[U-Boot] [PATCH v3] fastboot: add support for reboot-bootloader command

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Alexey,

> The "fastboot reboot-bootloader" command is defined to
> re-enter into fastboot mode after rebooting into
> bootloader. This command is usually used after updating
> bootloader via fastboot.
> 
> This commit implements only a generic side of the
> command - setting of the reset flag and then resetting.
> Setting of the reset flag is implemented using __weak
> fb_set_reboot_flag() function. The actual setting and
> checking of the reset flag should be implemented by
> a boot script and/or board/SoC specific code.
> 
> Signed-off-by: Alexey Firago <alexey_firago@mentor.com>
> ---
> 
> Changes in v3:
> - return -ENOSYS from default fb_set_reboot_flag()
> 
> Changes in v2:
> - return error in default fb_set_reboot_flag()
> 
>  drivers/usb/gadget/f_fastboot.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/usb/gadget/f_fastboot.c
> b/drivers/usb/gadget/f_fastboot.c index 310175a..a000c25 100644
> --- a/drivers/usb/gadget/f_fastboot.c
> +++ b/drivers/usb/gadget/f_fastboot.c
> @@ -122,6 +122,7 @@ static struct usb_gadget_strings
> *fastboot_strings[] = { };
>  
>  static void rx_handler_command(struct usb_ep *ep, struct usb_request
> *req); +static int strcmp_l1(const char *s1, const char *s2);
>  
>  static void fastboot_complete(struct usb_ep *ep, struct usb_request
> *req) {
> @@ -317,8 +318,20 @@ static void compl_do_reset(struct usb_ep *ep,
> struct usb_request *req) do_reset(NULL, 0, 0, NULL);
>  }
>  
> +int __weak fb_set_reboot_flag(void)
> +{
> +	return -ENOSYS;
> +}
> +
>  static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
>  {
> +	char *cmd = req->buf;
> +	if (!strcmp_l1("reboot-bootloader", cmd)) {
> +		if (fb_set_reboot_flag()) {
> +			fastboot_tx_write_str("FAILCannot set reboot
> flag");
> +			return;
> +		}
> +	}
>  	fastboot_func->in_req->complete = compl_do_reset;
>  	fastboot_tx_write_str("OKAY");
>  }

Applied to u-boot-dfu.

Thanks for patch!

-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group