[PATCH v5 18/24] i2c: designware: Consolidate PM ops

[Andy Shevchenko]

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

*)
The semaphore is not used in the PCI driver at all. Hence shared_with_punit
is always false in the PCI case.

Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Tested-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231120144641.1660574-19-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/i2c/busses/i2c-designware-common.c  | 62 ++++++++++++++++++++
 drivers/i2c/busses/i2c-designware-core.h    |  5 +-
 drivers/i2c/busses/i2c-designware-pcidrv.c  | 44 +-------------
 drivers/i2c/busses/i2c-designware-platdrv.c | 64 +--------------------
 4 files changed, 69 insertions(+), 106 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index 5b1a597cb5dd..7c877e380605 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>
@@ -713,5 +714,66 @@ 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");
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 52667d670363..f6ebf86dcc6f 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/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>
 
@@ -337,7 +338,8 @@ int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev);
 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);
-void i2c_dw_disable(struct dw_i2c_dev *dev);
+
+extern const struct dev_pm_ops i2c_dw_dev_pm_ops;
 
 static inline void __i2c_dw_enable(struct dw_i2c_dev *dev)
 {
@@ -352,6 +354,7 @@ static inline void __i2c_dw_disable_nowait(struct dw_i2c_dev *dev)
 }
 
 void __i2c_dw_disable(struct dw_i2c_dev *dev);
+void i2c_dw_disable(struct dw_i2c_dev *dev);
 
 extern void i2c_dw_configure_master(struct dw_i2c_dev *dev);
 extern int i2c_dw_probe_master(struct dw_i2c_dev *dev);
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index 20571812d150..df47ba04c9ee 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/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,
 };
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 9b249d27841d..d9a64006a3d6 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/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"
@@ -349,67 +348,6 @@ static void dw_i2c_plat_remove(struct platform_device *pdev)
 	pm_runtime_put_sync(&pdev->dev);
 }
 
-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 },
@@ -451,7 +389,7 @@ 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,
 };
-- 
2.43.0.rc1.1.gbec44491f096