netdev - Re: [PATCH net-next v13 06/15] net: stmmac: dwmac-loongson: Detach GMAC-specific platform data init

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Date: Tue, 25 Jun 2024 20:31:32 +0800
From: Yanteng Si <siyanteng@...ngson.cn>
To: Serge Semin <fancer.lancer@...il.com>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com,
 alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com,
 chenhuacai@...nel.org, linux@...linux.org.uk, guyinggang@...ngson.cn,
 netdev@...r.kernel.org, chris.chenfeiyang@...il.com, si.yanteng@...ux.dev
Subject: Re: [PATCH net-next v13 06/15] net: stmmac: dwmac-loongson: Detach
 GMAC-specific platform data init


在 2024/6/24 09:47, Serge Semin 写道:
> On Mon, Jun 17, 2024 at 06:00:19PM +0800, Yanteng Si wrote:
>> Hi Serge,
>>
>> 在 2024/6/15 00:19, Serge Semin 写道:
>>> On Wed, May 29, 2024 at 06:19:03PM +0800, Yanteng Si wrote:
>>>> Loongson delivers two types of the network devices: Loongson GMAC and
>>>> Loongson GNET in the framework of four CPU/Chipsets revisions:
>>>>
>>>>      Chip             Network  PCI Dev ID   Synopys Version   DMA-channel
>>>> LS2K1000 CPU         GMAC      0x7a03       v3.50a/v3.73a        1
>>>> LS7A1000 Chipset     GMAC      0x7a03       v3.50a/v3.73a        1
>>>> LS2K2000 CPU         GNET      0x7a13          v3.73a            8
>>>> LS7A2000 Chipset     GNET      0x7a13          v3.73a            1
>>> You mentioned in the cover-letter
>>> https://lore.kernel.org/netdev/cover.1716973237.git.siyanteng@loongson.cn/
>>> that LS2K now have GMAC NICs too:
>>> " 1. The current LS2K2000 also have a GMAC(and two GNET) that supports 8
>>>       channels, so we have to reconsider the initialization of
>>>       tx/rx_queues_to_use into probe();"
>>>
>>> But I don't see much changes in the series which would indicate that
>>> new data. Please clarify what does it mean:
>>>
>>> Does it mean LS2K2000 has two types of the DW GMACs, right?
>> Yes!
>>> Are both of them based on the DW GMAC v3.73a IP-core with AV-feature
>>> enabled and 8 DMA-channels?
>> Yes!
>>> Seeing you called the new device as GMAC it doesn't have an
>>> integrated PHY as GNETs do, does it? If so, then neither
>>> STMMAC_FLAG_DISABLE_FORCE_1000 nor loongson_gnet_fix_speed() relevant
>>> for the new device, right?
>> YES!
>>> Why haven't you changed the sheet in the commit log? Shall the sheet
>>> be updated like this:
>>>
>>>       Chip             Network  PCI Dev ID   Synopys Version   DMA-channel
>>>    LS2K1000 CPU         GMAC      0x7a03       v3.50a/v3.73a        1
>>>    LS7A1000 Chipset     GMAC      0x7a03       v3.50a/v3.73a        1
>>> +LS2K2000 CPU         GMAC      0x7a13          v3.73a            8
>>>    LS2K2000 CPU         GNET      0x7a13          v3.73a            8
>>>    LS7A2000 Chipset     GNET      0x7a13          v3.73a            1
>>>
>>> ?
>> No! PCI Dev ID of GMAC is 0x7a03. So:
>>
>>   LS2K1000 CPU         GMAC      0x7a03       v3.50a/v3.73a 1
>>   LS7A1000 Chipset     GMAC      0x7a03       v3.50a/v3.73a 1
>> +LS2K2000 CPU         GMAC      0x7a03          v3.73a 8
>>   LS2K2000 CPU         GNET      0x7a13          v3.73a 8
>>   LS7A2000 Chipset     GNET      0x7a13          v3.73a 1
>>
>>> I'll continue reviewing the series after the questions above are
>>> clarified.
>> OK, If anything else is unclear, please let me know.
> Got it. Thanks for clarifying. I'll get back to reviewing the series
> tomorrow. Sorry for the timebreak.

OK. No worries.


Thanks,

Yanteng


>
> -Serge(y)