linux-kernel - Re: [PATCH] usb: dwc2: host: Fix remote wakeup when not in DWC2

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Message-ID: <2B3535C5ECE8B5419E3ECBE30077290901DC3B0E98@US01WEMBX2.internal.synopsys.com>
Date:	Fri, 30 Oct 2015 03:21:29 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	Doug Anderson <dianders@...omium.org>,
	John Youn <John.Youn@...opsys.com>, Felipe Balbi <balbi@...com>
CC:	wulf <wulf@...k-chips.com>, lyz <lyz@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Julius Werner <jwerner@...omium.org>,
	"Herrero, Gregory" <gregory.herrero@...el.com>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	"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>,
	"Kaukab, Yousaf" <yousaf.kaukab@...el.com>
Subject: Re: [PATCH] usb: dwc2: host: Fix remote wakeup when not in DWC2_L2

On 10/29/2015 9:43 AM, Doug Anderson wrote:
> John,
> 
> On Thu, Oct 22, 2015 at 1:05 PM, Douglas Anderson <dianders@...omium.org> wrote:
>> In commit 734643dfbdde ("usb: dwc2: host: add flag to reflect bus
>> state") we changed dwc2_port_suspend() not to set the lx_state
>> anymore (instead it sets the new bus_suspended variable).  This
>> introduced a bug where we would fail to detect device insertions if:
>>
>> 1. Plug empty hub into dwc2
>> 2. Plug USB flash drive into the empty hub.
>> 3. Wait a few seconds
>> 4. Unplug USB flash drive
>> 5. Less than 2 seconds after step 4, plug the USB flash drive in again.
>>
>> The dwc2_hcd_rem_wakeup() function should have been changed to look at
>> the new bus_suspended variable.
>>
>> Let's fix it.  Since commit b46146d59fda ("usb: dwc2: host: resume root
>> hub on remote wakeup") talks about needing the root hub resumed if the
>> bus was suspended, we'll include it in our test.
>>
>> It appears that the "port_l1_change" should only be set to 1 if we were
>> in DWC2_L1 (the driver currently never sets this), so we'll update the
>> former "else" case based on this test.
>>
>> Fixes: 734643dfbdde ("usb: dwc2: host: add flag to reflect bus state")
>> Signed-off-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>  drivers/usb/dwc2/hcd.c | 9 +++++----
>>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> I know I've sent up a lot of patches recently, but this one in
> particular would be good to get tested, reviewed, and landed sooner
> rather than later.  I believe it fixes a recent regression that is
> probably experienced across all dwc2 users.
> 
> Please let me know if you have any questions.


Acked-by: John Youn <johnyoun@...opsys.com>

Sorry for the delay. I'll get to the others soon.


Yousaf, Gregory,

Care to provide reviewed or tested-bys?

Regards,
John

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