PCI: qcom: Disable write access to read only registers for IP v2.3.3

In the post init sequence of v2.9.0, write access to read only registers
are not disabled after updating the registers. Fix it by disabling the
access after register update.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 5d76117 ("PCI: qcom: Add support for IPQ8074 PCIe controller")
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Cc: <[email protected]>

Author: Mani-Sadhasivam

drivers/pci/controller/dwc/pcie-qcom.c

@@ -836,6 +836,8 @@ static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
 	writel(PCI_EXP_DEVCTL2_COMP_TMOUT_DIS, pci->dbi_base + offset +
 		PCI_EXP_DEVCTL2);
 
+	dw_pcie_dbi_ro_wr_dis(pci);
+
 	return 0;
 }