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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: Pramod Gurav <pramod.gurav@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Pramod Gurav 2016-05-02 17:44:03 +05:30 committed by Mark Brown
parent f55532a0c0
commit dae1a7700b
1 changed files with 13 additions and 0 deletions
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13
drivers/spi/spi-qup.c
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@ -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);