[PATCH 4/5] spi: stm32: fixes suspend/resume management

[Alain Volmat]

From: Amelie Delaunay <amelie.delau...@st.com>

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.delau...@st.com>
Signed-off-by: Alain Volmat <alain.vol...@st.com>
---
 drivers/spi/spi-stm32.c | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index bdd4e70c3f10..e196dbc5c432 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -13,6 +13,7 @@
 #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>
@@ -2004,6 +2005,8 @@ static int stm32_spi_remove(struct platform_device *pdev)
 
        pm_runtime_disable(&pdev->dev);
 
+       pinctrl_pm_select_sleep_state(&pdev->dev);
+
        return 0;
 }
 
@@ -2015,13 +2018,18 @@ 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);
 }
@@ -2051,10 +2059,23 @@ 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
 
-- 
2.7.4