On Mon, Mar 11, 2019 at 04:41:51PM +0530, Nagarjuna Kristam wrote:
> Tegra XUSB device control driver needs to control vbus override
> during its operations, add API for the support
>
> Signed-off-by: Nagarjuna Kristam <nkristam@xxxxxxxxxx>
> ---
> drivers/phy/tegra/xusb-tegra210.c | 61 +++++++++++++++++++++++++++++++++++++++
> drivers/phy/tegra/xusb.c | 28 ++++++++++++++++--
> drivers/phy/tegra/xusb.h | 2 ++
> include/linux/phy/tegra/xusb.h | 6 ++--
> 4 files changed, 92 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/phy/tegra/xusb-tegra210.c b/drivers/phy/tegra/xusb-tegra210.c
> index 48478bc4..be1a870 100644
> --- a/drivers/phy/tegra/xusb-tegra210.c
> +++ b/drivers/phy/tegra/xusb-tegra210.c
> @@ -73,6 +73,10 @@
> #define XUSB_PADCTL_USB3_PAD_MUX_PCIE_IDDQ_DISABLE(x) (1 << (1 + (x)))
> #define XUSB_PADCTL_USB3_PAD_MUX_SATA_IDDQ_DISABLE(x) (1 << (8 + (x)))
>
> +#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL0(x) (0x080 + (x) * 0x40)
> +#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIP (1 << 18)
> +#define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIN (1 << 22)
> +
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL1(x) (0x084 + (x) * 0x40)
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_SHIFT 7
> #define XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL1_VREG_LEV_MASK 0x3
> @@ -235,6 +239,12 @@
> #define XUSB_PADCTL_UPHY_USB3_PADX_ECTL6(x) (0xa74 + (x) * 0x40)
> #define XUSB_PADCTL_UPHY_USB3_PAD_ECTL6_RX_EQ_CTRL_H_VAL 0xfcf01368
>
> +#define XUSB_PADCTL_USB2_VBUS_ID 0xc60
> +#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON (1 << 14)
> +#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT 18
> +#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_MASK 0xf
> +#define XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_FLOATING 8
> +
> struct tegra210_xusb_fuse_calibration {
> u32 hs_curr_level[4];
> u32 hs_term_range_adj;
> @@ -2009,6 +2019,55 @@ static const struct tegra_xusb_port_ops tegra210_usb3_port_ops = {
> .map = tegra210_usb3_port_map,
> };
>
> +static int tegra210_xusb_padctl_vbus_override(struct tegra_xusb_padctl *padctl,
> + bool set)
I think "status" would perhaps be somewhat more meaningful.
> +{
> + u32 reg;
The rest of the driver uses "u32 value". It'd be good to be consistent.
> +
> + dev_dbg(padctl->dev, "%s vbus override\n", set ? "set" : "clear");
> +
> + reg = padctl_readl(padctl, XUSB_PADCTL_USB2_VBUS_ID);
> + if (set) {
> + reg |= XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON;
> + reg &= ~(XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_MASK <<
> + XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT);
> + reg |= XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_FLOATING <<
> + XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_SHIFT;
> + } else
> + reg &= ~XUSB_PADCTL_USB2_VBUS_ID_OVERRIDE_VBUS_ON;
This could use some blank lines to separate blocks and make it more
readable.
> + padctl_writel(padctl, reg, XUSB_PADCTL_USB2_VBUS_ID);
> +
> + return 0;
> +}
> +
> +static int tegra210_utmi_port_reset(struct phy *phy)
> +{
> + struct tegra_xusb_padctl *padctl;
> + struct tegra_xusb_lane *lane;
> + struct device *dev;
> + u32 reg;
u32 value
> +
> + if (!phy)
> + return -ENODEV;
When would this happen?
> +
> + lane = phy_get_drvdata(phy);
> + padctl = lane->pad->padctl;
> + dev = padctl->dev;
> +
> + reg = padctl_readl(padctl,
> + XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPADX_CTL0(0));
Usually subsequent lines are indented so that they align with the first
argument of the first line.
> + dev_dbg(dev, "BATTERY_CHRG_OTGPADX_CTL0(0): 0x%x\n", reg);
You can use %#x to avoid having to explicitly provide the 0x prefix.
Also, is this really useful for debugging? We could add trace support to
this driver (to padctl_readl() and padctl_writel() for example) to allow
for more flexible tracing of register programming sequences.
> +
> + if ((reg & XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIP) ||
> + (reg & XUSB_PADCTL_USB2_BATTERY_CHRG_OTGPAD_CTL0_ZIN)) {
> + dev_dbg(dev, "Toggle vbus\n");
This one is pretty redundant because the function calls below each
already output something to that effect.
> + tegra210_xusb_padctl_vbus_override(padctl, false);
> + tegra210_xusb_padctl_vbus_override(padctl, true);
> + return 1;
> + }
> + return 0;
> +}
> +
> static int
> tegra210_xusb_read_fuse_calibration(struct tegra210_xusb_fuse_calibration *fuse)
> {
> @@ -2071,6 +2130,8 @@ static const struct tegra_xusb_padctl_ops tegra210_xusb_padctl_ops = {
> .remove = tegra210_xusb_padctl_remove,
> .usb3_set_lfps_detect = tegra210_usb3_set_lfps_detect,
> .hsic_set_idle = tegra210_hsic_set_idle,
> + .vbus_override = tegra210_xusb_padctl_vbus_override,
> + .utmi_port_reset = tegra210_utmi_port_reset,
> };
>
> const struct tegra_xusb_padctl_soc tegra210_xusb_padctl_soc = {
> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
> index e89746d..bbb839b 100644
> --- a/drivers/phy/tegra/xusb.c
> +++ b/drivers/phy/tegra/xusb.c
> @@ -1027,7 +1027,7 @@ int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
> if (padctl->soc->ops->usb3_save_context)
> return padctl->soc->ops->usb3_save_context(padctl, port);
>
> - return -ENOSYS;
> + return -ENOTSUPP;
> }
> EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
>
> @@ -1037,7 +1037,7 @@ int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
> if (padctl->soc->ops->hsic_set_idle)
> return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
>
> - return -ENOSYS;
> + return -ENOTSUPP;
> }
> EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
>
> @@ -1048,10 +1048,32 @@ int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
> return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
> enable);
>
> - return -ENOSYS;
> + return -ENOTSUPP;
> }
> EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
I think these changes should be a separate patch.
Thierry
>
> +int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
> + bool val)
> +{
> + if (padctl->soc->ops->vbus_override)
> + return padctl->soc->ops->vbus_override(padctl, val);
> +
> + return -ENOTSUPP;
> +}
> +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_set_vbus_override);
> +
> +int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
> +{
> + struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
> + struct tegra_xusb_padctl *padctl = lane->pad->padctl;
> +
> + if (padctl->soc->ops->utmi_port_reset)
> + return padctl->soc->ops->utmi_port_reset(phy);
> +
> + return -ENOTSUPP;
> +}
> +EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);
> +
> MODULE_AUTHOR("Thierry Reding <treding@xxxxxxxxxx>");
> MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
> MODULE_LICENSE("GPL v2");
> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
> index b263165..9a39b05 100644
> --- a/drivers/phy/tegra/xusb.h
> +++ b/drivers/phy/tegra/xusb.h
> @@ -356,6 +356,8 @@ struct tegra_xusb_padctl_ops {
> unsigned int index, bool idle);
> int (*usb3_set_lfps_detect)(struct tegra_xusb_padctl *padctl,
> unsigned int index, bool enable);
> + int (*vbus_override)(struct tegra_xusb_padctl *padctl, bool set);
> + int (*utmi_port_reset)(struct phy *phy);
> };
>
> struct tegra_xusb_padctl_soc {
> diff --git a/include/linux/phy/tegra/xusb.h b/include/linux/phy/tegra/xusb.h
> index 8e1a57a..9b8351c 100644
> --- a/include/linux/phy/tegra/xusb.h
> +++ b/include/linux/phy/tegra/xusb.h
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2016-2019, NVIDIA CORPORATION. All rights reserved.
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms and conditions of the GNU General Public License,
> @@ -26,5 +26,7 @@ int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
> unsigned int port, bool idle);
> int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
> unsigned int port, bool enable);
> -
> +int tegra_xusb_padctl_set_vbus_override(struct tegra_xusb_padctl *padctl,
> + bool val);
> +int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
> #endif /* PHY_TEGRA_XUSB_H */
> --
> 2.7.4
>
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