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Date:   Fri, 21 Apr 2023 20:03:37 +0100
From:   Daniel Golle <daniel@makrotopia.org>
To:     =?utf-8?B?QXLEsW7DpyDDnE5BTA==?= <arinc.unal@arinc9.com>
Cc:     Sean Wang <sean.wang@mediatek.com>,
        Landen Chao <Landen.Chao@mediatek.com>,
        DENG Qingfang <dqfext@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
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        Matthias Brugger <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Russell King <linux@armlinux.org.uk>,
        Richard van Schagen <richard@routerhints.com>,
        Richard van Schagen <vschagen@cs.com>,
        Frank Wunderlich <frank-w@public-files.de>,
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        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
Subject: Re: [RFC PATCH net-next 08/22] net: dsa: mt7530: change
 p{5,6}_interface to p{5,6}_configured
Message-ID: <ZELeCYZ0_eHTKFF_@makrotopia.org>
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On Fri, Apr 21, 2023 at 09:25:39PM +0300, Arınç ÜNAL wrote:
> 
> 
> On 21.04.2023 21:20, Arınç ÜNAL wrote:
> > On 21.04.2023 21:17, Arınç ÜNAL wrote:
> > > On 21.04.2023 20:28, Daniel Golle wrote:
> > > > On Fri, Apr 21, 2023 at 05:36:34PM +0300, arinc9.unal@gmail.com wrote:
> > > > > From: Arınç ÜNAL <arinc.unal@arinc9.com>
> > > > > 
> > > > > The idea of p5_interface and p6_interface pointers is to prevent
> > > > > mt753x_mac_config() from running twice for MT7531, as it's
> > > > > already run with
> > > > > mt753x_cpu_port_enable() from mt7531_setup_common(), if the
> > > > > port is used as
> > > > > a CPU port.
> > > > > 
> > > > > Change p5_interface and p6_interface to p5_configured and
> > > > > p6_configured.
> > > > > Make them boolean.
> > > > > 
> > > > > Do not set them for any other reason.
> > > > > 
> > > > > The priv->p5_intf_sel check is useless as in this code path,
> > > > > it will always
> > > > > be P5_INTF_SEL_GMAC5.
> > > > > 
> > > > > There was also no need to set priv->p5_interface and
> > > > > priv->p6_interface to
> > > > > PHY_INTERFACE_MODE_NA on mt7530_setup() and mt7531_setup()
> > > > > as they would
> > > > > already be set to that when "priv" is allocated. The
> > > > > pointers were of the
> > > > > phy_interface_t enumeration type, and the first element of the enum is
> > > > > PHY_INTERFACE_MODE_NA. There was nothing in between that
> > > > > would change this
> > > > > beforehand.
> > > > > 
> > > > > Tested-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> > > > > Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> > > > 
> > > > NACK. This assumes that a user port is configured exactly once.
> > > > However, interface mode may change because of mode-changing PHYs (e.g.
> > > > often using Cisco SGMII for 10M/100M/1000M but using 2500Base-X for
> > > > 2500M, ie. depending on actual link speed).
> > > > 
> > > > Also when using SFP modules (which can be hotplugged) the interface
> > > > mode may change after initially setting up the driver, e.g. when SFP
> > > > driver is loaded or a module is plugged or replaced.
> > > 
> > > I'm not sure I understand. pX_configured would be set to true only
> > > when the port is used as a CPU port. mt753x_mac_config() should run
> > > for user or DSA ports more than once, if needed.
> > 
> > Looking at this again, once pX_interface is true, the check will prevent
> > even user or DSA ports to be configured again. What about setting
> > pX_interface to false after mt753x_mac_config() is run?
> 
> On a third thought, pX_interface will never be true for the port if it's a
> user or DSA port so this should not be a problem at all.

I also followed the individual codepaths and conclude that you are
right. I've also tested this by now on several boards with MT753x,
incl. BPi-R3 and SerDes interface mode switching is anyway handled in
the PCS driver (I should have rembered that...)

Hence
Acked-by: Daniel Golle <daniel@makrotopia.org>

> 
> Arınç