linux-kernel - Re: [PATCH v3] usb: dwc2: add bus suspend/resume for dwc2

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Date:	Wed, 12 Nov 2014 15:22:25 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Kever Yang <kever.yang@...k-chips.com>
Cc:	Paul Zimmerman <paulz@...opsys.com>, Felipe Balbi <balbi@...com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	romain.perier@...il.com, Heiko Stuebner <heiko@...ech.de>,
	Sonny Rao <sonnyrao@...omium.org>,
	Addy Ke <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, lyz <lyz@...k-chips.com>,
	wulf <wulf@...k-chips.com>, Tao Huang <huangtao@...k-chips.com>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	jwerner@...omium.org
Subject: Re: [PATCH v3] usb: dwc2: add bus suspend/resume for dwc2

Kever,

On Mon, Nov 10, 2014 at 5:09 AM, Kever Yang <kever.yang@...k-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.yang@...k-chips.com>
> Acked-by: Paul Zimmerman <paulz@...opsys.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.

-Doug
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