4.14-stable review patch. If anyone has any objections, please let me know.
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From: Minas Harutyunyan hminas@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 johnyoun@synopsys.com Signed-off-by: Minas Harutyunyan hminas@synopsys.com Signed-off-by: Grigor Tovmasyan tovmasya@synopsys.com Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@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 @@ -979,6 +979,24 @@ 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);