linux-kernel - Re: [PATCH] usb: Disable USB3 LPM at shutdown

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Message-ID: <CAAd53p7P_-4voZ49=WKpDCg9tx4QRV2NEG5FyqitsAc-Yzm2VA@mail.gmail.com>
Date: Tue, 26 Mar 2024 11:38:48 +0800
From: Kai-Heng Feng <kai.heng.feng@...onical.com>
To: gregkh@...uxfoundation.org
Cc: stern@...land.harvard.edu, mathias.nyman@...ux.intel.com, oneukum@...e.com, 
	Roy Luo <royluo@...gle.com>, Heiner Kallweit <hkallweit1@...il.com>, 
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: Disable USB3 LPM at shutdown

On Tue, Mar 5, 2024 at 2:52 PM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
> SanDisks USB3 storage may disapper after system reboot:
>
> usb usb2-port3: link state change
> xhci_hcd 0000:00:14.0: clear port3 link state change, portsc: 0x2c0
> usb usb2-port3: do warm reset, port only
> xhci_hcd 0000:00:14.0: xhci_hub_status_data: stopping usb2 port polling
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x2b0, return 0x2b0
> usb usb2-port3: not warm reset yet, waiting 50ms
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x2f0, return 0x2f0
> usb usb2-port3: not warm reset yet, waiting 200ms
> ...
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x6802c0, return 0x7002c0
> usb usb2-port3: not warm reset yet, waiting 200ms
> xhci_hcd 0000:00:14.0: clear port3 reset change, portsc: 0x4802c0
> xhci_hcd 0000:00:14.0: clear port3 warm(BH) reset change, portsc: 0x4002c0
> xhci_hcd 0000:00:14.0: clear port3 link state change, portsc: 0x2c0
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x2c0, return 0x2c0
> usb usb2-port3: not enabled, trying warm reset again...
>
> This is due to the USB device still cause port change event after xHCI is
> shuted down:
>
> xhci_hcd 0000:38:00.0: // Setting command ring address to 0xffffe001
> xhci_hcd 0000:38:00.0: xhci_resume: starting usb3 port polling.
> xhci_hcd 0000:38:00.0: xhci_hub_status_data: stopping usb4 port polling
> xhci_hcd 0000:38:00.0: xhci_hub_status_data: stopping usb3 port polling
> xhci_hcd 0000:38:00.0: hcd_pci_runtime_resume: 0
> xhci_hcd 0000:38:00.0: xhci_shutdown: stopping usb3 port polling.
> xhci_hcd 0000:38:00.0: // Halt the HC
> xhci_hcd 0000:38:00.0: xhci_shutdown completed - status = 1
> xhci_hcd 0000:00:14.0: xhci_shutdown: stopping usb1 port polling.
> xhci_hcd 0000:00:14.0: // Halt the HC
> xhci_hcd 0000:00:14.0: xhci_shutdown completed - status = 1
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x1203, return 0x203
> xhci_hcd 0000:00:14.0: set port reset, actual port 2-3 status  = 0x1311
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x201203, return 0x100203
> xhci_hcd 0000:00:14.0: clear port3 reset change, portsc: 0x1203
> xhci_hcd 0000:00:14.0: clear port3 warm(BH) reset change, portsc: 0x1203
> xhci_hcd 0000:00:14.0: clear port3 link state change, portsc: 0x1203
> xhci_hcd 0000:00:14.0: clear port3 connect change, portsc: 0x1203
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x1203, return 0x203
> usb 2-3: device not accepting address 2, error -108
> xhci_hcd 0000:00:14.0: xHCI dying or halted, can't queue_command
> xhci_hcd 0000:00:14.0: Set port 2-3 link state, portsc: 0x1203, write 0x11261
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x1263, return 0x263
> xhci_hcd 0000:00:14.0: set port reset, actual port 2-3 status  = 0x1271
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x12b1, return 0x2b1
> usb usb2-port3: not reset yet, waiting 60ms
> ACPI: PM: Preparing to enter system sleep state S5
> xhci_hcd 0000:00:14.0: Get port status 2-3 read: 0x12f1, return 0x2f1
> usb usb2-port3: not reset yet, waiting 200ms
> reboot: Restarting system
>
> The port change event is caused by LPM transition, so disabling LPM at shutdown
> to make sure the device is in U0 for warmboot.
>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

A gentle ping...

> ---
>  drivers/usb/core/port.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
> index c628c1abc907..c50266d7ce9d 100644
> --- a/drivers/usb/core/port.c
> +++ b/drivers/usb/core/port.c
> @@ -418,8 +418,10 @@ static void usb_port_shutdown(struct device *dev)
>  {
>         struct usb_port *port_dev = to_usb_port(dev);
>
> -       if (port_dev->child)
> +       if (port_dev->child) {
>                 usb_disable_usb2_hardware_lpm(port_dev->child);
> +               usb_unlocked_disable_lpm(port_dev->child);
> +       }
>  }
>
>  static const struct dev_pm_ops usb_port_pm_ops = {
> --
> 2.34.1
>