When system enters VLLS mode, module power is turned off. As a result,
all registers are reset to HW default value. After exiting VLLS mode,
registers are still in default mode. As a result, the pinctrl settings
are incorrect, which will affect the module function.
The patch recovers the pinctrl setting when exit VLLS mode.
Signed-off-by: Gao Pan <pandy.gao@xxxxxxx>
---
V2:
-drop "#else branch" and IMX_LPI2C_PM completely
-pm = &imx_lpi2c_pm
V3:
-remove unnecessary #ifdef
drivers/i2c/busses/i2c-imx-lpi2c.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c62b7cd..5a85c49 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -636,12 +636,31 @@ static int lpi2c_imx_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int lpi2c_imx_suspend(struct device *dev)
+{
+ pinctrl_pm_select_sleep_state(dev);
+
+ return 0;
+}
+
+static int lpi2c_imx_resume(struct device *dev)
+{
+ pinctrl_pm_select_default_state(dev);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume);
+
static struct platform_driver lpi2c_imx_driver = {
.probe = lpi2c_imx_probe,
.remove = lpi2c_imx_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = lpi2c_imx_of_match,
+ .pm = &imx_lpi2c_pm,
},
};
--
1.9.1
--
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