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/
Thanks,
- Kever
On 01/06/2015 09:23 AM, Paul Zimmerman wrote:
From: Kever Yang [mailto:kever.yang@xxxxxxxxxxxxxx]
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.yang@xxxxxxxxxxxxxx> 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.yang@xxxxxxxxxxxxxx>
Acked-by: Paul Zimmerman <paulz@xxxxxxxxxxxx>
---
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.
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