linux-kernel - [PATCH v2 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

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Message-Id: <20251204044644.3072086-3-krishna.kurapati@oss.qualcomm.com>
Date: Thu,  4 Dec 2025 10:16:43 +0530
From: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
To: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Pengyu Luo <mitltlatltl@...il.com>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Krishna Kurapati <krishna.kurapati@....qualcomm.com>
Subject: [PATCH v2 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

Add support for overriding Squelch Detect parameter.

Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
---
 .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 651a12b59bc8..a75b37d4e16d 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 +160,15 @@ 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 < ARRAY_SIZE(squelch_detector); i++) {
+			if (squelch_detector[i] == dt_val) {
+				regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, i);
+				break;
+			}
+		}
+	}
+
 	/* 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