OpenWrt – Rev 4

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From 490d103232287eb51c92c49a4ef8865fd0a9d59e Mon Sep 17 00:00:00 2001
From: Sham Muthayyan <smuthayy@codeaurora.org>
Date: Tue, 19 Jul 2016 18:58:18 +0530
Subject: PCI: qcom: Fixed IPQ806x PCIE reset changes

Change-Id: Ia6590e960b9754b1e8b7a51f318788cd63e9e321
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
---
 drivers/pci/host/pcie-qcom.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -98,6 +98,7 @@ 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 *vdda;
        struct regulator *vdda_phy;
        struct regulator *vdda_refclk;
@@ -275,6 +276,10 @@ static int qcom_pcie_get_resources_2_1_0
        if (IS_ERR(res->por_reset))
                return PTR_ERR(res->por_reset);
 
+       res->ext_reset = devm_reset_control_get(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);
 }
@@ -288,6 +293,7 @@ static void qcom_pcie_deinit_2_1_0(struc
        reset_control_assert(res->ahb_reset);
        reset_control_assert(res->por_reset);
        reset_control_assert(res->pci_reset);
+       reset_control_assert(res->ext_reset);
        clk_disable_unprepare(res->iface_clk);
        clk_disable_unprepare(res->core_clk);
        clk_disable_unprepare(res->phy_clk);
@@ -306,6 +312,12 @@ static int qcom_pcie_init_2_1_0(struct q
        u32 val;
        int ret;
 
+       ret = reset_control_assert(res->ahb_reset);
+       if (ret) {
+               dev_err(dev, "cannot assert ahb reset\n");
+               return ret;
+       }
+
        ret = regulator_enable(res->vdda);
        if (ret) {
                dev_err(dev, "cannot enable vdda regulator\n");
@@ -324,16 +336,16 @@ static int qcom_pcie_init_2_1_0(struct q
                goto err_vdda_phy;
        }
 
-       ret = reset_control_assert(res->ahb_reset);
+       ret = reset_control_deassert(res->ext_reset);
        if (ret) {
-               dev_err(dev, "cannot assert ahb reset\n");
-               goto err_assert_ahb;
+               dev_err(dev, "cannot assert ext reset\n");
+               goto err_reset_ext;
        }
 
        ret = clk_prepare_enable(res->iface_clk);
        if (ret) {
                dev_err(dev, "cannot prepare/enable iface clock\n");
-               goto err_assert_ahb;
+               goto err_iface;
        }
 
        ret = clk_prepare_enable(res->core_clk);
@@ -422,7 +434,9 @@ err_clk_phy:
        clk_disable_unprepare(res->core_clk);
 err_clk_core:
        clk_disable_unprepare(res->iface_clk);
-err_assert_ahb:
+err_iface:
+       reset_control_assert(res->ext_reset);
+err_reset_ext:
        regulator_disable(res->vdda_phy);
 err_vdda_phy:
        regulator_disable(res->vdda_refclk);