linux-kernel - Re: [PATCH v4 10/13] phy: usb: PHY's MDIO registers not accessible without device installed

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Date:   Fri, 3 Jan 2020 10:27:25 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Al Cooper <alcooperx@...il.com>, linux-kernel@...r.kernel.org
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Srinath Mannam <srinath.mannam@...adcom.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 10/13] phy: usb: PHY's MDIO registers not accessible
 without device installed

On 1/3/20 10:18 AM, Al Cooper wrote:
> When there is no device connected and FSM is enabled, the XHCI puts
> the PHY into suspend mode.  When the PHY is put into suspend mode
> the USB LDO powers down the PHY. This causes the MDIO to be
> inaccessible and its registers reset to default. The fix is to
> disable FSM.
> 
> Signed-off-by: Al Cooper <alcooperx@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian