirier@linaro.org> References: <1420562233-2015-1-git-send-email-mathieu.poirier@linaro.org> Message-ID: <1420562233-2015-6-git-send-email-mathieu.poirier@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Mathieu Poirier 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 --- drivers/coresight/coresight-tpiu.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/coresight/coresight-tpiu.c b/drivers/coresight/coresight-tpiu.c index ae101082791a..199244700c99 100644 --- a/drivers/coresight/coresight-tpiu.c +++ b/drivers/coresight/coresight-tpiu.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "coresight-priv.h" @@ -78,6 +79,7 @@ static int tpiu_enable(struct coresight_device *csdev) if (ret) return ret; + pm_runtime_get_sync(drvdata->dev); tpiu_enable_hw(drvdata); dev_info(drvdata->dev, "TPIU enabled\n"); @@ -101,7 +103,7 @@ static void tpiu_disable(struct coresight_device *csdev) struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); tpiu_disable_hw(drvdata); - + pm_runtime_put_sync(drvdata->dev); clk_disable_unprepare(drvdata->clk); dev_info(drvdata->dev, "TPIU disabled\n"); @@ -171,6 +173,9 @@ static int tpiu_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, "TPIU initialized\n"); return 0; } -- 1.9.1