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>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 810a7fae3479..e42ff613c0e0 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);