linux-kernel - Re: [PATCH v2] USB: ehci-s5p: Fix phy reset

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Date:	Wed, 13 Mar 2013 20:38:47 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Alexander Graf <agraf@...e.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	dmueller@...e.de, Vivek Gautam <gautam.vivek@...sung.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] USB: ehci-s5p: Fix phy reset

Alexander,

On Wed, Mar 13, 2013 at 4:59 PM, Alexander Graf <agraf@...e.de> wrote:
> On my Exynos 5 based Arndale system, I need to pull the reset line down
> and then let it go up again to actually perform a reset. Without that
> reset, I can't find any USB hubs on my bus, rendering the USB controller
> useless.
>
> We also only need to reset the line after the phy node has been found.
> This way we don't accidently reserve the vbus GPIO pin, but later on
> defer the creation of our controller, because the phy device tree node
> hasn't been probed yet.
>
> This patch implements the above logic, making EHCI and OHCI work on
> Arndale systems for me.
>
> Signed-off-by: Alexander Graf <agraf@...e.de>
> CC: Vivek Gautam <gautam.vivek@...sung.com>
> CC: Jingoo Han <jg1.han@...sung.com>
> CC: Alan Stern <stern@...land.harvard.edu>
> CC: Kukjin Kim <kgene.kim@...sung.com>
> CC: Felipe Balbi <balbi@...com>
> CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> CC: Doug Anderson <dianders@...omium.org>
>
> ---
>
> v1 -> v2:
>
>   - remove gpio_free call
>   - move reset logic after phy node search

Seems fine to me.  I guess the earlier problem you wrote about was the
probe failure, then?  I think that the reason I don't tend to get the
probe failure is that I've got my device tree ordered differently so
that the phy gets initted in a different order.

I'll send up the devm_ patch atop this.

Reviewed-by: Doug Anderson <dianders@...omium.org>

Thanks!  :)

-Doug
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