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FROMLIST: usb: dwc2: resume root hub to handle disconnect of device

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When handle disconnect of the hcd during bus_suspend, hcd
needs to resume its root hub, otherwise the root hub will
not disconnect the existing devices under its port.

This issue always happens when connecting with usb devices
which support auto-suspend function (e.g. usb hub).

(am from https://patchwork.kernel.org/patch/9751469/)
Change-Id: I663fdea73f36e89130d9a250612363968cbff941
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
This commit is contained in:
William Wu
2017-05-27 11:23:36 +08:00
committed by Frank Wang
parent 760022a209
commit a068d93125
1 changed files with 7 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/usb/dwc2/hcd.c
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@@ -1827,11 +1827,13 @@ void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force)
* Without the extra check here we will end calling disconnect
* and won't get any future interrupts to handle the connect.
*/
if (!force) {
hprt0 = dwc2_readl(hsotg, HPRT0);
if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS))
dwc2_hcd_connect(hsotg);
}
hprt0 = dwc2_readl(hsotg, HPRT0);
if (!force && !(hprt0 & HPRT0_CONNDET) &&
(hprt0 & HPRT0_CONNSTS))
dwc2_hcd_connect(hsotg);
else if (hsotg->lx_state != DWC2_L0)
usb_hcd_resume_root_hub(hsotg->priv);
}
/**