From: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
According databook in Buffer and External DMA mode
non-split periodic channels can't be halted.
Signed-off-by: Minas Harutyunyan <hminas@xxxxxxxxxxxx>
Signed-off-by: Grigor Tovmasyan <tovmasya@xxxxxxxxxxxx>
---
drivers/usb/dwc2/hcd.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 0eec6ddd1e07..a38b3cf9545b 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -973,6 +973,24 @@ void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan,
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "%s()\n", __func__);
+
+ /*
+ * In buffer DMA or external DMA mode channel can't be halted
+ * for non-split periodic channels. At the end of the next
+ * uframe/frame (in the worst case), the core generates a channel
+ * halted and disables the channel automatically.
+ */
+ if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) ||
+ hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) {
+ if (!chan->do_split &&
+ (chan->ep_type == USB_ENDPOINT_XFER_ISOC ||
+ chan->ep_type == USB_ENDPOINT_XFER_INT)) {
+ dev_err(hsotg->dev, "%s() Channel can't be halted\n",
+ __func__);
+ return;
+ }
+ }
+
if (halt_status == DWC2_HC_XFER_NO_HALT_STATUS)
dev_err(hsotg->dev, "!!! halt_status = %d !!!\n", halt_status);
--
2.11.0
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