linux-kernel - Re: [PATCH v2 4/7] net: phy: realtek: Enable accessing RTL8211E extension pages

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Message-ID: <20190703225648.GK250418@google.com>
Date:   Wed, 3 Jul 2019 15:56:48 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 4/7] net: phy: realtek: Enable accessing RTL8211E
 extension pages

On Wed, Jul 03, 2019 at 11:27:41PM +0200, Heiner Kallweit wrote:
> On 03.07.2019 23:24, Matthias Kaehlcke wrote:
> > On Wed, Jul 03, 2019 at 11:01:09PM +0200, Heiner Kallweit wrote:
> >> On 03.07.2019 22:36, Matthias Kaehlcke wrote:
> >>> On Wed, Jul 03, 2019 at 10:12:12PM +0200, Heiner Kallweit wrote:
> >>>> On 03.07.2019 21:37, Matthias Kaehlcke wrote:
> >>>>> The RTL8211E has extension pages, which can be accessed after
> >>>>> selecting a page through a custom method. Add a function to
> >>>>> modify bits in a register of an extension page and a helper for
> >>>>> selecting an ext page.
> >>>>>
> >>>>> rtl8211e_modify_ext_paged() is inspired by its counterpart
> >>>>> phy_modify_paged().
> >>>>>
> >>>>> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> >>>>> ---
> >>>>> Changes in v2:
> >>>>> - assign .read/write_page handlers for RTL8211E
> >>>>
> >>>> Maybe this was planned, but it's not part of the patch.
> >>>
> >>> Oops, it was definitely there when I tested ... I guess this got
> >>> somehow lost when changing the patch order and resolving minor
> >>> conflicts, seems like I only build tested after that :/
> >>>
> >> RTL8211E also supports normal pages (reg 0x1f = page).
> >> See e.g. rtl8168e_2_hw_phy_config in the r8169 driver, this network
> >> chip has an integrated RTL8211E PHY. There settings on page 3 and 5
> >> are done.
> >> Therefore I would prefer to use .read/write_page for normal paging
> >> in all Realtek PHY drivers. Means the code here would remain as it
> >> is and just the changelog would need to be fixed.
> > 
> > Do I understand correctly that you suggest an additional patch that
> > assigns .read/write_page() for all entries of realtek_drvs?
> > 
> 
> No, basically all the Realtek PHY drivers use the following already:
> .read_page	= rtl821x_read_page,
> .write_page	= rtl821x_write_page,
> What I mean is that this should stay as it is, and not be overwritten
> with the extended paging.

I now see the source of our/my misunderstanding. I'm working on a 4.19
kernel, which doesn't have your recent patch:

commit daf3ddbe11a2ff74c95bc814df8e5fe3201b4cb5
Author: Heiner Kallweit <hkallweit1@...il.com>
Date:   Fri May 10 22:11:26 2019 +0200

    net: phy: realtek: add missing page operations


That's what I intended to do for RTL8211E, no need to overwrite it
with the extended paging.

Thanks

Matthias