PCI: qcom: Add missing reset for ipq806x

Add missing ext reset used by ipq8064 SoC in PCIe qcom driver.

Link: https://lore.kernel.org/r/20200615210608.21469-5-ansuelsmth@gmail.com
Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: stable@vger.kernel.org # v4.5+

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index bae5158..fcd2650 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -95,6 +95,7 @@ struct qcom_pcie_resources_2_1_0 {
        struct reset_control *ahb_reset;
        struct reset_control *por_reset;
        struct reset_control *phy_reset;
+       struct reset_control *ext_reset;
        struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
 };
 
@@ -272,6 +273,10 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
        if (IS_ERR(res->por_reset))
                return PTR_ERR(res->por_reset);
 
+       res->ext_reset = devm_reset_control_get_optional_exclusive(dev, "ext");
+       if (IS_ERR(res->ext_reset))
+               return PTR_ERR(res->ext_reset);
+
        res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
        return PTR_ERR_OR_ZERO(res->phy_reset);
 }
@@ -285,6 +290,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
        reset_control_assert(res->axi_reset);
        reset_control_assert(res->ahb_reset);
        reset_control_assert(res->por_reset);
+       reset_control_assert(res->ext_reset);
        reset_control_assert(res->phy_reset);
        clk_disable_unprepare(res->iface_clk);
        clk_disable_unprepare(res->core_clk);
@@ -343,6 +349,12 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
                goto err_deassert_ahb;
        }
 
+       ret = reset_control_deassert(res->ext_reset);
+       if (ret) {
+               dev_err(dev, "cannot deassert ext reset\n");
+               goto err_deassert_ahb;
+       }
+
        /* enable PCIe clocks and resets */
        val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
        val &= ~BIT(0);