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Message-ID: <YxS6FBeyS1Cs7xhI@matsya>
Date: Sun, 4 Sep 2022 20:15:40 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Jim Lin <jilin@...dia.com>
Cc: jckuo@...dia.com, thierry.reding@...il.com, jonathanh@...dia.com,
balbi@...nel.org, gregkh@...uxfoundation.org, bhsieh@...dia.com,
linux-phy@...ts.infradead.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/2] phy: tegra: xusb: add utmi pad power on/down ops
On 16-08-22, 16:23, Jim Lin wrote:
> Add utmi_pad_power_on/down ops for each SOC instead of exporting
> tegra_phy_xusb_utmi_pad_power_on/down directly for Tegra186 chip.
Can you please help me understand why do we need to utmi power_on/down
exported and cant be handled thry phy-ops..
>
> Signed-off-by: BH Hsieh <bhsieh@...dia.com>
> Signed-off-by: Jim Lin <jilin@...dia.com>
> ---
> v2: update copyright year
>
> drivers/phy/tegra/xusb-tegra186.c | 19 ++++++++++++-------
> drivers/phy/tegra/xusb.c | 22 +++++++++++++++++++++-
> drivers/phy/tegra/xusb.h | 4 +++-
> include/linux/phy/tegra/xusb.h | 4 +++-
> 4 files changed, 39 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
> index ae3915ed9fef..5abdf81aa143 100644
> --- a/drivers/phy/tegra/xusb-tegra186.c
> +++ b/drivers/phy/tegra/xusb-tegra186.c
> @@ -1,6 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0
> /*
> - * Copyright (c) 2016-2020, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
> */
>
> #include <linux/delay.h>
> @@ -638,7 +638,7 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
> mutex_unlock(&padctl->lock);
> }
>
> -static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
> +static void tegra186_utmi_pad_power_on(struct phy *phy)
> {
> struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
> struct tegra_xusb_padctl *padctl = lane->pad->padctl;
> @@ -656,6 +656,8 @@ static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
> return;
> }
>
> + dev_dbg(dev, "power on UTMI pad %u\n", index);
> +
> tegra186_utmi_bias_pad_power_on(padctl);
>
> udelay(2);
> @@ -669,7 +671,7 @@ static void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy)
> padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL1(index));
> }
>
> -static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
> +static void tegra186_utmi_pad_power_down(struct phy *phy)
> {
> struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
> struct tegra_xusb_padctl *padctl = lane->pad->padctl;
> @@ -679,6 +681,8 @@ static void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy)
> if (!phy)
> return;
>
> + dev_dbg(padctl->dev, "power down UTMI pad %u\n", index);
> +
> value = padctl_readl(padctl, XUSB_PADCTL_USB2_OTG_PADX_CTL0(index));
> value |= USB2_OTG_PD;
> padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL0(index));
> @@ -849,15 +853,14 @@ static int tegra186_utmi_phy_power_on(struct phy *phy)
> value |= RPD_CTRL(priv->calib.rpd_ctrl);
> padctl_writel(padctl, value, XUSB_PADCTL_USB2_OTG_PADX_CTL1(index));
>
> - /* TODO: pad power saving */
> - tegra_phy_xusb_utmi_pad_power_on(phy);
> + tegra186_utmi_pad_power_on(phy);
> +
> return 0;
> }
>
> static int tegra186_utmi_phy_power_off(struct phy *phy)
> {
> - /* TODO: pad power saving */
> - tegra_phy_xusb_utmi_pad_power_down(phy);
> + tegra186_utmi_pad_power_down(phy);
>
> return 0;
> }
> @@ -1486,6 +1489,8 @@ static const struct tegra_xusb_padctl_ops tegra186_xusb_padctl_ops = {
> .suspend_noirq = tegra186_xusb_padctl_suspend_noirq,
> .resume_noirq = tegra186_xusb_padctl_resume_noirq,
> .vbus_override = tegra186_xusb_padctl_vbus_override,
> + .utmi_pad_power_on = tegra186_utmi_pad_power_on,
> + .utmi_pad_power_down = tegra186_utmi_pad_power_down,
> };
>
> #if IS_ENABLED(CONFIG_ARCH_TEGRA_186_SOC)
> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
> index 963de5913e50..49873718d54a 100644
> --- a/drivers/phy/tegra/xusb.c
> +++ b/drivers/phy/tegra/xusb.c
> @@ -1,6 +1,6 @@
> // SPDX-License-Identifier: GPL-2.0-only
> /*
> - * Copyright (c) 2014-2020, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2014-2022, NVIDIA CORPORATION. All rights reserved.
> */
>
> #include <linux/delay.h>
> @@ -1458,6 +1458,26 @@ int tegra_phy_xusb_utmi_port_reset(struct phy *phy)
> }
> EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_port_reset);
>
> +void tegra_phy_xusb_utmi_pad_power_on(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_pad_power_on)
> + padctl->soc->ops->utmi_pad_power_on(phy);
> +}
> +EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_pad_power_on);
> +
> +void tegra_phy_xusb_utmi_pad_power_down(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_pad_power_down)
> + padctl->soc->ops->utmi_pad_power_down(phy);
> +}
> +EXPORT_SYMBOL_GPL(tegra_phy_xusb_utmi_pad_power_down);
> +
> int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
> unsigned int port)
> {
> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
> index 034f7a2c28d6..8cfbbdbd6e0c 100644
> --- a/drivers/phy/tegra/xusb.h
> +++ b/drivers/phy/tegra/xusb.h
> @@ -1,6 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
> /*
> - * Copyright (c) 2014-2020, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2014-2022, NVIDIA CORPORATION. All rights reserved.
> * Copyright (c) 2015, Google Inc.
> */
>
> @@ -412,6 +412,8 @@ struct tegra_xusb_padctl_ops {
> unsigned int index, bool enable);
> int (*vbus_override)(struct tegra_xusb_padctl *padctl, bool set);
> int (*utmi_port_reset)(struct phy *phy);
> + void (*utmi_pad_power_on)(struct phy *phy);
> + void (*utmi_pad_power_down)(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 3a35e74cdc61..70998e6dd6fd 100644
> --- a/include/linux/phy/tegra/xusb.h
> +++ b/include/linux/phy/tegra/xusb.h
> @@ -1,6 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
> /*
> - * Copyright (c) 2016-2020, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2016-2022, NVIDIA CORPORATION. All rights reserved.
> */
>
> #ifndef PHY_TEGRA_XUSB_H
> @@ -21,6 +21,8 @@ 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);
> +void tegra_phy_xusb_utmi_pad_power_on(struct phy *phy);
> +void tegra_phy_xusb_utmi_pad_power_down(struct phy *phy);
> int tegra_phy_xusb_utmi_port_reset(struct phy *phy);
> int tegra_xusb_padctl_get_usb3_companion(struct tegra_xusb_padctl *padctl,
> unsigned int port);
> --
> 2.17.1
--
~Vinod
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