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Message-ID: <202a273f-4fdf-25ca-db1e-d1af81444cf5@nvidia.com>
Date: Tue, 15 Nov 2022 12:22:14 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Wayne Chang <waynec@...dia.com>, gregkh@...uxfoundation.org,
robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
treding@...dia.com, thierry.reding@...il.com,
heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
vkoul@...nel.org, p.zabel@...gutronix.de, balbi@...nel.org,
mathias.nyman@...el.com, jckuo@...dia.com
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, singhanc@...dia.com,
linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
linux-tegra@...r.kernel.org
Subject: Re: [PATCH v3 11/13] phy: tegra: xusb: Add Tegra234 support
On 14/11/2022 12:40, Wayne Chang wrote:
> From: Sing-Han Chen <singhanc@...dia.com>
>
> Add support for the XUSB pad controller found on Tegra234 SoCs. It is
> mostly similar to the same IP found on Tegra194, because most of
> the Tegra234 XUSB PADCTL registers definition and programming sequence
> are the same as Tegra194, Tegra234 XUSB PADCTL can share the same
> driver with Tegra186 and Tegra194 XUSB PADCTL.
>
> Introduce a new feature, USB2 HW tracking, for Tegra234.
> The feature is to enable HW periodical PAD tracking which measure
> and capture the electric parameters of USB2.0 PAD.
>
> Signed-off-by: Sing-Han Chen <singhanc@...dia.com>
> Co-developed-by: Wayne Chang <waynec@...dia.com>
> Signed-off-by: Wayne Chang <waynec@...dia.com>
> ---
> V2 -> V3:nothing has changed
> V1 -> V2:remove atomic and the helper in padctl_readl_poll func.
> drivers/phy/tegra/Makefile | 1 +
> drivers/phy/tegra/xusb-tegra186.c | 64 +++++++++++++++++++++++++++++--
> drivers/phy/tegra/xusb.c | 6 +++
> drivers/phy/tegra/xusb.h | 22 +++++++++++
> 4 files changed, 90 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/phy/tegra/Makefile b/drivers/phy/tegra/Makefile
> index 89b84067cb4c..eeeea72de117 100644
> --- a/drivers/phy/tegra/Makefile
> +++ b/drivers/phy/tegra/Makefile
> @@ -7,4 +7,5 @@ phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_132_SOC) += xusb-tegra124.o
> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_210_SOC) += xusb-tegra210.o
> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_186_SOC) += xusb-tegra186.o
> phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_194_SOC) += xusb-tegra186.o
> +phy-tegra-xusb-$(CONFIG_ARCH_TEGRA_234_SOC) += xusb-tegra186.o
> obj-$(CONFIG_PHY_TEGRA194_P2U) += phy-tegra194-p2u.o
> diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
> index f121b4ffbbfd..5ae3cea19c84 100644
> --- a/drivers/phy/tegra/xusb-tegra186.c
> +++ b/drivers/phy/tegra/xusb-tegra186.c
> @@ -89,6 +89,11 @@
> #define USB2_TRK_START_TIMER(x) (((x) & 0x7f) << 12)
> #define USB2_TRK_DONE_RESET_TIMER(x) (((x) & 0x7f) << 19)
> #define USB2_PD_TRK BIT(26)
> +#define USB2_TRK_COMPLETED BIT(31)
> +
> +#define XUSB_PADCTL_USB2_BIAS_PAD_CTL2 0x28c
> +#define USB2_TRK_HW_MODE BIT(0)
> +#define CYA_TRK_CODE_UPDATE_ON_IDLE BIT(31)
>
> #define XUSB_PADCTL_HSIC_PADX_CTL0(x) (0x300 + (x) * 0x20)
> #define HSIC_PD_TX_DATA0 BIT(1)
> @@ -609,9 +614,31 @@ static void tegra186_utmi_bias_pad_power_on(struct tegra_xusb_padctl *padctl)
> value &= ~USB2_PD_TRK;
> padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>
> - udelay(100);
> + if (padctl->soc->poll_trk_completed) {
> + err = padctl_readl_poll(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL1,
> + USB2_TRK_COMPLETED, USB2_TRK_COMPLETED, 100);
> + if (err) {
> + /* The failure with polling on trk complete will not
> + * cause the failure of powering on the bias pad.
> + */
> + dev_warn(dev, "failed to poll USB2 trk completed: %d\n", err);
> + }
>
> - clk_disable_unprepare(priv->usb2_trk_clk);
> + value = padctl_readl(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
> + value |= USB2_TRK_COMPLETED;
> + padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
> + } else {
> + udelay(100);
> + }
> +
> + if (padctl->soc->trk_hw_mode) {
> + value = padctl_readl(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL2);
> + value |= USB2_TRK_HW_MODE;
> + value &= ~CYA_TRK_CODE_UPDATE_ON_IDLE;
> + padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL2);
> + } else {
> + clk_disable_unprepare(priv->usb2_trk_clk);
> + }
>
> mutex_unlock(&padctl->lock);
> }
> @@ -637,6 +664,13 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
> value |= USB2_PD_TRK;
> padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
>
> + if (padctl->soc->trk_hw_mode) {
> + value = padctl_readl(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL2);
> + value &= ~USB2_TRK_HW_MODE;
> + padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL2);
> + clk_disable_unprepare(priv->usb2_trk_clk);
> + }
> +
> mutex_unlock(&padctl->lock);
> }
>
> @@ -1560,7 +1594,8 @@ const struct tegra_xusb_padctl_soc tegra186_xusb_padctl_soc = {
> EXPORT_SYMBOL_GPL(tegra186_xusb_padctl_soc);
> #endif
>
> -#if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC)
> +#if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC) || \
> + IS_ENABLED(CONFIG_ARCH_TEGRA_234_SOC)
> static const char * const tegra194_xusb_padctl_supply_names[] = {
> "avdd-usb",
> "vclamp-usb",
> @@ -1616,8 +1651,31 @@ const struct tegra_xusb_padctl_soc tegra194_xusb_padctl_soc = {
> .supply_names = tegra194_xusb_padctl_supply_names,
> .num_supplies = ARRAY_SIZE(tegra194_xusb_padctl_supply_names),
> .supports_gen2 = true,
> + .poll_trk_completed = true,
> };
> EXPORT_SYMBOL_GPL(tegra194_xusb_padctl_soc);
> +
> +const struct tegra_xusb_padctl_soc tegra234_xusb_padctl_soc = {
> + .num_pads = ARRAY_SIZE(tegra194_pads),
> + .pads = tegra194_pads,
> + .ports = {
> + .usb2 = {
> + .ops = &tegra186_usb2_port_ops,
> + .count = 4,
> + },
> + .usb3 = {
> + .ops = &tegra186_usb3_port_ops,
> + .count = 4,
> + },
> + },
> + .ops = &tegra186_xusb_padctl_ops,
> + .supply_names = tegra194_xusb_padctl_supply_names,
> + .num_supplies = ARRAY_SIZE(tegra194_xusb_padctl_supply_names),
> + .supports_gen2 = true,
> + .poll_trk_completed = true,
> + .trk_hw_mode = true,
> +};
> +EXPORT_SYMBOL_GPL(tegra234_xusb_padctl_soc);
> #endif
>
> MODULE_AUTHOR("JC Kuo <jckuo@...dia.com>");
> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
> index dce45fbbd699..c2f160628552 100644
> --- a/drivers/phy/tegra/xusb.c
> +++ b/drivers/phy/tegra/xusb.c
> @@ -71,6 +71,12 @@ static const struct of_device_id tegra_xusb_padctl_of_match[] = {
> .compatible = "nvidia,tegra194-xusb-padctl",
> .data = &tegra194_xusb_padctl_soc,
> },
> +#endif
> +#if defined(CONFIG_ARCH_TEGRA_234_SOC)
> + {
> + .compatible = "nvidia,tegra234-xusb-padctl",
> + .data = &tegra234_xusb_padctl_soc,
> + },
> #endif
> { }
> };
> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
> index 8cfbbdbd6e0c..a21826c730d7 100644
> --- a/drivers/phy/tegra/xusb.h
> +++ b/drivers/phy/tegra/xusb.h
> @@ -8,6 +8,7 @@
> #define __PHY_TEGRA_XUSB_H
>
> #include <linux/io.h>
> +#include <linux/iopoll.h>
> #include <linux/mutex.h>
> #include <linux/workqueue.h>
>
> @@ -433,6 +434,8 @@ struct tegra_xusb_padctl_soc {
> unsigned int num_supplies;
> bool supports_gen2;
> bool need_fake_usb3_port;
> + bool poll_trk_completed;
> + bool trk_hw_mode;
> };
>
> struct tegra_xusb_padctl {
> @@ -475,6 +478,22 @@ static inline u32 padctl_readl(struct tegra_xusb_padctl *padctl,
> return value;
> }
>
> +static inline u32 padctl_readl_poll(struct tegra_xusb_padctl *padctl,
> + unsigned long offset, u32 val, u32 mask, int us)
> +{
> + u32 regval;
> + int err;
> +
> + err = readl_poll_timeout(padctl->regs + offset, regval,
> + (regval & mask) == val, 1, us);
> + if (err) {
> + dev_err(padctl->dev, "%08lx poll timeout > %08x\n", offset,
> + regval);
> + }
> +
> + return err;
> +}
> +
> struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
> const char *name,
> unsigned int index);
> @@ -491,5 +510,8 @@ extern const struct tegra_xusb_padctl_soc tegra186_xusb_padctl_soc;
> #if defined(CONFIG_ARCH_TEGRA_194_SOC)
> extern const struct tegra_xusb_padctl_soc tegra194_xusb_padctl_soc;
> #endif
> +#if defined(CONFIG_ARCH_TEGRA_234_SOC)
> +extern const struct tegra_xusb_padctl_soc tegra234_xusb_padctl_soc;
> +#endif
>
> #endif /* __PHY_TEGRA_XUSB_H */
Reviewed-by: Jon Hunter <jonathanh@...dia.com>
Thanks
Jon
--
nvpublic
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