Re: [PATCH 09/11] phy: tegra: xusb: Add Tegra234 support

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On 11/5/22 23:01, Vinod Koul wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 24-10-22, 15:41, Wayne Chang wrote:
>> From: Sing-Han Chen <singhanc@xxxxxxxxxx>
>>
>> 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.
> 
> why cant this patch be sent separately, are phy patches dependent on
> rest..? If not consider splitting per subsystem and sending
> independently..
> 

Thanks for the review.
Yes, tegra234_xusb_padctl_soc is added to enable Tegra234 features.
If we do not enable USB2 HW tracking, then we shall not have this change 
and reuse tegra194_xusb_padctl_soc as well.

The feature is new added for Tegra234 pad control against Tegra194.

>>
>> Signed-off-by: Sing-Han Chen <singhanc@xxxxxxxxxx>
>> Co-developed-by: Wayne Chang <waynec@xxxxxxxxxx>
>> Signed-off-by: Wayne Chang <waynec@xxxxxxxxxx>
>> ---
>>   drivers/phy/tegra/Makefile        |  1 +
>>   drivers/phy/tegra/xusb-tegra186.c | 65 +++++++++++++++++++++++++++++--
>>   drivers/phy/tegra/xusb.c          |  6 +++
>>   drivers/phy/tegra/xusb.h          | 23 +++++++++++
>>   4 files changed, 92 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..cc02cea65a21 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 +614,32 @@ 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);
> 
> Single line.. should this be dev_err
Thanks, I'll make it a single line.
The failure with polling on trk complete will not cause the failure of 
powering on the bias pad and thus we put it warning here.

thanks,
Wayne.

> 
>> +             }
>>
>> -     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 +665,13 @@ 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 +1595,8 @@ 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 +1652,31 @@ 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@xxxxxxxxxx>");
>> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
>> index 95091876c422..23d179b1a5b5 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..ec0b5b023ad1 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 +478,23 @@ 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_atomic(padctl->regs + offset, regval,
>> +                                      (regval & mask) == val, 1, us);
>> +     dev_dbg(padctl->dev, "%08lx poll > %08x\n", offset, regval);
>> +     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 +511,8 @@ 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 */
>> --
>> 2.25.1
> 
> --
> ~Vinod




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