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Miller" , Woojung Huh , Microchip Linux Driver Support , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH net-next 7/9] net: dsa: microchip: ksz9477: add hardware time stamping support Message-ID: <20201101111008.vl4lj4iqmqjdpbyg@skbuf> References: <20201019172435.4416-1-ceggers@arri.de> <1680734.pGj3N1mgWS@n95hx1g2> <20201030182447.2day7x3vad7xgcah@skbuf> <4928494.XgmExmOR0V@n95hx1g2> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4928494.XgmExmOR0V@n95hx1g2> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 01, 2020 at 10:35:01AM +0100, Christian Eggers wrote: > Hi Vladimir, > > On Friday, 30 October 2020, 19:24:47 CET, Vladimir Oltean wrote: > > On Thu, Oct 22, 2020 at 12:17:48PM +0200, Christian Eggers wrote: > > > I tried to study the effect of setting the ocmode bit on the KSZ either to > > > master or to slave. The main visible change is, that some PTP message > > > types > > > are be filtered out on RX: > > > - in "master" mode, "Sync" messages from other nodes will not be received > > > (but everything else like "Announce" seem to work) > > > - in "slave" mode, "Delay_Req" messages from other nodes will not be > > > received > > Could you dump the contents of your REG_PTP_MSG_CONF2 register? > runtime register value is 0x1004 (matches default value from the data sheet). > The Linux driver doesn't touch this register. Below is a dump of all PTP > related (global) registers. So the bit 5 ("Enable Dropping of Sync/Follow_Up and Delay_Req PTP Messages") is not set. When the PTP messages are dropped, do you know which error counter in ethtool -S is increasing?