linux-kernel - Re: [PATCH 0/4] Patches to fix remote wakeup on rk3288 dwc2 "host" port

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Date:	Sat, 24 Oct 2015 10:10:23 -0500
From:	Rob Herring <robh@...nel.org>
To:	Douglas Anderson <dianders@...omium.org>
Cc:	heiko@...ech.de, kishon@...com, johnyoun@...opsys.com,
	balbi@...com, gregkh@...uxfoundation.org, lyz@...k-chips.com,
	wulf@...k-chips.com, mark.rutland@....com,
	devicetree@...r.kernel.org, linux@....linux.org.uk,
	pawel.moll@....com, ijc+devicetree@...lion.org.uk,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, robh+dt@...nel.org,
	galak@...eaurora.org, gregory.herrero@...el.com,
	paulz@...opsys.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/4] Patches to fix remote wakeup on rk3288 dwc2 "host"
 port

On 10/23/2015 01:28 PM, Douglas Anderson wrote:
> The "host1" port (AKA the dwc2 port that isn't the OTG port) on rk3288
> has a hardware errata that causes everything to get confused when we get
> a remote wakeup.  It appears that the "port reset" bit that's in the USB
> phy (located in the rk3288 GRF) fixes things up and appears safe to do.
> 
> This series of patches exports the "port reset" from the PHY and then
> hooks it up to dwc2 through a quirk.
> 
> I've tested this series atop a bit of a conglomeration of Heiko's github
> "somewhat stable" branch (v4.3-rc3-876-g6509232) but with Greg KH's
> usb-next merged in.
> 
> These patches currently conflict with patches that I posted previously
> to enable USB wakeup from S3, specifically:
> * https://patchwork.kernel.org/patch/6727081/
> * https://patchwork.kernel.org/patch/6727121/
> ...those patches no longer apply anyway, so presumably they need to be
> reposted and I can do so later atop these patches.
> 
> 
> Douglas Anderson (4):
>   phy: rockchip-usb: Support the PHY's "port reset"
>   usb: dwc2: optionally assert phy "port reset" when waking up
>   ARM: dts: rockchip: Enable the USB phys as reset providers on rk3288
>   ARM: dts: rockchip: Point rk3288 dwc2 usb at phy port reset
> 
>  .../devicetree/bindings/phy/rockchip-usb-phy.txt   |  6 ++
>  Documentation/devicetree/bindings/usb/dwc2.txt     |  7 ++
>  arch/arm/boot/dts/rk3288.dtsi                      |  8 +++
>  drivers/phy/phy-rockchip-usb.c                     | 74 ++++++++++++++++++++++
>  drivers/usb/dwc2/core.h                            |  5 ++
>  drivers/usb/dwc2/core_intr.c                       |  7 ++
>  drivers/usb/dwc2/platform.c                        | 13 ++++
>  7 files changed, 120 insertions(+)

A DT reset controller seems like a bit of an overkill here. I think this
would be much more simple if we just add a phy reset hook to the phy
subsystem.

Rob

> 

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