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From: Frank Li <Frank.Li@nxp.com>
To: vkoul@kernel.org
Cc: Frank.Li@nxp.com, devicetree@vger.kernel.org, fushi.peng@nxp.com,
	imx@lists.linux.dev, kernel@pengutronix.de, kishon@kernel.org,
	krzysztof.kozlowski+dt@linaro.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org,
	robh+dt@kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org
Subject: [PATCH v5 5/6] phy: cadence: salvo: Add cdns,usb2-disconnect-threshold-microvolt property
Date: Wed, 17 May 2023 12:16:45 -0400	[thread overview]
Message-ID: <20230517161646.3418250-6-Frank.Li@nxp.com> (raw)
In-Reply-To: <20230517161646.3418250-1-Frank.Li@nxp.com>

Add cdns,usb2-disconnect-threshold-microvolt property to address fake USB
disconnection issue during enumeration or suspend state for difference
platform.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/phy/cadence/phy-cadence-salvo.c | 29 +++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/phy/cadence/phy-cadence-salvo.c b/drivers/phy/cadence/phy-cadence-salvo.c
index 083de7190819..f461585c84c6 100644
--- a/drivers/phy/cadence/phy-cadence-salvo.c
+++ b/drivers/phy/cadence/phy-cadence-salvo.c
@@ -6,6 +6,7 @@
  * Copyright (c) 2019-2020 NXP
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -91,9 +92,19 @@
 
 /* USB2 PHY register definition */
 #define UTMI_REG15				0xaf
+#define UTMI_AFE_RX_REG0			0x0d
 #define UTMI_AFE_RX_REG5			0x12
 #define UTMI_AFE_BC_REG4			0x29
 
+/* Align UTMI_AFE_RX_REG0 bit[7:6] define */
+enum usb2_disconn_threshold {
+	USB2_DISCONN_THRESHOLD_575 = 0x0,
+	USB2_DISCONN_THRESHOLD_610 = 0x1,
+	USB2_DISCONN_THRESHOLD_645 = 0x3,
+};
+
+#define RX_USB2_DISCONN_MASK			GENMASK(7, 6)
+
 /* TB_ADDR_TX_RCVDETSC_CTRL */
 #define RXDET_IN_P3_32KHZ			BIT(0)
 /*
@@ -125,6 +136,7 @@ struct cdns_salvo_phy {
 	struct clk *clk;
 	void __iomem *base;
 	struct cdns_salvo_data *data;
+	enum usb2_disconn_threshold usb2_disconn;
 };
 
 static const struct of_device_id cdns_salvo_phy_of_match[];
@@ -260,6 +272,12 @@ static int cdns_salvo_phy_init(struct phy *phy)
 			 value | TXVALID_GATE_THRESHOLD_HS_0US);
 
 	cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG5, 0x5);
+
+	value = cdns_salvo_read(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG0);
+	value &= ~RX_USB2_DISCONN_MASK;
+	value = FIELD_PREP(RX_USB2_DISCONN_MASK, salvo_phy->usb2_disconn);
+	cdns_salvo_write(salvo_phy, USB2_PHY_OFFSET, UTMI_AFE_RX_REG0, value);
+
 	udelay(10);
 
 	clk_disable_unprepare(salvo_phy->clk);
@@ -314,6 +332,7 @@ static int cdns_salvo_phy_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct cdns_salvo_phy *salvo_phy;
 	struct cdns_salvo_data *data;
+	u32 val;
 
 	data = (struct cdns_salvo_data *)of_device_get_match_data(dev);
 	salvo_phy = devm_kzalloc(dev, sizeof(*salvo_phy), GFP_KERNEL);
@@ -325,6 +344,16 @@ static int cdns_salvo_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(salvo_phy->clk))
 		return PTR_ERR(salvo_phy->clk);
 
+	if (of_property_read_u32(dev->of_node, "cdns,usb2-disconnect-threshold-microvolt", &val))
+		val = 575;
+
+	if (val < 610)
+		salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_575;
+	else if (val < 645)
+		salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_610;
+	else
+		salvo_phy->usb2_disconn = USB2_DISCONN_THRESHOLD_645;
+
 	salvo_phy->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(salvo_phy->base))
 		return PTR_ERR(salvo_phy->base);
-- 
2.34.1


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  parent reply	other threads:[~2023-05-17 16:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-17 16:16 [PATCH v5 0/6] phy: cadence: salvo: some fixes and workarounds Frank Li
2023-05-17 16:16 ` [PATCH v5 1/6] phy: cadence: salvo: add access for USB2PHY Frank Li
2023-05-17 16:16 ` [PATCH v5 2/6] phy: cadence: salvo: decrease delay value to zero for txvalid Frank Li
2023-05-17 16:16 ` [PATCH v5 3/6] phy: cadence: salvo: add bist fix Frank Li
2023-05-17 16:16 ` [PATCH v5 4/6] phy: cadence: salvo: add .set_mode API Frank Li
2023-05-17 16:16 ` Frank Li [this message]
2023-05-17 16:16 ` [PATCH v5 6/6] dt-bindings: phy: cdns,salvo: add property cdns,usb2-disconnect-threshold-microvolt Frank Li
2023-05-19 17:44 ` [PATCH v5 0/6] phy: cadence: salvo: some fixes and workarounds Vinod Koul

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