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 <[email protected]> --- 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, -- 2.17.1
