linux-kernel - Re: [PATCH v2] ARM: tegra: fix ulpi regression on tegra20

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Message-ID: <20180308145914.GA13814@ulmo>
Date:   Thu, 8 Mar 2018 15:59:14 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Marcel Ziswiler <marcel.ziswiler@...adex.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "digetx@...il.com" <digetx@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: tegra: fix ulpi regression on tegra20

On Thu, Mar 08, 2018 at 02:31:26PM +0000, Marcel Ziswiler wrote:
> On Thu, 2018-03-08 at 15:15 +0100, Thierry Reding wrote:
> > On Thu, Feb 22, 2018 at 03:38:25PM +0100, Marcel Ziswiler wrote:
> > > From: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> > > 
> > > Since commit f8f8f1d04494 ("clk: Don't touch hardware when
> > > reparenting
> > > during registration") ULPI has been broken on Tegra20 leading to
> > > the
> > > following error message during boot:
> > > 
> > > [    1.974698] ulpi_phy_power_on: ulpi write failed
> > > [    1.979384] tegra-ehci c5004000.usb: Failed to power on the phy
> > > [    1.985434] tegra-ehci: probe of c5004000.usb failed with error
> > > -110
> > > 
> > > Debugging through the changes and finally also consulting the TRM
> > > revealed that rather than the CDEV2 clock off OSC requiring such
> > > pin
> > > muxing actually the PLL_P_OUT4 clock is in use. It looks like so
> > > far it
> > > just worked by chance of that one having been enabled which
> > > Stephen's
> > > commit now changed when reparenting sclk away from pll_p_out4
> > > leaving
> > > that one disabled. Fix this by properly assigning the PLL_P_OUT4
> > > clock
> > > as the ULPI PHY clock.
> > > 
> > > Signed-off-by: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> > > 
> > > ---
> > > 
> > > Changes in v2:
> > > - Updated device tree binding documentation as well.
> > > - CCing Dmitry as well.
> > > 
> > >  Documentation/devicetree/bindings/phy/nvidia,tegra20-usb-phy.txt |
> > > 4 +++-
> > >  arch/arm/boot/dts/tegra20.dtsi                                   |
> > > 2 +-
> > >  2 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > Applied, though I've split this into two separate patches, one going
> > into for-4.17/dt-bindings and the other going into for-4.17/arm/dt.
> 
> Thanks, Thierry!
> 
> BTW: Do you know what is happening with my T30 USB patch? Is there
> anything I may do about it?

I just took care of that.

Thierry

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