linux-kernel - Re: [PATCH 0/2] net: stmmac: add DT parameter to keep RX

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Message-ID: <20230125191453.GA2704119-robh@kernel.org>
Date:   Wed, 25 Jan 2023 13:14:53 -0600
From:   Rob Herring <robh@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Andrey Konovalov <andrey.konovalov@...aro.org>,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, krzysztof.kozlowski+dt@...aro.org,
        alexandre.torgue@...s.st.com, peppe.cavallaro@...com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 0/2] net: stmmac: add DT parameter to keep RX_CLK running
 in LPI state

On Tue, Jan 24, 2023 at 03:09:50PM +0100, Andrew Lunn wrote:
> > > Could
> > > dwmac-qcom-ethqos.c just do this unconditionally?
> > 
> > Never stopping RX_CLK in Rx LPI state would always work, but the power
> > consumption would somewhat increase (in Rx LPI state). Some people do care
> > about it.
> >
> > > Is the interrupt
> > > controller part of the licensed IP, or is it from QCOM? If it is part
> > > of the licensed IP, it is probably broken for other devices as well,
> > > so maybe it should be a quirk for all devices of a particular version
> > > of the IP?
> > 
> > Most probably this is the part of the ethernet MAC IP. And this is quite
> > possible that the issue is specific for particular versions of the IP.
> > Unfortunately I don't have the documentation related to this particular
> > issue.
> 
> Please could you ask around. Do you have contacts in Qualcomm?
> Contacts at Synopsys?
> 
> Ideally it would be nice to fix it for everybody, not just one SoC.

Yes, but to fix for just 1 SoC use the SoC specific compatible to imply 
the need for this. Then only a kernel update is needed to fix, not a 
kernel and dtb update.

Rob