PCI: qcom: Disable write access to read only registers for IP v2.9.0

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.

While at it, let's also add a newline after existing dw_pcie_dbi_ro_wr_en()
guard function to align with rest of the driver.

Link: https://lore.kernel.org/r/20230619150408.8468-4-manivannan.sadhasivam@linaro.org
Fixes: 0cf7c2efe8ac ("PCI: qcom: Add IPQ60xx support")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 01795ee7ce454e3f533971ee9d3adf7cb4118639..391a45d1e70a6c7ec866510ee26f4b7498b57258 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1136,6 +1136,7 @@ static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
        writel(0, pcie->parf + PARF_Q2A_FLUSH);
 
        dw_pcie_dbi_ro_wr_en(pci);
+
        writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP);
 
        val = readl(pci->dbi_base + offset + PCI_EXP_LNKCAP);
@@ -1145,6 +1146,8 @@ static int qcom_pcie_post_init_2_9_0(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);
+
        for (i = 0; i < 256; i++)
                writel(0, pcie->parf + PARF_BDF_TO_SID_TABLE_N + (4 * i));