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UPSTREAM: usb: dwc2: gadget: Fix transfer stop programming for out endpoint

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According DWC-OTG databook, "GOUTNakEff" is read only and can be
cleared only by "DCTL.CGOUTNak", but here we do not need to clear
it because DWC-OTG programming guide says that before disabling
any OUT endpoint, the application must enable Global OUT NAK mode,
so if this mode is enabled we can continue without this step.

Change-Id: If85da6787d585582712ca5d116db52caa70e72fc
Tested-by: John Keeping <john@metanate.com>
Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Huang, Tao <huangtao@rock-chips.com>
(cherry picked from commit 6b58cb07a8)
This commit is contained in:
Vardan Mikayelyan
2016-05-25 18:07:02 -07:00
committed by Huang, Tao
parent d0e9fbb5e2
commit 626df6922b
1 changed files with 2 additions and 4 deletions
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6
drivers/usb/dwc2/gadget.c
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@@ -2866,10 +2866,8 @@ static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg,
dev_warn(hsotg->dev,
"%s: timeout DIEPINT.NAKEFF\n", __func__);
} else {
/* Clear any pending nak effect interrupt */
dwc2_writel(GINTSTS_GOUTNAKEFF, hsotg->regs + GINTSTS);
__orr32(hsotg->regs + DCTL, DCTL_SGOUTNAK);
if (!(dwc2_readl(hsotg->regs + GINTSTS) & GINTSTS_GOUTNAKEFF))
__orr32(hsotg->regs + DCTL, DCTL_SGOUTNAK);
/* Wait for global nak to take effect */
if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS,