linux-kernel - Re: [PATCH net] net: phy: broadcom: Fix bcm_write

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Message-ID: <89a1f8d7-5303-f3c0-aa38-43e64488ec5a@gmail.com>
Date:   Tue, 22 May 2018 18:20:41 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, arunp@...adcom.com,
        "David S. Miller" <davem@...emloft.net>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        "maintainer:BROADCOM IPROC ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM IPROC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: phy: broadcom: Fix bcm_write_exp()

Hi Andrew,

On 05/22/2018 05:15 PM, Andrew Lunn wrote:
> On Tue, May 22, 2018 at 05:04:49PM -0700, Florian Fainelli wrote:
>> On newer PHYs, we need to select the expansion register to write with
>> setting bits [11:8] to 0xf. This was done correctly by bcm7xxx.c prior
>> to being migrated to generic code under bcm-phy-lib.c which
>> unfortunately used the older implementation from the BCM54xx days.
> 
> Hi Florian
> 
> Does selecting the expansion register affect access to the standard
> registers? Does this need locking like the Marvell PHY has when
> changing pages?

We should probably convert this to the page accessors since the
expansion, misc and other shadow 0x1c accesses are all indirection
layers to poke into a different address space of the PHY. That would be
a separate fix though for a number of reasons.
-- 
Florian