[PATCH 1/2] phy: cadence: salvo: Add usb2-disconnect-threshold-microvolt property

[PATCH 1/2] phy: cadence: salvo: Add usb2-disconnect-threshold-microvolt property

[Frank Li]

Add 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>
---
 arch/arm64/boot/dts/freescale/imx8x-mek.dtsi |  1 +
 drivers/phy/cadence/phy-cadence-salvo.c      | 30 +++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
index 2f8fe59fc131..6a396844c02d 100644
--- a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
@@ -1051,6 +1051,7 @@ &usbotg1 {
 
 &usb3_phy {
 	status = "okay";
+	usb2-disconnect-threshold-microvolt = <645>;
 };
 
 &usbotg3 {
diff --git a/drivers/phy/cadence/phy-cadence-salvo.c b/drivers/phy/cadence/phy-cadence-salvo.c
index 23be27a747a9..06e705dbbc3c 100644
--- a/drivers/phy/cadence/phy-cadence-salvo.c
+++ b/drivers/phy/cadence/phy-cadence-salvo.c
@@ -5,7 +5,7 @@
  *
  * Copyright (c) 2019-2020 NXP
  */
-
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/module.h>
@@ -91,9 +91,19 @@
 
 /* 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 +135,7 @@ 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 +272,12 @@ 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 +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);
@@ -326,6 +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, "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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[PATCH 2/2] doc: dt-binding: cdns-salvo-phy: add property usb2-disconnect-threshold-microvolt

[Frank Li]

Add 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>
---
 Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml b/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
index 3a07285b5470..3c7f5b3f9211 100644
--- a/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
@@ -31,6 +31,13 @@ properties:
   "#phy-cells":
     const: 0
 
+  usb2-disconnect-threshold-microvolt:
+    description: The microvolt threshold value utilized for detecting
+      USB disconnection event.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [575, 610, 645]
+    default: 575
+
 required:
   - compatible
   - reg
-- 
2.34.1


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Re: [PATCH 2/2] doc: dt-binding: cdns-salvo-phy: add property usb2-disconnect-threshold-microvolt

[Rob Herring]

On Fri, 05 May 2023 14:52:47 -0400, Frank Li wrote:
> Add 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>
> ---
>  Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml: properties:usb2-disconnect-threshold-microvolt: '$ref' should not be valid under {'const': '$ref'}
	hint: Standard unit suffix properties don't need a type $ref
	from schema $id: http://devicetree.org/meta-schemas/core.yaml#

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230505185247.1854677-2-Frank.Li@nxp.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.


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Re: [PATCH 2/2] doc: dt-binding: cdns-salvo-phy: add property usb2-disconnect-threshold-microvolt

[Krzysztof Kozlowski]

On 05/05/2023 20:52, Frank Li wrote:
> Add usb2-disconnect-threshold-microvolt property to address fake USB
> disconnection issue during enumeration or suspend state for difference
> platform.

Use subject prefixes matching the subsystem (which you can get for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching). Two prefixes got wrong... It's not doc but it
is dt-bindings.

> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>  Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml b/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
> index 3a07285b5470..3c7f5b3f9211 100644
> --- a/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/cdns,salvo-phy.yaml
> @@ -31,6 +31,13 @@ properties:
>    "#phy-cells":
>      const: 0
>  
> +  usb2-disconnect-threshold-microvolt:
> +    description: The microvolt threshold value utilized for detecting
> +      USB disconnection event.
> +    $ref: /schemas/types.yaml#/definitions/uint32

Does not look like you tested the bindings. Please run `make
dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

Drop ref. Add vendor prefix.

> +    enum: [575, 610, 645]
> +    default: 575
> +
>  required:
>    - compatible
>    - reg

Best regards,
Krzysztof


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Re: [PATCH 1/2] phy: cadence: salvo: Add usb2-disconnect-threshold-microvolt property

[Krzysztof Kozlowski]

On 05/05/2023 20:52, Frank Li wrote:
> Add 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>
> ---
>  arch/arm64/boot/dts/freescale/imx8x-mek.dtsi |  1 +
>  drivers/phy/cadence/phy-cadence-salvo.c      | 30 +++++++++++++++++++-

DTS and drivers are always separate.

Best regards,
Krzysztof


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Re: [PATCH 1/2] phy: cadence: salvo: Add usb2-disconnect-threshold-microvolt property

[Vinod Koul]

On 05-05-23, 14:52, Frank Li wrote:
> Add 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>
> ---
>  arch/arm64/boot/dts/freescale/imx8x-mek.dtsi |  1 +
>  drivers/phy/cadence/phy-cadence-salvo.c      | 30 +++++++++++++++++++-
>  2 files changed, 30 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> index 2f8fe59fc131..6a396844c02d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8x-mek.dtsi
> @@ -1051,6 +1051,7 @@ &usbotg1 {
>  
>  &usb3_phy {
>  	status = "okay";
> +	usb2-disconnect-threshold-microvolt = <645>;
>  };
>  
>  &usbotg3 {
> diff --git a/drivers/phy/cadence/phy-cadence-salvo.c b/drivers/phy/cadence/phy-cadence-salvo.c
> index 23be27a747a9..06e705dbbc3c 100644
> --- a/drivers/phy/cadence/phy-cadence-salvo.c
> +++ b/drivers/phy/cadence/phy-cadence-salvo.c
> @@ -5,7 +5,7 @@
>   *
>   * Copyright (c) 2019-2020 NXP
>   */
> -

why this change?

> +#include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/io.h>
>  #include <linux/module.h>
> @@ -91,9 +91,19 @@
>  
>  /* 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 +135,7 @@ 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 +272,12 @@ 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 +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);
> @@ -326,6 +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, "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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