linux-kernel - Re: [PATCH v2 1/2] usb: core: phy: add support for PHY calibration

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Date:   Sun, 28 Jul 2019 17:57:57 +0200
From:   Jochen Sprickerhof <jochen@...ickerhof.de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Anand Moon <linux.amoon@...il.com>,
        Linux USB Mailing List <linux-usb@...r.kernel.org>,
        linux-samsung-soc@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH v2 1/2] usb: core: phy: add support for PHY calibration

Hi Marek,

thanks for working on this!

Tested on my XU4
Tested-by: Jochen Sprickerhof <jochen@...ickerhof.de>

* Anand Moon <linux.amoon@...il.com> [2019-07-23 00:30]:
>Hi Marek,
>
>On Fri, 19 Jul 2019 at 13:43, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
>>
>> Some PHYs (for example Exynos5 USB3.0 DRD PHY) require calibration to be
>> done after every USB HCD reset. Generic PHY framework has been already
>> extended with phy_calibrate() function in commit 36914111e682 ("drivers:
>> phy: add calibrate method"). This patch adds support for it to generic
>> PHY handling code in USB HCD core.
>>
>
>Tested on my XU3 / XU4 / HC1
>Tested-by: Anand Moon <linux.amoon@...il.com>
>
>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
>> ---
>>  drivers/usb/core/hcd.c |  7 +++++++
>>  drivers/usb/core/phy.c | 21 +++++++++++++++++++++
>>  drivers/usb/core/phy.h |  1 +
>>  3 files changed, 29 insertions(+)
>>
>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>> index 88533938ce19..b89936c1df23 100644
>> --- a/drivers/usb/core/hcd.c
>> +++ b/drivers/usb/core/hcd.c
>> @@ -2291,6 +2291,9 @@ int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
>>         hcd->state = HC_STATE_RESUMING;
>>         status = hcd->driver->bus_resume(hcd);
>>         clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
>> +       if (status == 0)
>> +               status = usb_phy_roothub_calibrate(hcd->phy_roothub);
>> +
>>         if (status == 0) {
>>                 struct usb_device *udev;
>>                 int port1;
>> @@ -2864,6 +2867,10 @@ int usb_add_hcd(struct usb_hcd *hcd,
>>         }
>>         hcd->rh_pollable = 1;
>>
>> +       retval = usb_phy_roothub_calibrate(hcd->phy_roothub);
>> +       if (retval)
>> +               goto err_hcd_driver_setup;
>> +
>>         /* NOTE: root hub and controller capabilities may not be the same */
>>         if (device_can_wakeup(hcd->self.controller)
>>                         && device_can_wakeup(&hcd->self.root_hub->dev))
>> diff --git a/drivers/usb/core/phy.c b/drivers/usb/core/phy.c
>> index 7580493b867a..fb1588e7c282 100644
>> --- a/drivers/usb/core/phy.c
>> +++ b/drivers/usb/core/phy.c
>> @@ -151,6 +151,27 @@ int usb_phy_roothub_set_mode(struct usb_phy_roothub *phy_roothub,
>>  }
>>  EXPORT_SYMBOL_GPL(usb_phy_roothub_set_mode);
>>
>> +int usb_phy_roothub_calibrate(struct usb_phy_roothub *phy_roothub)
>> +{
>> +       struct usb_phy_roothub *roothub_entry;
>> +       struct list_head *head;
>> +       int err;
>> +
>> +       if (!phy_roothub)
>> +               return 0;
>> +
>> +       head = &phy_roothub->list;
>> +
>> +       list_for_each_entry(roothub_entry, head, list) {
>> +               err = phy_calibrate(roothub_entry->phy);
>> +               if (err)
>> +                       return err;
>> +       }
>> +
>> +       return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(usb_phy_roothub_calibrate);
>> +
>>  int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub)
>>  {
>>         struct usb_phy_roothub *roothub_entry;
>> diff --git a/drivers/usb/core/phy.h b/drivers/usb/core/phy.h
>> index dad564e2d2d4..20a267cd986b 100644
>> --- a/drivers/usb/core/phy.h
>> +++ b/drivers/usb/core/phy.h
>> @@ -18,6 +18,7 @@ int usb_phy_roothub_exit(struct usb_phy_roothub *phy_roothub);
>>
>>  int usb_phy_roothub_set_mode(struct usb_phy_roothub *phy_roothub,
>>                              enum phy_mode mode);
>> +int usb_phy_roothub_calibrate(struct usb_phy_roothub *phy_roothub);
>>  int usb_phy_roothub_power_on(struct usb_phy_roothub *phy_roothub);
>>  void usb_phy_roothub_power_off(struct usb_phy_roothub *phy_roothub);
>>
>> --
>> 2.17.1
>>
>

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