This patch triggers the host to send a control request to
clear the endpoint's Halt feature.
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
---
drivers/staging/most/usb/usb.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/staging/most/usb/usb.c b/drivers/staging/most/usb/usb.c
index 0624ca9..7577351 100644
--- a/drivers/staging/most/usb/usb.c
+++ b/drivers/staging/most/usb/usb.c
@@ -815,6 +815,21 @@ static void wq_clear_halt(struct work_struct *wq_obj)
if (usb_clear_halt(mdev->usb_device, pipe))
dev_warn(&mdev->usb_device->dev, "Failed to reset endpoint.\n");
+ /* If the functional Stall condition has been set on an
+ * asynchronous rx channel, we need to clear the tx channel
+ * too, since the hardware runs its clean-up sequence on both
+ * channels, as they are physically one on the network.
+ *
+ * The USB interface that exposes the asynchronous channels
+ * contains always two endpoints, and two only.
+ */
+ if (mdev->conf[channel].data_type == MOST_CH_ASYNC &&
+ mdev->conf[channel].direction == MOST_CH_RX) {
+ int peer = 1 - channel;
+ int snd_pipe = usb_sndbulkpipe(mdev->usb_device,
+ mdev->ep_address[peer]);
+ usb_clear_halt(mdev->usb_device, snd_pipe);
+ }
mdev->is_channel_healthy[channel] = true;
most_resume_enqueue(&mdev->iface, channel);
mutex_unlock(&mdev->io_mutex);
--
1.9.1
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