Hi,
Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> writes:
> Commit 50c763f8c1bac ("usb: dwc3: Set the ClearPendIN bit on Clear
> Stall EP command") sets ClearPendIN bit for all IN endpoints in
> v2.60a+ cores no matter which speed mode they're in. This causes
> Clear Stall EP command failing on some Intel devices.
Well, the fact that is fails on some Intel device is, IMO, a
symptom. You should have said that ClearStall command fails on 2.60+
operating in HighSpeed mode. That's the real failure. It doesn't matter
if it's Intel or not, what matters is the *current* speed.
> In page 539 of 2.60a specification, it says:
>
> "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 obviously that we only need to apply this rule to those IN
s/obviously/obvious/
> endpoints in SuperSpeed mode.
endpoints currently operating in SuperSpeed mode.
> Fixes: 50c763f8c1bac ("usb: dwc3: Set the ClearPendIN bit on Clear Stall EP command")
> Cc: stable@xxxxxxxxxxxxxxx # 4.7+
please use proper email format:
Cc: <stable@xxxxxxxxxxxxxxx> # v4.7+
> Signed-off-by: Lu Baolu <baolu.lu@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 7a8d3d8..f1858d6 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -348,7 +348,8 @@ 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->maximum_speed >= USB_SPEED_SUPER))
not sure this is correct. Based on text quoted above, it seems to be me
we should check *current* speed, not maximum speed. We hold current
speed in dwc->gadget.speed.
--
balbi
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