i2c: designware: Consolidate PM ops

We have the same (*) PM ops in the PCI and platform drivers.
Instead, consolidate that PM ops under exported variable and
deduplicate them.

*)
With the subtle ACPI and P-Unit behaviour differences in PCI case.
But this is not a problem as for ACPI we need to take care of the
P-Unit semaphore anyway and calling PM ops for PCI makes sense as
it might provide specific operation regions in ACPI (however there
are no known devices on market that are using it with PCI enabled I2C).
Note, the clocks are not in use in the PCI case.

Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Sanket Goswami <Sanket.Goswami@amd.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Author: andy-shev

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");

drivers/i2c/busses/i2c-designware-core.h

@@ -15,6 +15,7 @@
 #include <linux/dev_printk.h>
 #include <linux/errno.h>
 #include <linux/i2c.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/types.h>
 
@@ -341,6 +342,8 @@ int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev);
 int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev);
 u32 i2c_dw_func(struct i2c_adapter *adap);
 
+extern const struct dev_pm_ops i2c_dw_dev_pm_ops;
+
 static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
 {
 	dev->status |= STATUS_ACTIVE;

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/power_supply.h>
 #include <linux/sched.h>
@@ -194,47 +195,6 @@ static struct dw_pci_controller dw_pci_controllers[] = {
 	},
 };
 
-static int __maybe_unused i2c_dw_pci_runtime_suspend(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	i2c_dw_disable(i_dev);
-	return 0;
-}
-
-static int __maybe_unused i2c_dw_pci_suspend(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	i2c_mark_adapter_suspended(&i_dev->adapter);
-
-	return i2c_dw_pci_runtime_suspend(dev);
-}
-
-static int __maybe_unused i2c_dw_pci_runtime_resume(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	return i_dev->init(i_dev);
-}
-
-static int __maybe_unused i2c_dw_pci_resume(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-	int ret;
-
-	ret = i2c_dw_pci_runtime_resume(dev);
-
-	i2c_mark_adapter_resumed(&i_dev->adapter);
-
-	return ret;
-}
-
-static const struct dev_pm_ops i2c_dw_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(i2c_dw_pci_suspend, i2c_dw_pci_resume)
-	SET_RUNTIME_PM_OPS(i2c_dw_pci_runtime_suspend, i2c_dw_pci_runtime_resume, NULL)
-};
-
 static const struct property_entry dgpu_properties[] = {
 	/* USB-C doesn't power the system */
 	PROPERTY_ENTRY_U8("scope", POWER_SUPPLY_SCOPE_DEVICE),
@@ -402,7 +362,7 @@ static struct pci_driver dw_i2c_driver = {
 	.probe		= i2c_dw_pci_probe,
 	.remove		= i2c_dw_pci_remove,
 	.driver         = {
-		.pm     = &i2c_dw_pm_ops,
+		.pm	= pm_ptr(&i2c_dw_dev_pm_ops),
 	},
 	.id_table	= i2c_designware_pci_ids,
 };

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -29,7 +29,6 @@
 #include <linux/reset.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/suspend.h>
 #include <linux/units.h>
 
 #include "i2c-designware-core.h"
@@ -339,67 +338,6 @@ static void dw_i2c_plat_remove(struct platform_device *pdev)
 	reset_control_assert(dev->rst);
 }
 
-static int dw_i2c_plat_prepare(struct device *dev)
-{
-	/*
-	 * 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(dev);
-}
-
-static int dw_i2c_plat_runtime_suspend(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	if (i_dev->shared_with_punit)
-		return 0;
-
-	i2c_dw_disable(i_dev);
-	i2c_dw_prepare_clk(i_dev, false);
-
-	return 0;
-}
-
-static int dw_i2c_plat_suspend(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	i2c_mark_adapter_suspended(&i_dev->adapter);
-
-	return dw_i2c_plat_runtime_suspend(dev);
-}
-
-static int dw_i2c_plat_runtime_resume(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	if (!i_dev->shared_with_punit)
-		i2c_dw_prepare_clk(i_dev, true);
-
-	i_dev->init(i_dev);
-
-	return 0;
-}
-
-static int dw_i2c_plat_resume(struct device *dev)
-{
-	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
-
-	dw_i2c_plat_runtime_resume(dev);
-	i2c_mark_adapter_resumed(&i_dev->adapter);
-
-	return 0;
-}
-
-static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
-	.prepare = pm_sleep_ptr(dw_i2c_plat_prepare),
-	LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
-	RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend, dw_i2c_plat_runtime_resume, NULL)
-};
-
 static const struct of_device_id dw_i2c_of_match[] = {
 	{ .compatible = "snps,designware-i2c", },
 	{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
@@ -442,7 +380,7 @@ static struct platform_driver dw_i2c_driver = {
 		.name	= "i2c_designware",
 		.of_match_table = dw_i2c_of_match,
 		.acpi_match_table = dw_i2c_acpi_match,
-		.pm	= pm_ptr(&dw_i2c_dev_pm_ops),
+		.pm	= pm_ptr(&i2c_dw_dev_pm_ops),
 	},
 	.id_table = dw_i2c_platform_ids,
 };