linux-kernel - Re: [PATCH v2 net-next 2/2] net: stmmac: qcom-ethqos: add a DMA-reset quirk for sa8775p-ride

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Date: Thu, 27 Jun 2024 21:24:20 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Andrew Halaney <ahalaney@...hat.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Vinod Koul <vkoul@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2 net-next 2/2] net: stmmac: qcom-ethqos: add a
 DMA-reset quirk for sa8775p-ride

> Its not clear to me though if the "2500basex" mentioned here supports
> any in-band signalling from a Qualcomm SoC POV (not just the Aquantia
> phy its attached to, but in general). So maybe in that case its not a
> concern?

True 2500BaseX does have inband signalling, for the results of pause
negotiation.

However, in this case, this is not true 2500BaseX, but a hacked SGMII
overclocked to 2.5GHz. There is no inband signalling, because SGMII
signalling makes no sense when over clocked. So out of band signalling
will be used.

My understanding is that both ends of this link are not using true
2500BaseX, and this Qualcomm SoC is incapable of true 2500BaseX. So we
don't need to worry about it in the Qualcomm glue code.

However, what these patches should not block is some other vendors SoC
with true 2500BaseX from working correctly.

     Andrew