linux-kernel - [PATCH v2 08/10] PCIe: qcom: add ipq8064 rev2 variant and set tx term offset

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Date:   Thu,  2 Apr 2020 14:11:45 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andy Gross <agross@...nel.org>
Cc:     Sham Muthayyan <smuthayy@...eaurora.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 08/10] PCIe: qcom: add ipq8064 rev2 variant and set tx term offset

From: Sham Muthayyan <smuthayy@...eaurora.org>

Add tx term offset support to pcie qcom driver need in some revision of
the ipq806x SoC.
Ipq8064 have tx term offset set to 7.
Ipq8064 v2 revision and ipq8065 have the tx term offset set to 0.

Signed-off-by: Sham Muthayyan <smuthayy@...eaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 77b1ab7e23a3..8047ac7dc8c7 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -45,6 +45,9 @@
 #define PCIE_CAP_CPL_TIMEOUT_DISABLE		0x10
 
 #define PCIE20_PARF_PHY_CTRL			0x40
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(12, 16)
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)	(x << 16)
+
 #define PCIE20_PARF_PHY_REFCLK			0x4C
 #define REF_SSP_EN				BIT(16)
 #define REF_USE_PAD				BIT(12)
@@ -112,6 +115,7 @@ struct qcom_pcie_resources_2_1_0 {
 	struct reset_control *phy_reset;
 	struct reset_control *ext_reset;
 	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
+	uint8_t phy_tx0_term_offset;
 };
 
 struct qcom_pcie_resources_1_0_0 {
@@ -302,6 +306,11 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 	if (IS_ERR(res->ext_reset))
 		return PTR_ERR(res->ext_reset);
 
+	if (of_device_is_compatible(dev->of_node, "qcom,pcie-ipq8064"))
+		res->phy_tx0_term_offset = 7;
+	else
+		res->phy_tx0_term_offset = 0;
+
 	res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
 	return PTR_ERR_OR_ZERO(res->phy_reset);
 }
@@ -381,6 +390,11 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 
 	qcom_clear_and_set_dword(pcie->parf + PCIE20_PARF_PHY_CTRL, BIT(0), 0);
 
+	/* set TX termination offset */
+	qcom_clear_and_set_dword(pcie->parf + PCIE20_PARF_PHY_CTRL,
+			PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK,
+			PHY_CTRL_PHY_TX0_TERM_OFFSET(res->phy_tx0_term_offset));
+
 	/* PARF programming */
 	writel(PCS_DEEMPH_TX_DEEMPH_GEN1(0x18) |
 	       PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(0x18) |
@@ -1494,6 +1508,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
 	{ .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 },
+	{ .compatible = "qcom,pcie-ipq8064-v2", .data = &ops_2_1_0 },
 	{ .compatible = "qcom,pcie-apq8064", .data = &ops_2_1_0 },
 	{ .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
 	{ .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
-- 
2.25.1