>From USB 2.0 specification, section 9.4.5:
ClearFeature(ENDPOINT_HALT) request always results in
the data toggle being reinitialized to DATA0.
The hacky solution for now is to reset the toggle bit to DATA0 when
the host controller send a ClearFeature request on an endpoint.
Signed-off-by: Jules Maselbas <jmaselbas@xxxxxxxxx>
---
drivers/usb/dwc2/host.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/usb/dwc2/host.c b/drivers/usb/dwc2/host.c
index 28759a801..98f75744f 100644
--- a/drivers/usb/dwc2/host.c
+++ b/drivers/usb/dwc2/host.c
@@ -109,6 +109,14 @@ static void dwc2_hc_init(struct dwc2 *dwc2, uint8_t hc,
dwc2_writel(dwc2, 0, HCSPLT(hc));
}
+static void dwc2_endpoint_reset(struct dwc2 *dwc2, int in, int devnum, int ep)
+{
+ if (in)
+ dwc2->in_data_toggle[devnum][ep] = TSIZ_SC_MC_PID_DATA0;
+ else
+ dwc2->out_data_toggle[devnum][ep] = TSIZ_SC_MC_PID_DATA0;
+}
+
static int wait_for_chhltd(struct dwc2 *dwc2, u8 hc, uint32_t *sub, u8 *tgl)
{
int ret;
@@ -373,7 +381,18 @@ static int dwc2_submit_control_msg(struct usb_device *udev,
if (ret)
return ret;
+ if (setup->requesttype == USB_RECIP_ENDPOINT
+ && setup->request == USB_REQ_CLEAR_FEATURE) {
+ /* From USB 2.0, section 9.4.5:
+ * ClearFeature(ENDPOINT_HALT) request always results
+ * in the data toggle being reinitialized to DATA0.
+ */
+ int ep = le16_to_cpu(setup->index) & 0xf;
+ dwc2_endpoint_reset(dwc2, usb_pipein(pipe), devnum, ep);
+ }
+
udev->act_len = act_len;
+ udev->status = 0;
return 0;
}
--
2.17.1
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