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Message-ID: <20200609114148.GS311@earth.li>
Date: Tue, 9 Jun 2020 12:41:48 +0100
From: Jonathan McDowell <noodles@...th.li>
To: ansuelsmth@...il.com
Cc: 'Bjorn Andersson' <bjorn.andersson@...aro.org>,
'Andy Gross' <agross@...eaurora.org>,
'Andy Gross' <agross@...nel.org>,
'Kishon Vijay Abraham I' <kishon@...com>,
'Rob Herring' <robh+dt@...nel.org>,
'Mark Rutland' <mark.rutland@....com>,
Vinod Koul <vkoul@...nel.org>, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: R: [PATCH v6 1/2] phy: qualcomm: add qcom ipq806x dwc usb phy
driver
On Fri, Jun 05, 2020 at 07:00:04PM +0200, ansuelsmth@...il.com wrote:
> > On Wed, Jun 03, 2020 at 03:22:34PM +0200, Ansuel Smith wrote:
> > > This has lost in the original push for the dwc3 qcom driver.
> > > This is needed for ipq806x SoC as without this the usb ports
> > > doesn't work at all.
> >
> > FWIW I tested this on my RB3011 so feel free to add:
> >
> > Tested-by: Jonathan McDowell <noodles@...th.li>
> >
> > One minor comment; would PHY_QCOM_USB_IPQ806X not be a better
> > choice than PHY_QCOM_IPQ806X_USB given the existing naming?
> >
>
> Thanks for the feedback. About naming I'm following the sata ipq806x
> naming. I really hope someone gets this and reviews it since usb is
> broken for a long time now.
Doesn't seem to have made the 5.8 merge window; I note Vinod has done a
bunch of the recent commits to phy/qualcomm/ so adding him to the CC in
addition to Kishon.
> > > Signed-off-by: Andy Gross <agross@...eaurora.org>
> > > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > > ---
> > > v6:
> > > * Use GENMASK instead of hex value
> > > v4:
> > > * Add qcom to specific bindings
> > > v3:
> > > * Use reg instead of regmap phandle
> > > v2:
> > > * Renamed config from PHY_QCOM_DWC3 to PHY_QCOM_IPQ806X_USB
> > > * Rename inline function to generic name to reduce length
> > > * Fix check reported by checkpatch --strict
> > > * Rename compatible to qcom,ipq806x-usb-phy-(hs/ss)
> > >
> > > drivers/phy/qualcomm/Kconfig | 12 +
> > > drivers/phy/qualcomm/Makefile | 1 +
> > > drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c | 593
> > ++++++++++++++++++++
> > > 3 files changed, 606 insertions(+)
> > > create mode 100644 drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> > >
> > > diff --git a/drivers/phy/qualcomm/Kconfig
> > b/drivers/phy/qualcomm/Kconfig
> > > index e46824da29f6..9d41c3d12800 100644
> > > --- a/drivers/phy/qualcomm/Kconfig
> > > +++ b/drivers/phy/qualcomm/Kconfig
> > > @@ -91,3 +91,15 @@ config PHY_QCOM_USB_HSIC
> > > select GENERIC_PHY
> > > help
> > > Support for the USB HSIC ULPI compliant PHY on QCOM chipsets.
> > > +
> > > +config PHY_QCOM_IPQ806X_USB
> > > + tristate "Qualcomm IPQ806x DWC3 USB PHY driver"
> > > + depends on ARCH_QCOM
> > > + depends on HAS_IOMEM
> > > + depends on OF
> > > + select GENERIC_PHY
> > > + help
> > > + This option enables support for the Synopsis PHYs present inside
> > the
> > > + Qualcomm USB3.0 DWC3 controller on ipq806x SoC. This driver
> > supports
> > > + both HS and SS PHY controllers.
> > > +
> > > diff --git a/drivers/phy/qualcomm/Makefile
> > b/drivers/phy/qualcomm/Makefile
> > > index 283251d6a5d9..8629299c1495 100644
> > > --- a/drivers/phy/qualcomm/Makefile
> > > +++ b/drivers/phy/qualcomm/Makefile
> > > @@ -10,3 +10,4 @@ obj-$(CONFIG_PHY_QCOM_UFS_14NM)
> > += phy-qcom-ufs-qmp-14nm.o
> > > obj-$(CONFIG_PHY_QCOM_UFS_20NM) += phy-qcom-ufs-
> > qmp-20nm.o
> > > obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o
> > > obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o
> > > +obj-$(CONFIG_PHY_QCOM_IPQ806X_USB) += phy-qcom-
> > ipq806x-usb.o
> > > diff --git a/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> > b/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> > > new file mode 100644
> > > index 000000000000..f37cd8760118
> > > --- /dev/null
> > > +++ b/drivers/phy/qualcomm/phy-qcom-ipq806x-usb.c
> > > @@ -0,0 +1,593 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/* Copyright (c) 2014-2015, Code Aurora Forum. All rights reserved.
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License version 2 and
> > > + * only version 2 as published by the Free Software Foundation.
> > > + *
> > > + * This program is distributed in the hope that it will be useful,
> > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > > + * GNU General Public License for more details.
> > > + */
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/err.h>
> > > +#include <linux/io.h>
> > > +#include <linux/module.h>
> > > +#include <linux/of.h>
> > > +#include <linux/phy/phy.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/mfd/syscon.h>
> > > +
> > > +/* USB QSCRATCH Hardware registers */
> > > +#define QSCRATCH_GENERAL_CFG (0x08)
> > > +#define HSUSB_PHY_CTRL_REG (0x10)
> > > +
> > > +/* PHY_CTRL_REG */
> > > +#define HSUSB_CTRL_DMSEHV_CLAMP BIT(24)
> > > +#define HSUSB_CTRL_USB2_SUSPEND BIT(23)
> > > +#define HSUSB_CTRL_UTMI_CLK_EN BIT(21)
> > > +#define HSUSB_CTRL_UTMI_OTG_VBUS_VALID BIT(20)
> > > +#define HSUSB_CTRL_USE_CLKCORE BIT(18)
> > > +#define HSUSB_CTRL_DPSEHV_CLAMP BIT(17)
> > > +#define HSUSB_CTRL_COMMONONN BIT(11)
> > > +#define HSUSB_CTRL_ID_HV_CLAMP BIT(9)
> > > +#define HSUSB_CTRL_OTGSESSVLD_CLAMP BIT(8)
> > > +#define HSUSB_CTRL_CLAMP_EN BIT(7)
> > > +#define HSUSB_CTRL_RETENABLEN BIT(1)
> > > +#define HSUSB_CTRL_POR BIT(0)
> > > +
> > > +/* QSCRATCH_GENERAL_CFG */
> > > +#define HSUSB_GCFG_XHCI_REV BIT(2)
> > > +
> > > +/* USB QSCRATCH Hardware registers */
> > > +#define SSUSB_PHY_CTRL_REG (0x00)
> > > +#define SSUSB_PHY_PARAM_CTRL_1 (0x04)
> > > +#define SSUSB_PHY_PARAM_CTRL_2 (0x08)
> > > +#define CR_PROTOCOL_DATA_IN_REG (0x0c)
> > > +#define CR_PROTOCOL_DATA_OUT_REG (0x10)
> > > +#define CR_PROTOCOL_CAP_ADDR_REG (0x14)
> > > +#define CR_PROTOCOL_CAP_DATA_REG (0x18)
> > > +#define CR_PROTOCOL_READ_REG (0x1c)
> > > +#define CR_PROTOCOL_WRITE_REG (0x20)
> > > +
> > > +/* PHY_CTRL_REG */
> > > +#define SSUSB_CTRL_REF_USE_PAD BIT(28)
> > > +#define SSUSB_CTRL_TEST_POWERDOWN BIT(27)
> > > +#define SSUSB_CTRL_LANE0_PWR_PRESENT BIT(24)
> > > +#define SSUSB_CTRL_SS_PHY_EN BIT(8)
> > > +#define SSUSB_CTRL_SS_PHY_RESET BIT(7)
> > > +
> > > +/* SSPHY control registers - Does this need 0x30? */
> > > +#define SSPHY_CTRL_RX_OVRD_IN_HI(lane) (0x1006 + 0x100 *
> > (lane))
> > > +#define SSPHY_CTRL_TX_OVRD_DRV_LO(lane) (0x1002 + 0x100 *
> > (lane))
> > > +
> > > +/* SSPHY SoC version specific values */
> > > +#define SSPHY_RX_EQ_VALUE 4 /* Override value for rx_eq
> > */
> > > +/* Override value for transmit preemphasis */
> > > +#define SSPHY_TX_DEEMPH_3_5DB 23
> > > +/* Override value for mpll */
> > > +#define SSPHY_MPLL_VALUE 0
> > > +
> > > +/* QSCRATCH PHY_PARAM_CTRL1 fields */
> > > +#define PHY_PARAM_CTRL1_TX_FULL_SWING_MASK GENMASK(26,
> > 19)
> > > +#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK GENMASK(19,
> > 13)
> > > +#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK GENMASK(13,
> > 7)
> > > +#define PHY_PARAM_CTRL1_LOS_BIAS_MASK GENMASK(7,
> > 2)
> > > +
> > > +#define PHY_PARAM_CTRL1_MASK \
> > > + (PHY_PARAM_CTRL1_TX_FULL_SWING_MASK | \
> > > + PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK | \
> > > + PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK | \
> > > + PHY_PARAM_CTRL1_LOS_BIAS_MASK)
> > > +
> > > +#define PHY_PARAM_CTRL1_TX_FULL_SWING(x) \
> > > + (((x) << 20) & PHY_PARAM_CTRL1_TX_FULL_SWING_MASK)
> > > +#define PHY_PARAM_CTRL1_TX_DEEMPH_6DB(x) \
> > > + (((x) << 14) &
> > PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK)
> > > +#define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(x) \
> > > + (((x) << 8) &
> > PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK)
> > > +#define PHY_PARAM_CTRL1_LOS_BIAS(x) \
> > > + (((x) << 3) & PHY_PARAM_CTRL1_LOS_BIAS_MASK)
> > > +
> > > +/* RX OVRD IN HI bits */
> > > +#define RX_OVRD_IN_HI_RX_RESET_OVRD BIT(13)
> > > +#define RX_OVRD_IN_HI_RX_RX_RESET BIT(12)
> > > +#define RX_OVRD_IN_HI_RX_EQ_OVRD BIT(11)
> > > +#define RX_OVRD_IN_HI_RX_EQ_MASK GENMASK(10, 7)
> > > +#define RX_OVRD_IN_HI_RX_EQ(x) ((x) << 8)
> > > +#define RX_OVRD_IN_HI_RX_EQ_EN_OVRD BIT(7)
> > > +#define RX_OVRD_IN_HI_RX_EQ_EN BIT(6)
> > > +#define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD BIT(5)
> > > +#define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK GENMASK(4, 2)
> > > +#define RX_OVRD_IN_HI_RX_RATE_OVRD BIT(2)
> > > +#define RX_OVRD_IN_HI_RX_RATE_MASK GENMASK(2, 0)
> > > +
> > > +/* TX OVRD DRV LO register bits */
> > > +#define TX_OVRD_DRV_LO_AMPLITUDE_MASK GENMASK(6,
> > 0)
> > > +#define TX_OVRD_DRV_LO_PREEMPH_MASK GENMASK(13,
> > 6)
> > > +#define TX_OVRD_DRV_LO_PREEMPH(x) ((x) << 7)
> > > +#define TX_OVRD_DRV_LO_EN BIT(14)
> > > +
> > > +/* MPLL bits */
> > > +#define SSPHY_MPLL_MASK GENMASK(8,
> > 5)
> > > +#define SSPHY_MPLL(x) ((x) << 5)
> > > +
> > > +/* SS CAP register bits */
> > > +#define SS_CR_CAP_ADDR_REG BIT(0)
> > > +#define SS_CR_CAP_DATA_REG BIT(0)
> > > +#define SS_CR_READ_REG BIT(0)
> > > +#define SS_CR_WRITE_REG BIT(0)
> > > +
> > > +struct usb_phy {
> > > + void __iomem *base;
> > > + struct device *dev;
> > > + struct clk *xo_clk;
> > > + struct clk *ref_clk;
> > > + u32 rx_eq;
> > > + u32 tx_deamp_3_5db;
> > > + u32 mpll;
> > > +};
> > > +
> > > +struct phy_drvdata {
> > > + struct phy_ops ops;
> > > + u32 clk_rate;
> > > +};
> > > +
> > > +/**
> > > + * Write register and read back masked value to confirm it is written
> > > + *
> > > + * @base - QCOM DWC3 PHY base virtual address.
> > > + * @offset - register offset.
> > > + * @mask - register bitmask specifying what should be updated
> > > + * @val - value to write.
> > > + */
> > > +static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
> > > + u32 offset,
> > > + const u32 mask, u32 val)
> > > +{
> > > + u32 write_val, tmp = readl(phy_dwc3->base + offset);
> > > +
> > > + tmp &= ~mask; /* retain other bits */
> > > + write_val = tmp | val;
> > > +
> > > + writel(write_val, phy_dwc3->base + offset);
> > > +
> > > + /* Read back to see if val was written */
> > > + tmp = readl(phy_dwc3->base + offset);
> > > + tmp &= mask; /* clear other bits */
> > > +
> > > + if (tmp != val)
> > > + dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x
> > FAILED\n",
> > > + val, offset);
> > > +}
> > > +
> > > +static int wait_for_latch(void __iomem *addr)
> > > +{
> > > + u32 retry = 10;
> > > +
> > > + while (true) {
> > > + if (!readl(addr))
> > > + break;
> > > +
> > > + if (--retry == 0)
> > > + return -ETIMEDOUT;
> > > +
> > > + usleep_range(10, 20);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +/**
> > > + * Write SSPHY register
> > > + *
> > > + * @base - QCOM DWC3 PHY base virtual address.
> > > + * @addr - SSPHY address to write.
> > > + * @val - value to write.
> > > + */
> > > +static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
> > > + u32 addr, u32 val)
> > > +{
> > > + int ret;
> > > +
> > > + writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> > > + writel(SS_CR_CAP_ADDR_REG,
> > > + phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base +
> > CR_PROTOCOL_CAP_ADDR_REG);
> > > + if (ret)
> > > + goto err_wait;
> > > +
> > > + writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> > > + writel(SS_CR_CAP_DATA_REG,
> > > + phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base +
> > CR_PROTOCOL_CAP_DATA_REG);
> > > + if (ret)
> > > + goto err_wait;
> > > +
> > > + writel(SS_CR_WRITE_REG, phy_dwc3->base +
> > CR_PROTOCOL_WRITE_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base +
> > CR_PROTOCOL_WRITE_REG);
> > > +
> > > +err_wait:
> > > + if (ret)
> > > + dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
> > > + return ret;
> > > +}
> > > +
> > > +/**
> > > + * Read SSPHY register.
> > > + *
> > > + * @base - QCOM DWC3 PHY base virtual address.
> > > + * @addr - SSPHY address to read.
> > > + */
> > > +static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
> > > + u32 addr, u32 *val)
> > > +{
> > > + int ret;
> > > +
> > > + writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
> > > + writel(SS_CR_CAP_ADDR_REG,
> > > + phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base +
> > CR_PROTOCOL_CAP_ADDR_REG);
> > > + if (ret)
> > > + goto err_wait;
> > > +
> > > + /*
> > > + * Due to hardware bug, first read of SSPHY register might be
> > > + * incorrect. Hence as workaround, SW should perform SSPHY
> > register
> > > + * read twice, but use only second read and ignore first read.
> > > + */
> > > + writel(SS_CR_READ_REG, phy_dwc3->base +
> > CR_PROTOCOL_READ_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
> > > + if (ret)
> > > + goto err_wait;
> > > +
> > > + /* throwaway read */
> > > + readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
> > > +
> > > + writel(SS_CR_READ_REG, phy_dwc3->base +
> > CR_PROTOCOL_READ_REG);
> > > +
> > > + ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
> > > + if (ret)
> > > + goto err_wait;
> > > +
> > > + *val = readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
> > > +
> > > +err_wait:
> > > + return ret;
> > > +}
> > > +
> > > +static int qcom_ipq806x_usb_hs_phy_init(struct phy *phy)
> > > +{
> > > + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> > > + int ret;
> > > + u32 val;
> > > +
> > > + ret = clk_prepare_enable(phy_dwc3->xo_clk);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = clk_prepare_enable(phy_dwc3->ref_clk);
> > > + if (ret) {
> > > + clk_disable_unprepare(phy_dwc3->xo_clk);
> > > + return ret;
> > > + }
> > > +
> > > + /*
> > > + * HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
> > > + * enable clamping, and disable RETENTION (power-on default is
> > ENABLED)
> > > + */
> > > + val = HSUSB_CTRL_DPSEHV_CLAMP |
> > HSUSB_CTRL_DMSEHV_CLAMP |
> > > + HSUSB_CTRL_RETENABLEN | HSUSB_CTRL_COMMONONN |
> > > + HSUSB_CTRL_OTGSESSVLD_CLAMP |
> > HSUSB_CTRL_ID_HV_CLAMP |
> > > + HSUSB_CTRL_DPSEHV_CLAMP |
> > HSUSB_CTRL_UTMI_OTG_VBUS_VALID |
> > > + HSUSB_CTRL_UTMI_CLK_EN | HSUSB_CTRL_CLAMP_EN |
> > 0x70;
> > > +
> > > + /* use core clock if external reference is not present */
> > > + if (!phy_dwc3->xo_clk)
> > > + val |= HSUSB_CTRL_USE_CLKCORE;
> > > +
> > > + writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
> > > + usleep_range(2000, 2200);
> > > +
> > > + /* Disable (bypass) VBUS and ID filters */
> > > + writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base +
> > QSCRATCH_GENERAL_CFG);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int qcom_ipq806x_usb_hs_phy_exit(struct phy *phy)
> > > +{
> > > + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> > > +
> > > + clk_disable_unprepare(phy_dwc3->ref_clk);
> > > + clk_disable_unprepare(phy_dwc3->xo_clk);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int qcom_ipq806x_usb_ss_phy_init(struct phy *phy)
> > > +{
> > > + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> > > + int ret;
> > > + u32 data = 0;
> > > +
> > > + ret = clk_prepare_enable(phy_dwc3->xo_clk);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = clk_prepare_enable(phy_dwc3->ref_clk);
> > > + if (ret) {
> > > + clk_disable_unprepare(phy_dwc3->xo_clk);
> > > + return ret;
> > > + }
> > > +
> > > + /* reset phy */
> > > + data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > > + writel(data | SSUSB_CTRL_SS_PHY_RESET,
> > > + phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > > + usleep_range(2000, 2200);
> > > + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > > +
> > > + /* clear REF_PAD if we don't have XO clk */
> > > + if (!phy_dwc3->xo_clk)
> > > + data &= ~SSUSB_CTRL_REF_USE_PAD;
> > > + else
> > > + data |= SSUSB_CTRL_REF_USE_PAD;
> > > +
> > > + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > > +
> > > + /* wait for ref clk to become stable, this can take up to 30ms */
> > > + msleep(30);
> > > +
> > > + data |= SSUSB_CTRL_SS_PHY_EN |
> > SSUSB_CTRL_LANE0_PWR_PRESENT;
> > > + writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
> > > +
> > > + /*
> > > + * WORKAROUND: There is SSPHY suspend bug due to which USB
> > enumerates
> > > + * in HS mode instead of SS mode. Workaround it by asserting
> > > + * LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus
> > mode
> > > + */
> > > + ret = usb_ss_read_phycreg(phy_dwc3, 0x102D, &data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + data |= (1 << 7);
> > > + ret = usb_ss_write_phycreg(phy_dwc3, 0x102D, data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + ret = usb_ss_read_phycreg(phy_dwc3, 0x1010, &data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + data &= ~0xff0;
> > > + data |= 0x20;
> > > + ret = usb_ss_write_phycreg(phy_dwc3, 0x1010, data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + /*
> > > + * Fix RX Equalization setting as follows
> > > + * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
> > > + * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
> > > + * LANE0.RX_OVRD_IN_HI.RX_EQ set based on SoC version
> > > + * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
> > > + */
> > > + ret = usb_ss_read_phycreg(phy_dwc3,
> > > + SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
> > > + data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
> > > + data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
> > > + data |= RX_OVRD_IN_HI_RX_EQ(phy_dwc3->rx_eq);
> > > + data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
> > > + ret = usb_ss_write_phycreg(phy_dwc3,
> > > + SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + /*
> > > + * Set EQ and TX launch amplitudes as follows
> > > + * LANE0.TX_OVRD_DRV_LO.PREEMPH set based on SoC version
> > > + * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 110
> > > + * LANE0.TX_OVRD_DRV_LO.EN set to 1.
> > > + */
> > > + ret = usb_ss_read_phycreg(phy_dwc3,
> > > + SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
> > > + data |= TX_OVRD_DRV_LO_PREEMPH(phy_dwc3-
> > >tx_deamp_3_5db);
> > > + data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
> > > + data |= 0x6E;
> > > + data |= TX_OVRD_DRV_LO_EN;
> > > + ret = usb_ss_write_phycreg(phy_dwc3,
> > > + SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
> > > + if (ret)
> > > + goto err_phy_trans;
> > > +
> > > + data = 0;
> > > + data &= ~SSPHY_MPLL_MASK;
> > > + data |= SSPHY_MPLL(phy_dwc3->mpll);
> > > + usb_ss_write_phycreg(phy_dwc3, 0x30, data);
> > > +
> > > + /*
> > > + * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
> > > + * TX_FULL_SWING [26:20] amplitude to 110
> > > + * TX_DEEMPH_6DB [19:14] to 32
> > > + * TX_DEEMPH_3_5DB [13:8] set based on SoC version
> > > + * LOS_BIAS [7:3] to 9
> > > + */
> > > + data = readl(phy_dwc3->base + SSUSB_PHY_PARAM_CTRL_1);
> > > +
> > > + data &= ~PHY_PARAM_CTRL1_MASK;
> > > +
> > > + data |= PHY_PARAM_CTRL1_TX_FULL_SWING(0x6e) |
> > > + PHY_PARAM_CTRL1_TX_DEEMPH_6DB(0x20) |
> > > + PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(phy_dwc3-
> > >tx_deamp_3_5db) |
> > > + PHY_PARAM_CTRL1_LOS_BIAS(0x9);
> > > +
> > > + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
> > > + PHY_PARAM_CTRL1_MASK, data);
> > > +
> > > +err_phy_trans:
> > > + return ret;
> > > +}
> > > +
> > > +static int qcom_ipq806x_usb_ss_phy_exit(struct phy *phy)
> > > +{
> > > + struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
> > > +
> > > + /* Sequence to put SSPHY in low power state:
> > > + * 1. Clear REF_PHY_EN in PHY_CTRL_REG
> > > + * 2. Clear REF_USE_PAD in PHY_CTRL_REG
> > > + * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY
> > retention
> > > + */
> > > + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> > > + SSUSB_CTRL_SS_PHY_EN, 0x0);
> > > + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> > > + SSUSB_CTRL_REF_USE_PAD, 0x0);
> > > + usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
> > > + SSUSB_CTRL_TEST_POWERDOWN, 0x0);
> > > +
> > > + clk_disable_unprepare(phy_dwc3->ref_clk);
> > > + clk_disable_unprepare(phy_dwc3->xo_clk);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct phy_drvdata qcom_ipq806x_usb_hs_drvdata = {
> > > + .ops = {
> > > + .init = qcom_ipq806x_usb_hs_phy_init,
> > > + .exit = qcom_ipq806x_usb_hs_phy_exit,
> > > + .owner = THIS_MODULE,
> > > + },
> > > + .clk_rate = 60000000,
> > > +};
> > > +
> > > +static const struct phy_drvdata qcom_ipq806x_usb_ss_drvdata = {
> > > + .ops = {
> > > + .init = qcom_ipq806x_usb_ss_phy_init,
> > > + .exit = qcom_ipq806x_usb_ss_phy_exit,
> > > + .owner = THIS_MODULE,
> > > + },
> > > + .clk_rate = 125000000,
> > > +};
> > > +
> > > +static const struct of_device_id qcom_ipq806x_usb_phy_table[] = {
> > > + { .compatible = "qcom,ipq806x-usb-phy-hs",
> > > + .data = &qcom_ipq806x_usb_hs_drvdata },
> > > + { .compatible = "qcom,ipq806x-usb-phy-ss",
> > > + .data = &qcom_ipq806x_usb_ss_drvdata },
> > > + { /* Sentinel */ }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, qcom_ipq806x_usb_phy_table);
> > > +
> > > +static int qcom_ipq806x_usb_phy_probe(struct platform_device *pdev)
> > > +{
> > > + struct usb_phy *phy_dwc3;
> > > + struct phy_provider *phy_provider;
> > > + struct phy *generic_phy;
> > > + const struct of_device_id *match;
> > > + const struct phy_drvdata *data;
> > > + struct resource *res;
> > > + resource_size_t size;
> > > + struct device_node *np;
> > > +
> > > + phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3),
> > GFP_KERNEL);
> > > + if (!phy_dwc3)
> > > + return -ENOMEM;
> > > +
> > > + match = of_match_node(qcom_ipq806x_usb_phy_table, pdev-
> > >dev.of_node);
> > > + data = match->data;
> > > +
> > > + phy_dwc3->dev = &pdev->dev;
> > > +
> > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + if (!res)
> > > + return -EINVAL;
> > > + size = resource_size(res);
> > > + phy_dwc3->base = devm_ioremap(phy_dwc3->dev, res->start,
> > size);
> > > +
> > > + if (IS_ERR(phy_dwc3->base)) {
> > > + dev_err(phy_dwc3->dev, "failed to map reg\n");
> > > + return PTR_ERR(phy_dwc3->base);
> > > + }
> > > +
> > > + phy_dwc3->ref_clk = devm_clk_get(phy_dwc3->dev, "ref");
> > > + if (IS_ERR(phy_dwc3->ref_clk)) {
> > > + dev_dbg(phy_dwc3->dev, "cannot get reference clock\n");
> > > + return PTR_ERR(phy_dwc3->ref_clk);
> > > + }
> > > +
> > > + clk_set_rate(phy_dwc3->ref_clk, data->clk_rate);
> > > +
> > > + phy_dwc3->xo_clk = devm_clk_get(phy_dwc3->dev, "xo");
> > > + if (IS_ERR(phy_dwc3->xo_clk)) {
> > > + dev_dbg(phy_dwc3->dev, "cannot get TCXO clock\n");
> > > + phy_dwc3->xo_clk = NULL;
> > > + }
> > > +
> > > + /* Parse device node to probe HSIO settings */
> > > + np = of_node_get(pdev->dev.of_node);
> > > + if (!of_compat_cmp(match->compatible, "qcom,ipq806x-usb-phy-
> > ss",
> > > + strlen(match->compatible))) {
> > > + if (of_property_read_u32(np, "qcom,rx-eq", &phy_dwc3-
> > >rx_eq) ||
> > > + of_property_read_u32(np, "qcom,tx-deamp_3_5db",
> > > + &phy_dwc3->tx_deamp_3_5db) ||
> > > + of_property_read_u32(np, "qcom,mpll", &phy_dwc3-
> > >mpll)) {
> > > + dev_err(phy_dwc3->dev, "cannot get HSIO settings
> > from device node, using default values\n");
> > > +
> > > + /* Default HSIO settings */
> > > + phy_dwc3->rx_eq = SSPHY_RX_EQ_VALUE;
> > > + phy_dwc3->tx_deamp_3_5db =
> > SSPHY_TX_DEEMPH_3_5DB;
> > > + phy_dwc3->mpll = SSPHY_MPLL_VALUE;
> > > + }
> > > + }
> > > +
> > > + generic_phy = devm_phy_create(phy_dwc3->dev, pdev-
> > >dev.of_node,
> > > + &data->ops);
> > > +
> > > + if (IS_ERR(generic_phy))
> > > + return PTR_ERR(generic_phy);
> > > +
> > > + phy_set_drvdata(generic_phy, phy_dwc3);
> > > + platform_set_drvdata(pdev, phy_dwc3);
> > > +
> > > + phy_provider = devm_of_phy_provider_register(phy_dwc3->dev,
> > > + of_phy_simple_xlate);
> > > +
> > > + if (IS_ERR(phy_provider))
> > > + return PTR_ERR(phy_provider);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static struct platform_driver qcom_ipq806x_usb_phy_driver = {
> > > + .probe = qcom_ipq806x_usb_phy_probe,
> > > + .driver = {
> > > + .name = "qcom-ipq806x-usb-phy",
> > > + .owner = THIS_MODULE,
> > > + .of_match_table = qcom_ipq806x_usb_phy_table,
> > > + },
> > > +};
> > > +
> > > +module_platform_driver(qcom_ipq806x_usb_phy_driver);
> > > +
> > > +MODULE_ALIAS("platform:phy-qcom-ipq806x-usb");
> > > +MODULE_LICENSE("GPL v2");
> > > +MODULE_AUTHOR("Andy Gross <agross@...eaurora.org>");
> > > +MODULE_AUTHOR("Ivan T. Ivanov <iivanov@...sol.com>");
> > > +MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");
> > > --
> > > 2.25.1
J.
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