linux-kernel - Re: [PATCH v2] net: stmmac: correct MAC propagation delay

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Message-ID: <ZMJy6yt4CL250x6Q@hoboy.vegasvil.org>
Date:   Thu, 27 Jul 2023 06:36:43 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Johannes Zink <j.zink@...gutronix.de>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        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>,
        Russell King <linux@...linux.org.uk>,
        patchwork-jzi@...gutronix.de, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v2] net: stmmac: correct MAC propagation delay

On Thu, Jul 27, 2023 at 09:20:10AM +0200, Johannes Zink wrote:
> Hi Richard,
> 
> On 7/26/23 22:57, Richard Cochran wrote:
> > On Mon, Jul 24, 2023 at 12:01:31PM +0200, Johannes Zink wrote:
> > 
> > Earlier versions of the IP core return zero from these...
> > 
> > > +#define	PTP_TS_INGR_LAT	0x68	/* MAC internal Ingress Latency */
> > > +#define	PTP_TS_EGR_LAT	0x6c	/* MAC internal Egress Latency */
> > 
> 
> good catch. Gonna send a v3 with a check to and set the values for dwmac v5 only.

AFAICT there is no feature bit that indicates the presence or absence
of these two registers.

Are you sure that *all* v5 IP cores have these?

I am not sure.

Thanks,
Richard