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phy: cadence: salvo: Add cdns,usb2-disconnect-threshold-microvolt property

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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>
Link: https://lore.kernel.org/r/20230517161646.3418250-6-Frank.Li@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Frank Li 2023-05-17 12:16:45 -04:00 committed by Vinod Koul
parent 3ad5cebe9c
commit e8c3336134
1 changed files with 29 additions and 0 deletions
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29
drivers/phy/cadence/phy-cadence-salvo.c
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@ -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);