linux-kernel - Re: [net-next PATCH 0/3] net: mdio-ipq4019: fix wrong default MDC rate

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Date: Mon, 29 Jan 2024 15:25:09 +0100
From: Christian Marangi <ansuelsmth@...il.com>
To: Jie Luo <quic_luoj@...cinc.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Andrew Lunn <andrew@...n.ch>, Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Robert Marko <robert.marko@...tura.hr>,
	linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sergey Ryazanov <ryazanov.s.a@...il.com>
Subject: Re: [net-next PATCH 0/3] net: mdio-ipq4019: fix wrong default MDC
 rate

On Mon, Jan 29, 2024 at 09:59:03PM +0800, Jie Luo wrote:
> 
> 
> On 1/27/2024 1:33 AM, Christian Marangi wrote:
> > On Fri, Jan 26, 2024 at 07:20:03PM +0200, Dmitry Baryshkov wrote:
> > > On Fri, 26 Jan 2024 at 18:03, Jie Luo <quic_luoj@...cinc.com> wrote:
> > > > 
> > > > 
> > > > 
> > > > On 1/26/2024 1:18 AM, Andrew Lunn wrote:
> > > > > > Hi Christian,
> > > > > > Just a gentle reminder.
> > > > > > 
> > > > > > The MDIO frequency config is already added by the following patch series.
> > > > > > https://lore.kernel.org/netdev/28c8b31c-8dcb-4a19-9084-22c77a74b9a1@linaro.org/T/#m840cb8d269dca133c3ad3da3d112c63382ec2058
> > > > > 
> > > > > I admit this version was posted first. However, its embedded in a
> > > > > patch series which is not making much progress, and i doubt will make
> > > > > progress any time soon.
> > > > > 
> > > > > If you really want your version to be used, please split it out into a
> > > > > standalone patch series adding just MDIO clock-frequency support, with
> > > > > its binding, and nothing else.
> > > > > 
> > > > >       Andrew
> > > > 
> > > > Hi Andrew,
> > > > We will rework the patch series to include only MDIO frequency related
> > > > function and frequency dt binding, and post the updated patch series
> > > > on th/Tuesdae Mondayy of next week. We will work with Christian to
> > > > ensure he can re-use this patch as well.
> > > 
> > > Can you do the other way around: rebase your patches on top of Chritian's work?
> 
> Hi Dmitry,
> Sure, we can take this approach if fine by Andrew as well.
> 
> > > 
> > 
> > Would be ideal, also I have to send v2 that handle the 802.3 suggested
> > MDC rate (ready I just need to send after this has been handled).
> > 
> > Also I can see some problem with Lui patch where thse divior
> > value is not reapplied after MDIO reset effectively reverting to the
> > default value.
> 
> Hi Christian,
> In my version, the divisor is programmed in every MDIO operation and hence I
> did not add the code to revert to configured value in reset function. But
> sure. we can program it once during the probe/reset and avoid doing it
> during read/write ops.
> 
> In addition, the MDIO divisor 1, 2 and 4 are not supported by the MDIO
> hardware block, maybe we can remove these macros to avoid confusion, or add
> a comment mentioning that these are not supported.
>

Hi, thanks for confirming it! In v2 I already changed the logic to start
looping from divisor 8 and added comments in DT and driver about not
assuring correct funcionality with those divisor.

> > 
> > If it's a credits problem I can totally change the from or add
> > Co-devloped, I just need the feature since the thing is broken from a
> > looong time on ipq40xx and ipq807x.
> > 

-- 
	Ansuel