usb: gadget: tegra-xudc: Always reinitialize data toggle when clear halt

commit 2585973c7f9ee31d21e5848c996fab2521fd383d upstream.

The driver previously skipped handling ClearFeature(ENDPOINT_HALT)
when the endpoint was already not halted. This prevented the
controller from resetting the data sequence number and reinitializing
the endpoint state.

According to USB 3.2 specification Rev. 1.1, section 9.4.5,
ClearFeature(ENDPOINT_HALT) must always reset the data sequence and
set the stream state machine to Disabled, regardless of whether the
endpoint was halted.

Remove the early return so that ClearFeature(ENDPOINT_HALT) always
resets the endpoint sequence state as required by the specification.

Fixes: 49db427232fe ("usb: gadget: Add UDC driver for tegra XUSB device mode controller")
Cc: stable <stable@kernel.org>
Signed-off-by: Haotien Hsu <haotienh@nvidia.com>
Signed-off-by: Wayne Chang <waynec@nvidia.com>
Link: https://patch.msgid.link/20251127033540.2287517-1-waynec@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 9bb54da8a6ae15de4fdcfd2725e79fcd8daf2d0d..3a14b6b72d8c6fbd37ed3ab60d13906e41c8cf87 100644 (file)
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -1554,12 +1554,6 @@ static int __tegra_xudc_ep_set_halt(struct tegra_xudc_ep *ep, bool halt)
                return -ENOTSUPP;
        }
 
-       if (!!(xudc_readl(xudc, EP_HALT) & BIT(ep->index)) == halt) {
-               dev_dbg(xudc->dev, "EP %u already %s\n", ep->index,
-                       halt ? "halted" : "not halted");
-               return 0;
-       }
-
        if (halt) {
                ep_halt(xudc, ep->index);
        } else {