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 13a2f5276072adfa05ec79608ad689432ee3ee10..7102a4d3971f7206bcc13065ed98f42ed9b7f967 100644 (file)
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -1542,12 +1542,6 @@ 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 {