From: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org

[ Upstream commit a33d700e8eea76c62120cb3dbf5e01328f18319a ]

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... 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/dwc/pcie-qcom.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/dwc/pcie-qcom.c b/drivers/pci/dwc/pcie-qcom.c index fe710f83e59bc..431bc0e4d3eec 100644 --- a/drivers/pci/dwc/pcie-qcom.c +++ b/drivers/pci/dwc/pcie-qcom.c @@ -730,6 +730,8 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie) if (IS_ERR(res->phy_ahb_reset)) return PTR_ERR(res->phy_ahb_reset);

+ dw_pcie_dbi_ro_wr_dis(pci); + return 0; }