linux-kernel - [PATCH 5.4 095/214] PCI: qcom: Add missing reset for ipq806x

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Message-Id: <20200901150957.545928126@linuxfoundation.org>
Date:   Tue,  1 Sep 2020 17:09:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sham Muthayyan <smuthayy@...eaurora.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 095/214] PCI: qcom: Add missing reset for ipq806x

From: Ansuel Smith <ansuelsmth@...il.com>

[ Upstream commit ee367e2cdd2202b5714982739e684543cd2cee0e ]

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@...eaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Reviewed-by: Rob Herring <robh@...nel.org>
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
Cc: stable@...r.kernel.org # v4.5+
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 9cf7599a198c4..374db5d59cf87 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -110,6 +110,7 @@ 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];
 };
 
@@ -279,6 +280,10 @@ 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);
 }
@@ -292,6 +297,7 @@ 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);
@@ -351,6 +357,12 @@ 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);
-- 
2.25.1