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From 0103035be2b28a8dbb5ccc207c61043d5eb1bc18 Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Fri, 10 Mar 2023 14:21:42 +0000
Subject: [PATCH] usb: xhci: drop and add the endpoint context in
xhci_fixup_endpoint()
Setting both the Drop and Add bits on the input context prevents the
corruption of split transactions seen with the BCM2711 XHCI controller,
which is a dwc3 variant.
This is a downstream feature that allows usbhid to restrict polling
intervals on mice and keyboards, and was only tested on a VL805 which
didn't complain about the fact the endpoint got added twice.
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
drivers/usb/host/xhci.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1732,7 +1732,7 @@ static void xhci_fixup_endpoint(struct u
return;
}
ctrl_ctx->add_flags = xhci_get_endpoint_flag_from_index(ep_index);
- ctrl_ctx->drop_flags = 0;
+ ctrl_ctx->drop_flags = ctrl_ctx->add_flags;
spin_unlock_irqrestore(&xhci->lock, flags);
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