linux-kernel - [PATCH 5.8 079/255] PCI: qcom: Add missing ipq806x clocks in PCIe driver

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Date:   Tue,  1 Sep 2020 17:08:55 +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>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 079/255] PCI: qcom: Add missing ipq806x clocks in PCIe driver

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

[ Upstream commit 8b6f0330b5f9a7543356bfa9e76d580f03aa2c1e ]

Aux and Ref clk are missing in PCIe qcom driver. Add support for this
optional clks for ipq8064/apq8064 SoC.

Link: https://lore.kernel.org/r/20200615210608.21469-2-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>
Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 38 ++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 5dd1740855770..aa25a3040f7cc 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -106,6 +106,8 @@ struct qcom_pcie_resources_2_1_0 {
 	struct clk *iface_clk;
 	struct clk *core_clk;
 	struct clk *phy_clk;
+	struct clk *aux_clk;
+	struct clk *ref_clk;
 	struct reset_control *pci_reset;
 	struct reset_control *axi_reset;
 	struct reset_control *ahb_reset;
@@ -264,6 +266,14 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 	if (IS_ERR(res->phy_clk))
 		return PTR_ERR(res->phy_clk);
 
+	res->aux_clk = devm_clk_get_optional(dev, "aux");
+	if (IS_ERR(res->aux_clk))
+		return PTR_ERR(res->aux_clk);
+
+	res->ref_clk = devm_clk_get_optional(dev, "ref");
+	if (IS_ERR(res->ref_clk))
+		return PTR_ERR(res->ref_clk);
+
 	res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
 	if (IS_ERR(res->pci_reset))
 		return PTR_ERR(res->pci_reset);
@@ -296,6 +306,8 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
 	clk_disable_unprepare(res->iface_clk);
 	clk_disable_unprepare(res->core_clk);
 	clk_disable_unprepare(res->phy_clk);
+	clk_disable_unprepare(res->aux_clk);
+	clk_disable_unprepare(res->ref_clk);
 	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
 }
 
@@ -326,16 +338,28 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 		goto err_assert_ahb;
 	}
 
+	ret = clk_prepare_enable(res->core_clk);
+	if (ret) {
+		dev_err(dev, "cannot prepare/enable core clock\n");
+		goto err_clk_core;
+	}
+
 	ret = clk_prepare_enable(res->phy_clk);
 	if (ret) {
 		dev_err(dev, "cannot prepare/enable phy clock\n");
 		goto err_clk_phy;
 	}
 
-	ret = clk_prepare_enable(res->core_clk);
+	ret = clk_prepare_enable(res->aux_clk);
 	if (ret) {
-		dev_err(dev, "cannot prepare/enable core clock\n");
-		goto err_clk_core;
+		dev_err(dev, "cannot prepare/enable aux clock\n");
+		goto err_clk_aux;
+	}
+
+	ret = clk_prepare_enable(res->ref_clk);
+	if (ret) {
+		dev_err(dev, "cannot prepare/enable ref clock\n");
+		goto err_clk_ref;
 	}
 
 	ret = reset_control_deassert(res->ahb_reset);
@@ -411,10 +435,14 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 	return 0;
 
 err_deassert_ahb:
-	clk_disable_unprepare(res->core_clk);
-err_clk_core:
+	clk_disable_unprepare(res->ref_clk);
+err_clk_ref:
+	clk_disable_unprepare(res->aux_clk);
+err_clk_aux:
 	clk_disable_unprepare(res->phy_clk);
 err_clk_phy:
+	clk_disable_unprepare(res->core_clk);
+err_clk_core:
 	clk_disable_unprepare(res->iface_clk);
 err_assert_ahb:
 	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
-- 
2.25.1