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 21:59:03 +0800
From: Jie Luo <quic_luoj@...cinc.com>
To: Christian Marangi <ansuelsmth@...il.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>
CC: 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 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.

> 
> 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.
>