[PATCH 0/3] Add eusb2 repeater squelch detect parameter override

[PATCH 0/3] Add eusb2 repeater squelch detect parameter override

[Krishna Kurapati]

Add support for eusb2 repeater squelch detect parameter override via DT.

Squelch detect parameter adjusts the voltage level for the threshold used
to detect valid high-speed data.

Krishna Kurapati (3):
  dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update
  phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param
    update
  arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters

 .../phy/qcom,snps-eusb2-repeater.yaml         |  7 +++++++
 arch/arm64/boot/dts/qcom/sm8750-mtp.dts       |  4 ++++
 .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 21 +++++++++++++++++++
 3 files changed, 32 insertions(+)

-- 
2.34.1

[PATCH 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Krishna Kurapati]

Add squelch detect parameter update for synopsys eusb2 repeater.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
---
 .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml  | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
index 5bf0d6c9c025..8a9251ba3b54 100644
--- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
@@ -59,6 +59,13 @@ properties:
     minimum: 0
     maximum: 7
 
+  qcom,squelch-detector-bp:
+    description:
+      This adjusts the voltage level for the threshold used to detect valid
+      high-speed data.
+    minimum: -6000
+    maximum: 1000
+
 required:
   - compatible
   - reg
-- 
2.34.1

Re: [PATCH 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Konrad Dybcio]

On 12/3/25 9:36 AM, Krishna Kurapati wrote:
> Add squelch detect parameter update for synopsys eusb2 repeater.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> ---
>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml  | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> index 5bf0d6c9c025..8a9251ba3b54 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> @@ -59,6 +59,13 @@ properties:
>      minimum: 0
>      maximum: 7
>  
> +  qcom,squelch-detector-bp:
> +    description:
> +      This adjusts the voltage level for the threshold used to detect valid
> +      high-speed data.
> +    minimum: -6000
> +    maximum: 1000

multipleOf: 1000

Konrad

[PATCH 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Krishna Kurapati]

Add support for overriding Squelch Detect parameter.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
---
 .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 651a12b59bc8..e5812626a871 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -37,6 +37,17 @@
 #define EUSB2_TUNE_EUSB_EQU		0x5A
 #define EUSB2_TUNE_EUSB_HS_COMP_CUR	0x5B
 
+static const int squelch_detector[] = {
+	[0] = -6000,
+	[1] = -5000,
+	[2] = -4000,
+	[3] = -3000,
+	[4] = -2000,
+	[5] = -1000,
+	[6] = 0,
+	[7] = 1000,
+};
+
 struct eusb2_repeater_init_tbl_reg {
 	unsigned int reg;
 	unsigned int value;
@@ -120,7 +131,9 @@ static int eusb2_repeater_init(struct phy *phy)
 	struct regmap *regmap = rptr->regmap;
 	u32 base = rptr->base;
 	u32 poll_val;
+	s32 dt_val;
 	int ret;
+	int i;
 	u8 val;
 
 	ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
@@ -147,6 +160,14 @@ static int eusb2_repeater_init(struct phy *phy)
 	if (!of_property_read_u8(np, "qcom,tune-res-fsdif", &val))
 		regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, val);
 
+	if (!of_property_read_s32(np, "qcom,squelch-detector-bp", &dt_val)) {
+		for (i = 0; i < 8; i++) {
+			if (squelch_detector[i] == dt_val)
+				val = i;
+		}
+		regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, val);
+	}
+
 	/* Wait for status OK */
 	ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, poll_val,
 				       poll_val & RPTR_OK, 10, 5);
-- 
2.34.1

Re: [PATCH 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Konrad Dybcio]

On 12/3/25 9:36 AM, Krishna Kurapati wrote:
> Add support for overriding Squelch Detect parameter.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> ---

[...]

>  struct eusb2_repeater_init_tbl_reg {
>  	unsigned int reg;
>  	unsigned int value;
> @@ -120,7 +131,9 @@ static int eusb2_repeater_init(struct phy *phy)
>  	struct regmap *regmap = rptr->regmap;
>  	u32 base = rptr->base;
>  	u32 poll_val;
> +	s32 dt_val;
>  	int ret;
> +	int i;
>  	u8 val;
>  
>  	ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
> @@ -147,6 +160,14 @@ static int eusb2_repeater_init(struct phy *phy)
>  	if (!of_property_read_u8(np, "qcom,tune-res-fsdif", &val))
>  		regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, val);
>  
> +	if (!of_property_read_s32(np, "qcom,squelch-detector-bp", &dt_val)) {
> +		for (i = 0; i < 8; i++) {
> +			if (squelch_detector[i] == dt_val)
> +				val = i;
> +		}
> +		regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, val);


How about:

if (!of_property..) {
	for (i = 0; i < ARRAY_SIZE(squelch_detector); i++) {
		if (squelch_detector[i] == dt_val) {
			regmap_write()
			break;
		}
	}
}

We could also validate the value (if none found but property present, error
out), but the dt checker already lists all the available values so that may
not be necessary

Konrad

Re: [PATCH 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Krishna Kurapati PSSNV]

On 12/3/2025 4:45 PM, Konrad Dybcio wrote:
> On 12/3/25 9:36 AM, Krishna Kurapati wrote:
>> Add support for overriding Squelch Detect parameter.
>>
>> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
>> ---
> 
> [...]
> 
>>   struct eusb2_repeater_init_tbl_reg {
>>   	unsigned int reg;
>>   	unsigned int value;
>> @@ -120,7 +131,9 @@ static int eusb2_repeater_init(struct phy *phy)
>>   	struct regmap *regmap = rptr->regmap;
>>   	u32 base = rptr->base;
>>   	u32 poll_val;
>> +	s32 dt_val;
>>   	int ret;
>> +	int i;
>>   	u8 val;
>>   
>>   	ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
>> @@ -147,6 +160,14 @@ static int eusb2_repeater_init(struct phy *phy)
>>   	if (!of_property_read_u8(np, "qcom,tune-res-fsdif", &val))
>>   		regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, val);
>>   
>> +	if (!of_property_read_s32(np, "qcom,squelch-detector-bp", &dt_val)) {
>> +		for (i = 0; i < 8; i++) {
>> +			if (squelch_detector[i] == dt_val)
>> +				val = i;
>> +		}
>> +		regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, val);
> 
> 
> How about:
> 
> if (!of_property..) {
> 	for (i = 0; i < ARRAY_SIZE(squelch_detector); i++) {
> 		if (squelch_detector[i] == dt_val) {
> 			regmap_write()
> 			break;
> 		}
> 	}
> }
> 
> We could also validate the value (if none found but property present, error
> out), but the dt checker already lists all the available values so that may
> not be necessary
> 

Thanks for the review Konrad.

Will make changes accordingly.

Regards,
Krishna,

[PATCH 3/3] arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters

[Krishna Kurapati]

Add eusb2 repeater tuning parameters for MTP platform.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
index c8cb521b4c26..b9a4d1c99816 100644
--- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
@@ -1041,6 +1041,10 @@ wifi@0 {
 &pmih0108_eusb2_repeater {
 	status = "okay";
 
+	qcom,tune-usb2-preem = /bits/ 8 <0x3>;
+	qcom,tune-usb2-amplitude = /bits/ 8 <0xa>;
+	qcom,squelch-detector-bp = <(-2000)>;
+
 	vdd18-supply = <&vreg_l15b_1p8>;
 	vdd3-supply = <&vreg_l5b_3p1>;
 };
-- 
2.34.1