1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index b60c55587e48..fb65fe6d8122 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
@@ -736,5 +737,66 @@ void i2c_dw_disable(struct dw_i2c_dev *dev)
 }
 EXPORT_SYMBOL_GPL(i2c_dw_disable);
 
+static int i2c_dw_prepare(struct device *device)
+{
+	/*
+	 * If the ACPI companion device object is present for this device,
+	 * it may be accessed during suspend and resume of other devices via
+	 * I2C operation regions, so tell the PM core and middle layers to
+	 * avoid skipping system suspend/resume callbacks for it in that case.
+	 */
+	return !has_acpi_companion(device);
+}
+
+static int i2c_dw_runtime_suspend(struct device *device)
+{
+	struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+	if (dev->shared_with_punit)
+		return 0;
+
+	i2c_dw_disable(dev);
+	i2c_dw_prepare_clk(dev, false);
+
+	return 0;
+}
+
+static int i2c_dw_suspend(struct device *device)
+{
+	struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+	i2c_mark_adapter_suspended(&dev->adapter);
+
+	return i2c_dw_runtime_suspend(device);
+}
+
+static int i2c_dw_runtime_resume(struct device *device)
+{
+	struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+	if (!dev->shared_with_punit)
+		i2c_dw_prepare_clk(dev, true);
+
+	dev->init(dev);
+
+	return 0;
+}
+
+static int i2c_dw_resume(struct device *device)
+{
+	struct dw_i2c_dev *dev = dev_get_drvdata(device);
+
+	i2c_dw_runtime_resume(device);
+	i2c_mark_adapter_resumed(&dev->adapter);
+
+	return 0;
+}
+
+EXPORT_GPL_DEV_PM_OPS(i2c_dw_dev_pm_ops) = {
+	.prepare = pm_sleep_ptr(i2c_dw_prepare),
+	LATE_SYSTEM_SLEEP_PM_OPS(i2c_dw_suspend, i2c_dw_resume)
+	RUNTIME_PM_OPS(i2c_dw_runtime_suspend, i2c_dw_runtime_resume, NULL)
+};
+
 MODULE_DESCRIPTION("Synopsys DesignWare I2C bus adapter core");
 MODULE_LICENSE("GPL");