i2c: designware: Uniform initialization flow for polling mode

Currently initialization flow in i2c_dw_probe_master() skips a few steps
and has code duplication for polling mode implementation.

Simplify this by adding a new ACCESS_POLLING flag that is set for those
two platforms that currently use polling mode and use it to skip
interrupt handler setup.

Signed-off-by: Jarkko Nikula <[email protected]>
Tested-by: Jiawen Wu <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>

Author: jhnikula

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

@@ -303,6 +303,7 @@ struct dw_i2c_dev {
 #define ACCESS_INTR_MASK			BIT(0)
 #define ACCESS_NO_IRQ_SUSPEND			BIT(1)
 #define ARBITRATION_SEMAPHORE			BIT(2)
+#define ACCESS_POLLING				BIT(3)
 
 #define MODEL_MSCC_OCELOT			BIT(8)
 #define MODEL_BAIKAL_BT1			BIT(9)

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

@@ -953,31 +953,6 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
 	return 0;
 }
 
-static int i2c_dw_poll_adap_quirk(struct dw_i2c_dev *dev)
-{
-	struct i2c_adapter *adap = &dev->adapter;
-	int ret;
-
-	pm_runtime_get_noresume(dev->dev);
-	ret = i2c_add_numbered_adapter(adap);
-	if (ret)
-		dev_err(dev->dev, "Failed to add adapter: %d\n", ret);
-	pm_runtime_put_noidle(dev->dev);
-
-	return ret;
-}
-
-static bool i2c_dw_is_model_poll(struct dw_i2c_dev *dev)
-{
-	switch (dev->flags & MODEL_MASK) {
-	case MODEL_AMD_NAVI_GPU:
-	case MODEL_WANGXUN_SP:
-		return true;
-	default:
-		return false;
-	}
-}
-
 int i2c_dw_probe_master(struct dw_i2c_dev *dev)
 {
 	struct i2c_adapter *adap = &dev->adapter;
@@ -1033,9 +1008,6 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
 	adap->dev.parent = dev->dev;
 	i2c_set_adapdata(adap, dev);
 
-	if (i2c_dw_is_model_poll(dev))
-		return i2c_dw_poll_adap_quirk(dev);
-
 	if (dev->flags & ACCESS_NO_IRQ_SUSPEND) {
 		irq_flags = IRQF_NO_SUSPEND;
 	} else {
@@ -1049,12 +1021,14 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
 	regmap_write(dev->map, DW_IC_INTR_MASK, 0);
 	i2c_dw_release_lock(dev);
 
-	ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
-			       dev_name(dev->dev), dev);
-	if (ret) {
-		dev_err(dev->dev, "failure requesting irq %i: %d\n",
-			dev->irq, ret);
-		return ret;
+	if (!(dev->flags & ACCESS_POLLING)) {
+		ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
+				       irq_flags, dev_name(dev->dev), dev);
+		if (ret) {
+			dev_err(dev->dev, "failure requesting irq %i: %d\n",
+				dev->irq, ret);
+			return ret;
+		}
 	}
 
 	ret = i2c_dw_init_recovery_info(dev);

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

@@ -154,7 +154,7 @@ static int navi_amd_setup(struct pci_dev *pdev, struct dw_pci_controller *c)
 {
 	struct dw_i2c_dev *dev = dev_get_drvdata(&pdev->dev);
 
-	dev->flags |= MODEL_AMD_NAVI_GPU;
+	dev->flags |= MODEL_AMD_NAVI_GPU | ACCESS_POLLING;
 	dev->timings.bus_freq_hz = I2C_MAX_STANDARD_MODE_FREQ;
 	return 0;
 }

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

@@ -290,7 +290,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 
 	dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
 	if (device_property_present(&pdev->dev, "wx,i2c-snps-model"))
-		dev->flags = MODEL_WANGXUN_SP;
+		dev->flags = MODEL_WANGXUN_SP | ACCESS_POLLING;
 
 	dev->dev = &pdev->dev;
 	dev->irq = irq;