linux-kernel - Re: [Linux-stm32] [PATCH] net: stmmac: platform: Fix MDIO init for platforms without PHY

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Message-ID: <c1af466d-0870-364f-1bff-0ac015811e60@st.com>
Date:   Tue, 7 Jan 2020 13:28:57 +0000
From:   Patrice CHOTARD <patrice.chotard@...com>
To:     Sriram Dash <sriram.dash@...sung.com>,
        'Heiko Stübner' <heiko@...ech.de>,
        'Florian Fainelli' <f.fainelli@...il.com>,
        'David Miller' <davem@...emloft.net>
CC:     "Jose.Abreu@...opsys.com" <Jose.Abreu@...opsys.com>,
        "jayati.sahu@...sung.com" <jayati.sahu@...sung.com>,
        "rcsekar@...sung.com" <rcsekar@...sung.com>,
        "pankaj.dubey@...sung.com" <pankaj.dubey@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "p.rajanbabu@...sung.com" <p.rajanbabu@...sung.com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Peppe CAVALLARO <peppe.cavallaro@...com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Linux-stm32] [PATCH] net: stmmac: platform: Fix MDIO init for
 platforms without PHY

On 1/7/20 2:15 PM, Patrice CHOTARD wrote:
> Hi All
>
> On 1/7/20 6:34 AM, Sriram Dash wrote:
>>> From: Heiko Stübner <heiko@...ech.de>
>>> Subject: Re: [PATCH] net: stmmac: platform: Fix MDIO init for platforms
>> without
>>> PHY
>>>
>>> Hi Florian,
>>>
>>> Am Sonntag, 5. Januar 2020, 23:22:00 CET schrieb Florian Fainelli:
>>>> On 1/5/2020 12:43 PM, Heiko Stübner wrote:
>>>>> Am Samstag, 21. Dezember 2019, 06:29:18 CET schrieb David Miller:
>>>>>> From: Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>
>>>>>> Date: Thu, 19 Dec 2019 15:47:01 +0530
>>>>>>
>>>>>>> The current implementation of "stmmac_dt_phy" function initializes
>>>>>>> the MDIO platform bus data, even in the absence of PHY. This fix
>>>>>>> will skip MDIO initialization if there is no PHY present.
>>>>>>>
>>>>>>> Fixes: 7437127 ("net: stmmac: Convert to phylink and remove phylib
>>>>>>> logic")
>>>>>>> Acked-by: Jayati Sahu <jayati.sahu@...sung.com>
>>>>>>> Signed-off-by: Sriram Dash <sriram.dash@...sung.com>
>>>>>>> Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>
>>>>>> Applied and queued up for -stable, thanks.
>>>>> with this patch applied I now run into issues on multiple rockchip
>>>>> platforms using a gmac interface.
>>>> Do you have a list of DTS files that are affected by any chance? For
>>>> the 32-bit platforms that I looked it, it seems like:
>>>>
>> Hi Florian, 
>> We have listed down the platforms which will break for as they don't have
>> the mdio / snps,dwmac-mdio node.
>> Arm32 spear* , Arm32 ox820*, arm32 rv1108, arc abilis* , arc axs10x*, arc
>> vdk_axs10x*, mips pistachio, arm64 rockchip/px30* There might be more
>> platforms.
> STiH410-B2260 is affected by this patch, i proposed a fix for this board :
>
> https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=224639
>
> David, will you applied this DT series in your tree ?

I just noticed that a fix has been proposed[1] and fixes the issue on STiH410-B2260

without the DT series i just proposed above.

So don't take care of my previous email.

Thanks

Patrice

[1] https://lkml.org/lkml/2020/1/7/405

>
> Thanks
>
> Patrice
>
>
>>>> arch/arm/boot/dts/rk3228-evb.dts is OK because it has a MDIO bus node
>>>> arch/arm/boot/dts/rk3229-xms6.dts is also OK
>>>>
>>>> arch/arm/boot/dts/rk3229-evb.dts is probably broken, there is no
>>>> phy-handle property or MDIO bus node, so it must be relying on
>>>> auto-scanning of the bus somehow that this patch broke.
>>>>
>>>> And likewise for most 64-bit platforms except a1 and nanopi4.
>>> I primarily noticed that on the px30-evb.dts and the internal board I'm
>> working
>>> on right now. Both don't have that mdio bus node right now.
>>>
>>>
>>>>> When probing the driver and trying to establish a connection for a
>>>>> nfsroot it always runs into a null pointer in mdiobus_get_phy():
>>>>>
>>>>> [   26.878839] rk_gmac-dwmac ff360000.ethernet: IRQ eth_wake_irq not
>>> found
>>>>> [   26.886322] rk_gmac-dwmac ff360000.ethernet: IRQ eth_lpi not found
>>>>> [   26.894505] rk_gmac-dwmac ff360000.ethernet: PTP uses main clock
>>>>> [   26.908209] rk_gmac-dwmac ff360000.ethernet: clock input or output?
>>> (output).
>> ... snip ...
>>
>>>>> This is torvalds git head and it was still working at -rc1 and all
>>>>> kernels before that. When I just revert this commit, things also
>>>>> start working again, so I guess something must be wrong here?
>>>> Yes, this was also identified to be problematic by the kernelci boot
>>>> farms on another platform, see [1].
>>>>
>>>> [1]:
>>>> https://lore.kernel.org/linux-arm-kernel/5e0314da.1c69fb81.a7d63.29c1@
>>>> mx.google.com/
>>>>
>>>> Do you mind trying this patch and letting me know if it works for you.
>>>> Sriram, please also try it on your platforms and let me know if solves
>>>> the problem you were after. Thanks
>>> Works on both boards I had that were affected, so
>>> Tested-by: Heiko Stuebner <heiko@...ech.de>
>> Nacked-by : Sriram Dash <Sriram.dash@...sung.com>
>>
>>> Thanks
>>> Heiko
>>>
>>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> index cc8d7e7bf9ac..e192b8e0809e 100644
>>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
>>>> @@ -320,7 +320,7 @@ static int stmmac_mtl_setup(struct platform_device
>>>> *pdev,  static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
>>>>                          struct device_node *np, struct device *dev)
>>>> {
>>>> -       bool mdio = false;
>>>> +       bool mdio = true;
>>>>         static const struct of_device_id need_mdio_ids[] = {
>>>>                 { .compatible = "snps,dwc-qos-ethernet-4.10" },
>>>>                 {},
>>>> @@ -341,8 +341,9 @@ static int stmmac_dt_phy(struct
>>>> plat_stmmacenet_data *plat,
>>>>         }
>>>>
>>>>         if (plat->mdio_node) {
>> For the platforms which neither have mdio nor snps,dwmac-mdio property in
>> dt, they will not enter the block.
>> plat->mdio_node will always be false for them. Which, essentially, preserves
>> the mdio variable Boolean value defined at the start of the function.
>>
>>>> -               dev_dbg(dev, "Found MDIO subnode\n");
>>>> -               mdio = true;
>>>> +               mdio = of_device_is_available(plat->mdio_node);
>>>> +               dev_dbg(dev, "Found MDIO subnode, status: %sabled\n",
>>>> +                       mdio ? "en" : "dis");
>>>>         }
>>>>
>>>>         if (mdio) {
>>>>
>>>
>> There is a proposal for this problem solution. You can refer it at :
>> https://lkml.org/lkml/2020/1/7/14
>>
>>
>>
>> _______________________________________________
>> Linux-stm32 mailing list
>> Linux-stm32@...md-mailman.stormreply.com
>> https://st-md-mailman.stormreply.com/mailman/listinfo/linux-stm32

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