From: Stephen Boyd <stephen.boyd@linaro.org>
To: Peter Chen <hzpeterchen@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
linux-pm@vger.kernel.org,
Javier Martinez Canillas <javier@osg.samsung.com>,
Kukjin Kim <kgene@kernel.org>,
Alan Stern <stern@rowland.harvard.edu>,
devicetree@vger.kernel.org, Pawel Moll <pawel.moll@arm.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-mmc@vger.kernel.org,
Sebastian Reichel <sre@kernel.org>,
Kumar Gala <galak@codeaurora.org>,
David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree
Date: Thu, 02 Jun 2016 16:59:55 -0700 [thread overview]
Message-ID: <146491199510.7580.5649614149557346848@sboyd-linaro> (raw)
In-Reply-To: <20160602012419.GA7953@shlinux2>
Quoting Peter Chen (2016-06-01 18:24:19)
> On Wed, Jun 01, 2016 at 11:16:34AM -0700, Stephen Boyd wrote:
> > >
> > > No, you may need to do reset before enumeration, the general purpose of
> > > reset is eliminate unstable hardware state, and let the controller find
> > > the device.
> > >
> > > Try to do it at bootloader to see if it works for you.
> > >
> >
> > Sorry the bootloader doesn't do this so that doesn't work for me.
>
> I mean try to see if the HUB can work if you reset it at bootloader.
> If it works, it means you need to do reset before enumeration, and you
> don't need to do anything after enumeration.
>
Ah ok. Yes, I need to deassert the reset before enumeration. Right now I
have a driver for the 4604 hub controller that deasserts a reset gpio
and sends an i2c command to put the controller into "hub" mode. If I do
this before the usb controller driver probes then everything works. If I
do it after the controller probes it doesn't.
next prev parent reply other threads:[~2016-06-02 23:59 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 8:02 [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 01/12] power/mmc: Move pwrseq drivers to power/pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 02/12] MAINTAINERS: Retain Ulf Hansson as the same maintainer of pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 03/12] power: pwrseq: Enable COMPILE_TEST for drivers Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 04/12] power: pwrseq: Remove mmc prefix from mmc_pwrseq Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 05/12] power: pwrseq: Generalize mmc_pwrseq operations by removing mmc prefix Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 06/12] power: pwrseq: simple: Add support for regulator and generic property Krzysztof Kozlowski
2016-06-03 2:02 ` Rob Herring
2016-06-03 12:35 ` Krzysztof Kozlowski
2016-06-06 3:22 ` Peter Chen
2016-06-07 9:29 ` Krzysztof Kozlowski
2016-06-08 19:03 ` Rob Herring
2016-06-09 2:34 ` Chen-Yu Tsai
[not found] ` <CAGb2v66OO0QJ75=hLnRukhXWdX7HgSy0LDakdZ_jxFRCHTUuJw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-09 5:11 ` Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 07/12] power: pwrseq: Add support for USB hubs with external power Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 08/12] usb: hub: Handle deferred probe Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 09/12] EXAMPLE CODE: usb: port: Parse pwrseq phandle from Device Tree Krzysztof Kozlowski
[not found] ` <1464768141-25420-10-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2016-06-01 8:57 ` Stephen Boyd
2016-06-01 9:06 ` Krzysztof Kozlowski
2016-06-01 12:05 ` Peter Chen
2016-06-01 18:16 ` Stephen Boyd
2016-06-02 1:24 ` Peter Chen
2016-06-02 23:59 ` Stephen Boyd [this message]
2016-06-01 8:02 ` [PATCH v3 10/12] EXAMPLE CODE: usb: hub: Power sequence the ports on activation Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 11/12] ARM: dts: exynos: Switch the buck8 to GPIO mode on Odroid U3 Krzysztof Kozlowski
2016-06-01 8:02 ` [PATCH v3 12/12] ARM: dts: exynos: Fix LAN and HUB after bootloader initialization " Krzysztof Kozlowski
2016-06-01 11:59 ` Peter Chen
2016-06-02 7:26 ` Krzysztof Kozlowski
2016-06-02 7:58 ` Peter Chen
2016-06-06 20:43 ` [PATCH v3 00/12] usb/mmc/power: Generic power sequence (and fix USB/LAN when TFTP booting) Heiko Stübner
2016-06-07 6:03 ` Krzysztof Kozlowski
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