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>

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 810a7fae347988a7d9dc1101586234b8ef8efc77..e42ff613c0e0938ceca65236ef674ea3d6404c32 100644 (file)
--- 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);