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/20230619150408.8468-2-manivannan.sadhasivam@linaro.org
Fixes: 5d76117f070d ("PCI: qcom: Add support for IPQ8074 PCIe controller")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: <stable@vger.kernel.org>

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 4ab30892f6efbc70e8cf5b1f3475b9fed16cbccb..ef385d36d653e184f8be2266441b9d5b18d3a931 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/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;
 }