Messages in this thread Patch in this message | | | From | Pramod Gurav <> | Subject | [PATCH 1/2] spi: qup: Handle clocks in pm_runtime suspend and resume | Date | Mon, 2 May 2016 17:44:03 +0530 |
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Clocks must ne disabled in pm_runtime to achieve some power saving. Enable the clocks when the device is runtime resumed during a transfer.
Signed-off-by: Pramod Gurav <pramod.gurav@linaro.org> --- drivers/spi/spi-qup.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c index 810a7fa..e42ff61 100644 --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -937,6 +937,10 @@ static int spi_qup_pm_suspend_runtime(struct device *device) config = readl(controller->base + QUP_CONFIG); config |= QUP_CONFIG_CLOCK_AUTO_GATE; writel_relaxed(config, controller->base + QUP_CONFIG); + + clk_disable_unprepare(controller->cclk); + clk_disable_unprepare(controller->iclk); + return 0; } @@ -945,6 +949,15 @@ static int spi_qup_pm_resume_runtime(struct device *device) struct spi_master *master = dev_get_drvdata(device); struct spi_qup *controller = spi_master_get_devdata(master); u32 config; + int ret; + + ret = clk_prepare_enable(controller->iclk); + if (ret) + return ret; + + ret = clk_prepare_enable(controller->cclk); + if (ret) + return ret; /* Disable clocks auto gaiting */ config = readl_relaxed(controller->base + QUP_CONFIG); -- 1.8.2.1
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