linux-kernel - Re: [PATCH v3 1/2] phy: cadence: salvo: Add cdns,usb2-disconnect-threshold-microvolt property

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Message-ID: <ZGOCT0Mdg3Jtar6c@matsya>
Date:   Tue, 16 May 2023 18:47:03 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     kishon@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        imx@...ts.linux.dev, fushi.peng@....com
Subject: Re: [PATCH v3 1/2] phy: cadence: salvo: Add
 cdns,usb2-disconnect-threshold-microvolt property

On 10-05-23, 10:05, Frank Li wrote:
> Add cdns,usb2-disconnect-threshold-microvolt property to address fake USB
> disconnection issue during enumeration or suspend state for difference
> platform.

This fails to apply for me on phy/next. What tree was this based on?

> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
> Change from v2 to v3
> - add cdns prefix
> Change from v1 to v2
> - remove empty change before #include 
> - Remove dts change from patch
> 
>  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 23be27a747a9..ab7eca515059 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[];
> @@ -261,6 +273,12 @@ static int cdns_salvo_phy_init(struct phy *phy)
>  
>  	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);
> @@ -315,6 +333,7 @@ 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);
> @@ -326,6 +345,16 @@ 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
> 
> 
> -- 
> linux-phy mailing list
> linux-phy@...ts.infradead.org
> https://lists.infradead.org/mailman/listinfo/linux-phy

-- 
~Vinod

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