On 01/05/2015 09:02 PM, Paul Zimmerman wrote: >> From: Kever Yang [mailto:kever.y...@rock-chips.com] >> Sent: Monday, January 05, 2015 5:42 PM >> >> Hi Paul, >> >> I think you need this patch to fix the problem: >> >> usb: dwc2: resume root hub when device detect with suspend state >> https://patchwork.kernel.org/patch/5325111/
This patch may have fixed hotplug when a device is connected directly to the USB port, but it does not seem to fix a hotplug when a device is connected to a hub. I booted the board up with a device connected to a 4-port hub, the device is detected, unplug the device from a hub, wait 5-sec, re-plug the device into hub. The device is not detected. >> >> Thanks, >> >> - Kever >> On 01/06/2015 09:23 AM, Paul Zimmerman wrote: >>>> From: Kever Yang [mailto:kever.y...@rock-chips.com] >>>> Sent: Wednesday, November 12, 2014 4:42 PM >>>> >>>> On 11/13/2014 07:22 AM, Doug Anderson wrote: >>>>> Kever, >>>>> >>>>> On Mon, Nov 10, 2014 at 5:09 AM, Kever Yang <kever.y...@rock-chips.com> >>>>> wrote: >>>>>> Hcd controller needs bus_suspend/resume, dwc2 controller make >>>>>> root hub generate suspend/resume signal with hprt0 register >>>>>> when work in host mode. >>>>>> After the root hub enter suspend, we can make controller enter >>>>>> low power state with PCGCTL register. >>>>>> >>>>>> We also update the lx_state for hsotg state. >>>>>> >>>>>> This patch has tested on rk3288 with suspend/resume. >>>>>> >>>>>> Signed-off-by: Kever Yang <kever.y...@rock-chips.com> >>>>>> Acked-by: Paul Zimmerman <pa...@synopsys.com> >>>>>> --- >>>>>> >>>>>> Changes in v3: >>>>>> - remove CONFIG_PM macro for bus_suspend/resume >>>>>> - add PCGCTL operation for no device connect case >>>>>> >>>>>> Changes in v2: >>>>>> - update commit message >>>>>> - make dwc2 suspend/resume sourcecode work >>>>>> >>>>>> drivers/usb/dwc2/hcd.c | 88 >>>>>> +++++++++++++++++++++++++++++++++++++++++++------- >>>>>> 1 file changed, 77 insertions(+), 11 deletions(-) >>>>> I would certainly appreciate confirmation, but my inclination is to >>>>> NAK this change due to the fact that it regresses functionality. I >>>>> haven't done any serious review of it, but I've been testing it and it >>>>> appears to break hotplug. >>>>> >>>>> Said another way, I did this: >>>>> >>>>> 1. Without this patch, I booted with a USB stick in. It was detected. >>>>> I unplugged it, waited 5 seconds, and then plugged it back in. The >>>>> USB stick was redetcted. >>>>> >>>>> 2. With this patch, I did the same thing. The USB not redected after >>>>> plugging it back in. >>>> With this patch, the dwc2 hcd/root hub will be auto suspend after device >>>> on port is disconnected, and it can't detect the device connect any more, >>>> I think that's the problem. >>>> >>>> I will figure out how to make dwc2 detect the device connect after auto >>>> suspend, >>>> or disable the auto suspend feature for the dwc2 hcd. >>> Kever, >>> >>> This patch has made it into Linus' kernel as commit 0cf884e819e0, and >>> it breaks disconnect/connect on at least the Altera SOCFPGA platform. >>> I haven't been able to test it on any other platforms. >>> >>> You need to submit a patch to either fix this, or to only enable this >>> feature for the Rock-chip platform. Otherwise the patch has to be >>> reverted. > > Unfortunately, after applying that patch there is another problem. If I > connect a device that causes an overcurrent condition to the root port, > then the port is dead after that. No further devices are detected until > after I reboot. > > I tried adding another call to usb_hcd_resume_root_hub() in the > "if (hprt0 & HPRT0_OVRCURRCHG)" branch, but then an overcurrent > condition causes a continuous stream of these messages: > > [ 133.348776] dwc2 ffb40000.usb: GetPortStatus wIndex=0x0001 flags=0x00000022 > [ 133.355717] dwc2 ffb40000.usb: Overcurrent change detected > [ 133.361179] dwc2 ffb40000.usb: HPRT0: 0x00020000 > [ 133.365960] dwc2 ffb40000.usb: port_status=00080000 > [ 133.373236] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000 > [ 133.380038] hub 1-0:1.0: hub_suspend > [ 133.384237] usb usb1: bus auto-suspend, wakeup 1 > [ 133.393631] dwc2 ffb40000.usb: DWC OTG HCD HUB STATUS DATA: Root port > status changed > [ 133.401341] dwc2 ffb40000.usb: port_connect_status_change: 0 > [ 133.407157] dwc2 ffb40000.usb: port_reset_change: 0 > [ 133.412186] dwc2 ffb40000.usb: port_enable_change: 0 > [ 133.417310] dwc2 ffb40000.usb: port_suspend_change: 0 > [ 133.422519] dwc2 ffb40000.usb: port_over_current_change: 1 > [ 133.428154] usb usb1: suspend raced with wakeup event > [ 133.433191] usb usb1: usb auto-resume > [ 133.441522] hub 1-0:1.0: hub_resume > [ 133.455505] dwc2 ffb40000.usb: GetPortStatus wIndex=0x0001 flags=0x00000022 > [ 133.462443] dwc2 ffb40000.usb: Overcurrent change detected > [ 133.467907] dwc2 ffb40000.usb: HPRT0: 0x00020000 > [ 133.472684] dwc2 ffb40000.usb: port_status=00080000 > [ 133.480088] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000 > [ 133.485578] hub 1-0:1.0: hub_suspend > [ 133.489157] usb usb1: bus auto-suspend, wakeup 1 > [ 133.493768] dwc2 ffb40000.usb: _dwc2_hcd_suspend() > [ 133.498540] dwc2 ffb40000.usb: DWC OTG HCD HUB STATUS DATA: Root port > status changed > [ 133.506257] dwc2 ffb40000.usb: port_connect_status_change: 0 > [ 133.512065] dwc2 ffb40000.usb: port_reset_change: 0 > [ 133.517102] dwc2 ffb40000.usb: port_enable_change: 0 > [ 133.522218] dwc2 ffb40000.usb: port_suspend_change: 0 > [ 133.527428] dwc2 ffb40000.usb: port_over_current_change: 1 > [ 133.533069] usb usb1: suspend raced with wakeup event > [ 133.538098] usb usb1: usb auto-resume > [ 133.546439] hub 1-0:1.0: hub_resume > > Any ideas? > Dinh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
