4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Minas Harutyunyan <hmi...@synopsys.com>
[ Upstream commit a82c7abdf8fc3b09c4a0ed2eee6d43ecef2ccdb0 ]
According databook in Buffer and External DMA mode
non-split periodic channels can't be halted.
Acked-by: John Youn <johny...@synopsys.com>
Signed-off-by: Minas Harutyunyan <hmi...@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovma...@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/usb/dwc2/hcd.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -989,6 +989,24 @@ void dwc2_hc_halt(struct dwc2_hsotg *hso
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);
