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spi: stm32: fixes suspend/resume management

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[ Upstream commit db96bf976a4fc65439be0b4524c0d41427d98814 ]

This patch adds pinctrl power management, and reconfigure spi controller
in case of resume.

Fixes: 038ac869c9d2 ("spi: stm32: add runtime PM support")

Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Alain Volmat <alain.volmat@st.com>
Link: https://lore.kernel.org/r/1597043558-29668-5-git-send-email-alain.volmat@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Amelie Delaunay 2020-08-10 09:12:37 +02:00 committed by Greg Kroah-Hartman
parent 666d1d1a05
commit 233d6f2ab1
1 changed files with 24 additions and 3 deletions
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27
drivers/spi/spi-stm32.c
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@ -14,6 +14,7 @@
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/spi/spi.h>
@ -1986,6 +1987,8 @@ static int stm32_spi_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
pinctrl_pm_select_sleep_state(&pdev->dev);
return 0;
}
@ -1997,13 +2000,18 @@ static int stm32_spi_runtime_suspend(struct device *dev)
clk_disable_unprepare(spi->clk);
return 0;
return pinctrl_pm_select_sleep_state(dev);
}
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);
int ret;
ret = pinctrl_pm_select_default_state(dev);
if (ret)
return ret;
return clk_prepare_enable(spi->clk);
}
@ -2033,10 +2041,23 @@ static int stm32_spi_resume(struct device *dev)
return ret;
ret = spi_master_resume(master);
if (ret)
if (ret) {
clk_disable_unprepare(spi->clk);
return ret;
}
return ret;
ret = pm_runtime_get_sync(dev);
if (ret) {
dev_err(dev, "Unable to power device:%d\n", ret);
return ret;
}
spi->cfg->config(spi);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return 0;
}
#endif