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Message-Id: <20250616-eusb2-repeater-tuning-v1-2-9457ff0fbf75@fairphone.com>
Date: Mon, 16 Jun 2025 11:45:12 +0200
From: Luca Weiss <luca.weiss@...rphone.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>, Abel Vesa <abel.vesa@...aro.org>,
Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 2/2] phy: qualcomm: phy-qcom-eusb2-repeater: Don't zero-out
registers
Zeroing out registers does not happen in the downstream kernel, and will
"tune" the repeater in surely unexpected ways since most registers don't
have a reset value of 0x0.
Stop doing that and instead just set the registers that are in the init
sequence (though long term I don't think there's actually PMIC-specific
init sequences, there's board specific tuning, but that's a story for
another day).
Fixes: 99a517a582fc ("phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs")
Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 63 +++++++++++++-------------
1 file changed, 32 insertions(+), 31 deletions(-)
diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 6bd1b3c75c779d2db2744703262e132cc439f76e..a246c897fedb2edfd376ac5fdc0423607f8c562b 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -61,8 +61,13 @@ enum eusb2_reg_layout {
LAYOUT_SIZE,
};
+struct eusb2_repeater_init_tbl_reg {
+ u8 reg;
+ u8 value;
+};
+
struct eusb2_repeater_cfg {
- const u32 *init_tbl;
+ const struct eusb2_repeater_init_tbl_reg *init_tbl;
int init_tbl_num;
const char * const *vreg_list;
int num_vregs;
@@ -82,16 +87,16 @@ static const char * const pm8550b_vreg_l[] = {
"vdd18", "vdd3",
};
-static const u32 pm8550b_init_tbl[NUM_TUNE_FIELDS] = {
- [TUNE_IUSB2] = 0x8,
- [TUNE_SQUELCH_U] = 0x3,
- [TUNE_USB2_PREEM] = 0x5,
+static const struct eusb2_repeater_init_tbl_reg pm8550b_init_tbl[] = {
+ { TUNE_IUSB2, 0x8 },
+ { TUNE_SQUELCH_U, 0x3 },
+ { TUNE_USB2_PREEM, 0x5 },
};
-static const u32 smb2360_init_tbl[NUM_TUNE_FIELDS] = {
- [TUNE_IUSB2] = 0x5,
- [TUNE_SQUELCH_U] = 0x3,
- [TUNE_USB2_PREEM] = 0x2,
+static const struct eusb2_repeater_init_tbl_reg smb2360_init_tbl[] = {
+ { TUNE_IUSB2, 0x5 },
+ { TUNE_SQUELCH_U, 0x3 },
+ { TUNE_USB2_PREEM, 0x2 },
};
static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
@@ -129,17 +134,10 @@ static int eusb2_repeater_init(struct phy *phy)
struct eusb2_repeater *rptr = phy_get_drvdata(phy);
struct device_node *np = rptr->dev->of_node;
struct regmap *regmap = rptr->regmap;
- const u32 *init_tbl = rptr->cfg->init_tbl;
- u8 tune_usb2_preem = init_tbl[TUNE_USB2_PREEM];
- u8 tune_hsdisc = init_tbl[TUNE_HSDISC];
- u8 tune_iusb2 = init_tbl[TUNE_IUSB2];
u32 base = rptr->base;
- u32 val;
+ u32 poll_val;
int ret;
-
- of_property_read_u8(np, "qcom,tune-usb2-amplitude", &tune_iusb2);
- of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &tune_hsdisc);
- of_property_read_u8(np, "qcom,tune-usb2-preem", &tune_usb2_preem);
+ u8 val;
ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
if (ret)
@@ -147,21 +145,24 @@ static int eusb2_repeater_init(struct phy *phy)
regmap_write(regmap, base + EUSB2_EN_CTL1, EUSB2_RPTR_EN);
- regmap_write(regmap, base + EUSB2_TUNE_EUSB_HS_COMP_CUR, init_tbl[TUNE_EUSB_HS_COMP_CUR]);
- regmap_write(regmap, base + EUSB2_TUNE_EUSB_EQU, init_tbl[TUNE_EUSB_EQU]);
- regmap_write(regmap, base + EUSB2_TUNE_EUSB_SLEW, init_tbl[TUNE_EUSB_SLEW]);
- regmap_write(regmap, base + EUSB2_TUNE_USB2_HS_COMP_CUR, init_tbl[TUNE_USB2_HS_COMP_CUR]);
- regmap_write(regmap, base + EUSB2_TUNE_USB2_EQU, init_tbl[TUNE_USB2_EQU]);
- regmap_write(regmap, base + EUSB2_TUNE_USB2_SLEW, init_tbl[TUNE_USB2_SLEW]);
- regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, init_tbl[TUNE_SQUELCH_U]);
- regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, init_tbl[TUNE_RES_FSDIF]);
- regmap_write(regmap, base + EUSB2_TUNE_USB2_CROSSOVER, init_tbl[TUNE_USB2_CROSSOVER]);
+ /* Write registers from init table */
+ for (int i = 0; i < rptr->cfg->init_tbl_num; i++)
+ regmap_write(regmap, base + rptr->cfg->init_tbl[i].reg,
+ rptr->cfg->init_tbl[i].value);
- regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, tune_usb2_preem);
- regmap_write(regmap, base + EUSB2_TUNE_HSDISC, tune_hsdisc);
- regmap_write(regmap, base + EUSB2_TUNE_IUSB2, tune_iusb2);
+ /* Override registers from devicetree values */
+ if (!of_property_read_u8(np, "qcom,tune-usb2-amplitude", &val))
+ regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, val);
- ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, val, val & RPTR_OK, 10, 5);
+ if (!of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &val))
+ regmap_write(regmap, base + EUSB2_TUNE_HSDISC, val);
+
+ if (!of_property_read_u8(np, "qcom,tune-usb2-preem", &val))
+ regmap_write(regmap, base + EUSB2_TUNE_IUSB2, val);
+
+ /* Wait for status OK */
+ ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, poll_val,
+ poll_val & RPTR_OK, 10, 5);
if (ret)
dev_err(rptr->dev, "initialization timed-out\n");
--
2.49.0
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