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spi: stm32: add runtime PM support 

This patch reworks suspend and resume callbacks and add runtime_suspend
and runtime_resume callbacks.

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Amelie Delaunay 2017-06-27 17:45:18 +02:00 committed by Mark Brown
parent 128ebb89c5
commit 038ac869c9
1 changed files with 36 additions and 7 deletions
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43
drivers/spi/spi-stm32.c
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@ -27,6 +27,7 @@
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/spi/spi.h>
@ -1164,6 +1165,9 @@ static int stm32_spi_probe(struct platform_device *pdev)
if (spi->dma_tx || spi->dma_rx)
master->can_dma = stm32_spi_can_dma;
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret) {
dev_err(&pdev->dev, "spi master registration failed: %d\n",
@ -1203,6 +1207,8 @@ static int stm32_spi_probe(struct platform_device *pdev)
dma_release_channel(spi->dma_tx);
if (spi->dma_rx)
dma_release_channel(spi->dma_rx);
pm_runtime_disable(&pdev->dev);
err_clk_disable:
clk_disable_unprepare(spi->clk);
err_master_put:
@ -1225,23 +1231,42 @@ static int stm32_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(spi->clk);
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
static int stm32_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct stm32_spi *spi = spi_master_get_devdata(master);
clk_disable_unprepare(spi->clk);
return 0;
}
static int stm32_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct stm32_spi *spi = spi_master_get_devdata(master);
return clk_prepare_enable(spi->clk);
}
#endif
#ifdef CONFIG_PM_SLEEP
static int stm32_spi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct stm32_spi *spi = spi_master_get_devdata(master);
int ret;
ret = spi_master_suspend(master);
if (ret)
return ret;
clk_disable_unprepare(spi->clk);
return ret;
return pm_runtime_force_suspend(dev);
}
static int stm32_spi_resume(struct device *dev)
@ -1250,9 +1275,10 @@ static int stm32_spi_resume(struct device *dev)
struct stm32_spi *spi = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(spi->clk);
ret = pm_runtime_force_resume(dev);
if (ret)
return ret;
ret = spi_master_resume(master);
if (ret)
clk_disable_unprepare(spi->clk);
@ -1261,8 +1287,11 @@ static int stm32_spi_resume(struct device *dev)
}
#endif
static SIMPLE_DEV_PM_OPS(stm32_spi_pm_ops,
stm32_spi_suspend, stm32_spi_resume);
static const struct dev_pm_ops stm32_spi_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(stm32_spi_suspend, stm32_spi_resume)
SET_RUNTIME_PM_OPS(stm32_spi_runtime_suspend,
stm32_spi_runtime_resume, NULL)
};
static struct platform_driver stm32_spi_driver = {
.probe = stm32_spi_probe,