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usb: dwc2: hcd: Fix host channel halt flow 

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>
This commit is contained in:
Minas Harutyunyan 2018-01-19 14:43:53 +04:00 committed by Felipe Balbi
parent 9d729a7a7a
commit a82c7abdf8
1 changed files with 18 additions and 0 deletions
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18
drivers/usb/dwc2/hcd.c
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@ -977,6 +977,24 @@ 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);