linux-kernel - Re: [PATCH 1/4] phy: sun4i-usb: support PHY0 on H3 in MUSB mode

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Message-ID: <20170117200658.gcrcxeanthdtwg26@lukather>
Date:   Tue, 17 Jan 2017 21:06:58 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bin Liu <b-liu@...com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 1/4] phy: sun4i-usb: support PHY0 on H3 in MUSB mode

On Wed, Jan 18, 2017 at 12:57:08AM +0800, Icenowy Zheng wrote:
> 
> 
> 17.01.2017, 16:06, "Maxime Ripard" <maxime.ripard@...e-electrons.com>:
> > On Tue, Jan 17, 2017 at 03:14:46AM +0800, Icenowy Zheng wrote:
> >>  The PHY0 on H3 can be wired either to MUSB controller or OHCI/EHCI
> >>  controller.
> >>
> >>  The original driver wired it to OHCI/EHCI controller; however, as the
> >>  code to use PHY0 as OHCI/EHCI is missing, it makes the PHY fully
> >>  unusable.
> >>
> >>  Rename the register (according to its function and the name in BSP
> >>  driver), and remove the code which wires the PHY0 to OHCI/EHCI, as MUSB
> >>  can support both peripheral and host mode (although the host mode of
> >>  MUSB is buggy).
> >
> > Can you elaborate on that? What's wrong with it?
> 
> The configuration is at bit 0 of register 0x20 in PHY.
> 
> When the PHY is reseted, it defaults as MUSB mode.
> 
> However, the original author of the H3 PHY code seems to be lack of
> this knowledge (He named it PHY_UNK_H3), and changed the PHY to HCI
> mode.
> 
> I just removed the code that wires it to HCI mode, thus it will work
> in MUSB mode, with my sun8i-h3-musb patch.

I have no idea what you mean by MUSB mode.

Do you mean that the previous code was only working in host mode, and
now it only works in peripheral?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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