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author | Pramod Gurav <pramod.gurav@linaro.org> | 2016-05-02 12:14:03 (GMT) |
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committer | Mark Brown <broonie@kernel.org> | 2016-05-02 14:27:28 (GMT) |
commit | dae1a7700b34eceae049cf8f1567a640528ca4c1 (patch) | |
tree | b03cbe5502dfe7f7e116f6c46e98f8cbc9d6c4bb /drivers/spi/spi-qup.c | |
parent | f55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff) | |
download | linux-dae1a7700b34eceae049cf8f1567a640528ca4c1.tar.xz |
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>
Diffstat (limited to 'drivers/spi/spi-qup.c')
-rw-r--r-- | drivers/spi/spi-qup.c | 13 |
1 files changed, 13 insertions, 0 deletions
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); |