linux-kernel - Re: [PATCH] net: stmmac: dwmac-loongson: Add fix_soc

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Message-ID: <d9901633-956d-48f2-8b10-d18a760cc5f4@linux.dev>
Date: Thu, 6 Feb 2025 16:36:41 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: Qunqin Zhao <zhaoqunqin@...ngson.cn>
Cc: kuba@...nel.org, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, pabeni@...hat.com, chenhuacai@...nel.org,
 fancer.lancer@...il.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: dwmac-loongson: Add fix_soc_reset function


在 2/6/25 3:22 PM, Qunqin Zhao 写道:
>
> 在 2025/1/22 下午4:53, Yanteng Si 写道:
>>
>>
>>
>> 在 2025/1/22 09:31, Qunqin Zhao 写道:
>>>
>>> 在 2025/1/21 下午9:41, Yanteng Si 写道:
>>>>
>>>> 在 1/21/25 16:25, Qunqin Zhao 写道:
>>>>> Loongson's GMAC device takes nearly two seconds to complete DMA 
>>>>> reset,
>>>>> however, the default waiting time for reset is 200 milliseconds
>>>> Is only GMAC like this?
>>> At present, this situation has only been found on GMAC.
>>
>>>>> @@ -566,6 +578,7 @@ static int loongson_dwmac_probe(struct pci_dev 
>>>>> *pdev, const struct pci_device_id
>>>>>         plat->bsp_priv = ld;
>>>>>       plat->setup = loongson_dwmac_setup;
>>>>> +    plat->fix_soc_reset = loongson_fix_soc_reset;
>>>>
>>>> If only GMAC needs to be done this way, how about putting it inside 
>>>> the loongson_gmac_data()?
>>>
>>> Regardless of whether this situation occurs in other devices(like 
>>> gnet), this change will not have any impact on gnet, right?
>>>
>> Yeah，However, it is obvious that there is now a more suitable
>> place for it. In the Loongson driver, `loongson_gmac_data()`
>> and `loongson_default_data()` were designed from the beginning.
>> When GNET support was added later, `loongson_gnet_data()`
>> was designed. We once made great efforts to extract these codes
>> from the `probe()` . Are we going to go back to the past?
>>
>> Of course, I'm not saying that I disagree with you fixing the
>> GMAC in the `probe()`. I just think it's a bad start. After that,
>> other people may also put similar code here, and eventually
>> it will make the `probe` a mess.
>>
>> If you insist on doing this, please change the function name
>> to `loongson_gmac_fix_reset()`, just like `loongson_gnet_fix_speed`.
>
> Recently, it is found that GNET may also have a long DMA reset time.  
> And the commit

It seems that you haven't tested all the gnet devices. Please test all

the devices before sending v2. Since I've left Loongson, I only have

the 7A2000(gnet) device at hand to assist with the testing.

>
> message should be "Loongson's DWMAC device may take nearly two seconds 
> to complete DMA reset,
> however, the default waiting time for reset is 200 milliseconds".

The function name can refer to loongson_dwmac_setup.

       plat->setup = loongson_dwmac_setup;

+    plat->fix_soc_reset = loongson_dwmac_fix_reset;


Oh, don't forget the necessary comments.


Thanks

Yanteng