i2c: designware: Remove interrupt clearing from i2c_dw_pci_probe()

There is no need to clear interrupts in i2c_dw_pci_probe() since only place
where interrupts are unmasked is i2c_dw_xfer_init() and there interrupts
are always cleared after commit 2a2d95e9 ("i2c: designware: always
clear interrupts before enabling them").

This allows to cleanup the code and replace i2c_dw_clear_int() in
i2c_dw_xfer_init() by direct register read as there are no other callers.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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

@@ -438,7 +438,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 	__i2c_dw_enable(dev, true);
 
 	/* Clear and enable interrupts */
-	i2c_dw_clear_int(dev);
+	dw_readl(dev, DW_IC_CLR_INTR);
 	dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
 }
 
@@ -839,12 +839,6 @@ void i2c_dw_disable(struct dw_i2c_dev *dev)
 }
 EXPORT_SYMBOL_GPL(i2c_dw_disable);
 
-void i2c_dw_clear_int(struct dw_i2c_dev *dev)
-{
-	dw_readl(dev, DW_IC_CLR_INTR);
-}
-EXPORT_SYMBOL_GPL(i2c_dw_clear_int);
-
 void i2c_dw_disable_int(struct dw_i2c_dev *dev)
 {
 	dw_writel(dev, 0, DW_IC_INTR_MASK);

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

@@ -122,7 +122,6 @@ extern irqreturn_t i2c_dw_isr(int this_irq, void *dev_id);
 extern void i2c_dw_enable(struct dw_i2c_dev *dev);
 extern u32 i2c_dw_is_enabled(struct dw_i2c_dev *dev);
 extern void i2c_dw_disable(struct dw_i2c_dev *dev);
-extern void i2c_dw_clear_int(struct dw_i2c_dev *dev);
 extern void i2c_dw_disable_int(struct dw_i2c_dev *dev);
 extern u32 i2c_dw_read_comp_param(struct dw_i2c_dev *dev);
 

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

@@ -268,7 +268,6 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 	}
 
 	i2c_dw_disable_int(dev);
-	i2c_dw_clear_int(dev);
 	r = i2c_add_numbered_adapter(adap);
 	if (r) {
 		dev_err(&pdev->dev, "failure adding adapter\n");