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Commit dae1a770 authored by Pramod Gurav's avatar Pramod Gurav Committed by Mark Brown
Browse files

spi: qup: Handle clocks in pm_runtime suspend and resume 



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: default avatarPramod Gurav <pramod.gurav@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f55532a0

drivers/spi/spi-qup.c

+13 −0
Original line number Diff line number Diff line
@@ -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);