[PATCH] arm: rpi: perform XHCI firmware upload only once

[Matthias Brugger]

On 17/09/2021 10:19, Marek Szyprowski wrote:
> XHCI firmware upload must be performed only once after initializing the
> PCI bridge. This fixes USB stack initialization after calling "usb stop;
> usb start" on Raspberry Pi 4B.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>

Looks good to me. I'll wait a bit more to see if Nicolas can do a review as well 
before queuing it.

Regards,
Matthias

> ---
>   arch/arm/mach-bcm283x/msg.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/arch/arm/mach-bcm283x/msg.c b/arch/arm/mach-bcm283x/msg.c
> index 347aece3cd..345f7fe2b7 100644
> --- a/arch/arm/mach-bcm283x/msg.c
> +++ b/arch/arm/mach-bcm283x/msg.c
> @@ -170,6 +170,12 @@ int bcm2711_notify_vl805_reset(void)
>   	ALLOC_CACHE_ALIGN_BUFFER(struct msg_notify_vl805_reset,
>   				 msg_notify_vl805_reset, 1);
>   	int ret;
> +	static int done = false;
> +
> +	if (done)
> +		return 0;
> +
> +	done = true;
>   
>   	BCM2835_MBOX_INIT_HDR(msg_notify_vl805_reset);
>   	BCM2835_MBOX_INIT_TAG(&msg_notify_vl805_reset->dev_addr,
>