PCI: dwc: dra7xx: Use RW1C for IRQSTATUS_MSI and IRQSTATUS_MAIN

Previously, we tried to clear interrupt requests by clearing bits in the
PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI and PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN
registers.  But per the TRM, these fields are RW1C, so we must *set* bits
to clear the interrupt bits.

Fixes: 47ff3de9 ("PCI: dra7xx: Add TI DRA7xx PCIe driver")
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/pci/dwc/pci-dra7xx.c

@@ -174,7 +174,7 @@ static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
 static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
 {
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
-			   ~LEG_EP_INTERRUPTS & ~MSI);
+			   LEG_EP_INTERRUPTS | MSI);
 
 	dra7xx_pcie_writel(dra7xx,
 			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
@@ -184,7 +184,7 @@ static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
 static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
 {
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
-			   ~INTERRUPTS);
+			   INTERRUPTS);
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
 			   INTERRUPTS);
 }