This is a note to let you know that I've just added the patch titled
usb: dwc3: fix Clear Stall EP command failure
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
>From 5e6c88d28ccbe72bedee1fbf4f9fea4764208598 Mon Sep 17 00:00:00 2001
From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Fri, 9 Sep 2016 12:51:27 +0800
Subject: usb: dwc3: fix Clear Stall EP command failure
Commit 50c763f8c1bac ("usb: dwc3: Set the ClearPendIN bit on Clear
Stall EP command") sets ClearPendIN bit for all IN endpoints of
v2.60a+ cores. This causes ClearStall command fails on 2.60+ cores
operating in HighSpeed mode.
In page 539 of 2.60a specification:
"When issuing Clear Stall command for IN endpoints in SuperSpeed
mode, the software must set the "ClearPendIN" bit to '1' to
clear any pending IN transcations, so that the device does not
expect any ACK TP from the host for the data sent earlier."
It's obvious that we only need to apply this rule to those IN
endpoints that currently operating in SuperSpeed mode.
Fixes: 50c763f8c1bac ("usb: dwc3: Set the ClearPendIN bit on Clear Stall EP command")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.7+
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/gadget.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index a5d496dd53b2..e49082f9edeb 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -341,7 +341,8 @@ static int dwc3_send_clear_stall_ep_cmd(struct dwc3_ep *dep)
* IN transfers due to a mishandled error condition. Synopsys
* STAR 9000614252.
*/
- if (dep->direction && (dwc->revision >= DWC3_REVISION_260A))
+ if (dep->direction && (dwc->revision >= DWC3_REVISION_260A) &&
+ (dwc->gadget.speed >= USB_SPEED_SUPER))
cmd |= DWC3_DEPCMD_CLEARPENDIN;
memset(¶ms, 0, sizeof(params));
--
2.9.3
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