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

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Message-ID: <3334755.enVybYgnYb@phil>
Date:	Thu, 29 Oct 2015 23:49:48 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Douglas Anderson <dianders@...omium.org>
Cc:	John Youn <John.Youn@...opsys.com>, balbi@...com,
	wulf@...k-chips.com, lyz@...k-chips.com,
	linux-rockchip@...ts.infradead.org,
	Julius Werner <jwerner@...omium.org>,
	gregory.herrero@...el.com, yousaf.kaukab@...el.com,
	r.baldyga@...sung.com, dinguyen@...nsource.altera.com,
	johnyoun@...opsys.com, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: dwc2: host: Fix remote wakeup when not in DWC2_L2

Am Donnerstag, 22. Oktober 2015, 13:05:03 schrieb Douglas Anderson:
> 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>

I've talked with Doug a lot about that problem today and from reading
this change and the referenced causing change, it looks correct
and good to me, so

Reviewed-by: Heiko Stuebner <heiko@...ech..de>


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