netdev - Re: [RFC PATCH net-next v4 01/28] net: mdio: ipq8064: clean whitespaces in define

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Message-ID: <YKAQ+BggTCzc7aZW@Ansuel-xps.localdomain>
Date:   Sat, 15 May 2021 20:20:40 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Jonathan McDowell <noodles@...th.li>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v4 01/28] net: mdio: ipq8064: clean
 whitespaces in define

On Sat, May 15, 2021 at 07:08:57PM +0100, Jonathan McDowell wrote:
> On Sat, May 15, 2021 at 07:30:26PM +0200, Ansuel Smith wrote:
> > On Sat, May 15, 2021 at 06:00:46PM +0100, Jonathan McDowell wrote:
> > > On Sat, May 08, 2021 at 08:05:58PM +0200, Ansuel Smith wrote:
> > > > On Sat, May 08, 2021 at 08:02:33PM +0200, Andrew Lunn wrote:
> > > > > On Sat, May 08, 2021 at 02:28:51AM +0200, Ansuel Smith wrote:
> > > > > > Fix mixed whitespace and tab for define spacing.
> > > > > 
> > > > > Please add a patch [0/28] which describes the big picture of what
> > > > > these changes are doing.
> > > > > 
> > > > > Also, this series is getting big. You might want to split it into two,
> > > > > One containing the cleanup, and the second adding support for the new
> > > > > switch.
> > > > > 
> > > > > 	Andrew
> > > > 
> > > > There is a 0/28. With all the changes. Could be that I messed the cc?
> > > > I agree think it's better to split this for the mdio part, the cleanup
> > > > and the changes needed for the internal phy.
> > > 
> > > FWIW I didn't see the 0/28 mail either. I tried these out on my RB3011
> > > today. I currently use the GPIO MDIO driver because I saw issues with
> > > the IPQ8064 driver in the past, and sticking with the GPIO driver I see
> > > both QCA8337 devices and traffic flows as expected, so no obvious
> > > regressions from your changes.
> > > 
> > > I also tried switching to the IPQ8064 MDIO driver for my first device
> > > (which is on the MDIO0 bus), but it's still not happy:
> > > 
> > > qca8k 37000000.mdio-mii:10: Switch id detected 0 but expected 13
> > > 
> > 
> > Can you try the v6 version of this series?
> 
> Both the v6 qca8k series and the separate ipq806x mdio series, yes?
> 
> > Anyway the fact that 0 is produced instead of a wrong value let me
> > think that there is some problem with the mdio read. (on other device
> > there was a problem of wrong id read but nerver 0). Could be that the
> > bootloader on your board set the mdio MASTER disabled. I experienced
> > this kind of problem when switching from the dsa driver and the legacy
> > swconfig driver. On remove of the dsa driver, the swconfig didn't work
> > as the bit was never cleared by the dsa driver and resulted in your
> > case. (id 0 read from the mdio)
> > 
> > Do you want to try a quick patch so we can check if this is the case?
> > (about the cover letter... sorry will check why i'm pushing this
> > wrong)
> 
> There's definitely something odd going on here. I went back to mainline
> to see what the situation is there. With the GPIO MDIO driver both
> switches work (expected, as this is what I run with). I changed switch0
> over to use the IPQ MDIO driver and it wasn't detected (but switch1
> still on the GPIO MDIO driver was fine).
> 
> I then tried putting both switches onto the IPQ MDIO driver and in that
> instance switch0 came up fine, while switch1 wasn't detected.
> 

Oh wait, your board have 2 different switch? So they both use the master
bit when used... Mhhh I need to think about this if there is a clean way
to handle this. The idea would be that one of the 2 dsa switch should
use the already defined mdio bus.

The problem here is that to use the internal mdio bus, a bit must be
set or 0 is read on every value (as the bit actually disable the internal
mdio). This is good if one dsa driver is used but when 2 or more are
used I think this clash and only one of them work. The gpio mdio path is
not affected by this. Will check if I can find some way to address this.

> If there's a simple patch that might give more debug I can try it out.
> 
> J.
>
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