[PATCH v3] usb: gadget: fastboot: detach usb just before rebooting

[Mattijs Korpershoek]

Hi Dario,

Thank you for your patch.

On Sat, Jan 07, 2023 at 17:48, Dario Binacchi <dario.binacchi at amarulasolutions.com> wrote:

> The patch fixes the following error when updating a BSH SMM S2 board:
> 3:72>Start Cmd:FB[-t 8000]: ucmd nand write ${loadaddr} nanddtb ${filesize}
> 3:72>Okay (0.023s)
> 3:72>Start Cmd:FB: reboot
> 3:72>Fail Bulk(R):LIBUSB_ERROR_IO(0s)
>
> The "fastboot reboot" command detaches the USB when it still needs to be
> used. So let's detach the USB just before the reset.
>
> CC: Mattijs Korpershoek <mkorpershoek at baylibre.com>
> Fixes: 5f7e01e9d5d800 ("usb: gadget: fastboot: detach usb on reboot commands")
> Suggested-by: Michael Trimarchi <michael at amarulasolutions.com>
> Co-developed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
> Signed-off-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
> Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>

I've re-ran this on my vim3l. This patch, alongside with an
implementation of usb_gadget_ops.pullup() in
drivers/usb/gadget/dwc2_udc_otg.c also fixes the issue described in
commit 5f7e01e9d5d800 ("usb: gadget: fastboot: detach usb on reboot commands")

Tested-by Mattijs Korpershoek <mkorpershoek at baylibre.com>

I will submit the pullup() implementation on my end, indepently from
this change.

Marek, is it possible to pick this up to resolve Dario's flashing problems?

>
> ---
>
> Changes in v3:
> - Replace do_exit_on_complete() with g_dnl_unregister().
> - Add 'Co-developed-by' tag.
>
> Changes in v2:
> - Add 'Suggested-by' tag.
>
>  drivers/usb/gadget/f_fastboot.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
> index 07b1681c8a9a..f4311328a2da 100644
> --- a/drivers/usb/gadget/f_fastboot.c
> +++ b/drivers/usb/gadget/f_fastboot.c
> @@ -421,6 +421,7 @@ static int fastboot_tx_write_str(const char *buffer)
>  
>  static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
>  {
> +	g_dnl_unregister();
>  	do_reset(NULL, 0, 0, NULL);
>  }
>  
> @@ -544,7 +545,6 @@ static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
>  		case FASTBOOT_COMMAND_REBOOT_FASTBOOTD:
>  		case FASTBOOT_COMMAND_REBOOT_RECOVERY:
>  			fastboot_func->in_req->complete = compl_do_reset;
> -			g_dnl_trigger_detach();
>  			break;
>  #if CONFIG_IS_ENABLED(FASTBOOT_UUU_SUPPORT)
>  		case FASTBOOT_COMMAND_ACMD:
> -- 
> 2.32.0