linux-kernel - Re: [Query]usb: dwc2: suspend/resume support for DWC2_POWER_DOWN_PARAM

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Date:   Tue, 16 Jun 2020 13:53:37 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Query]usb: dwc2: suspend/resume support for
 DWC2_POWER_DOWN_PARAM_NONE case

Hi Jisheng,

On 6/16/2020 1:03 PM, Jisheng Zhang wrote:
> Hi,
> 
> After reading current dwc2 code, I got an impression that resume from suspend
> to ram isn't supported for DWC2_POWER_DOWN_PARAM_NONE case, right? In fact
'ram' Do you mean on suspend save registers in RAM?
If yes, then in case when power_down is _NONE then no any register 
saving/restoring to/from RAM should be performing.
> we do see usb device can't resume properly with DWC2_POWER_DOWN_PARAM_NONE case.
> 
If you see any issue on resume in mentioned case then more probably is 
some another issue which can debugged.

> If the impression is true, what's the proper technical direction? Add
> dwc2_host_enter_suspend() as dwc2_host_enter_hibernation()
> and
> dwc2_host_exit_suspend() as dwc2_host_exit_hibernation()?
> 
> Thanks in advance,
> Jisheng
> 
Thanks,
Minas