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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:35446) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ozLYR-0007BT-NI; Sun, 27 Nov 2022 17:34:59 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.94.2) (envelope-from ) id 1ozLYL-0008Be-MG; Sun, 27 Nov 2022 17:34:53 +0000 Date: Sun, 27 Nov 2022 17:34:53 +0000 From: "Russell King (Oracle)" To: Maxime Chevallier Cc: davem@davemloft.net, Rob Herring , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, Andrew Lunn , Jakub Kicinski , Eric Dumazet , Paolo Abeni , Florian Fainelli , Heiner Kallweit , linux-arm-kernel@lists.infradead.org, Krzysztof Kozlowski , devicetree@vger.kernel.org Subject: Re: [PATCH net-next 0/3] net: pcs: altera-tse: simplify and clean-up the driver Message-ID: References: <20221125131801.64234-1-maxime.chevallier@bootlin.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20221125131801.64234-1-maxime.chevallier@bootlin.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221127_093521_554895_68E6B010 X-CRM114-Status: GOOD ( 18.07 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Nov 25, 2022 at 02:17:58PM +0100, Maxime Chevallier wrote: > Hello everyone, > > This small series does a bit of code cleanup in the altera TSE pcs > driver, removong unused register definitions, handling 1000BaseX speed > configuration correctly according to the datasheet, and making use of > proper poll_timeout helpers. > > No functional change is introduced. > > Best regards, > > Maxime > > Maxime Chevallier (3): > net: pcs: altera-tse: use read_poll_timeout to wait for reset > net: pcs: altera-tse: don't set the speed for 1000BaseX > net: pcs: altera-tse: remove unnecessary register definitions Hi Maxime, Please can you check the link timer settings: /* Set link timer to 1.6ms, as per the MegaCore Function User Guide */ tse_pcs_write(tse_pcs, SGMII_PCS_LINK_TIMER_0, 0x0D40); tse_pcs_write(tse_pcs, SGMII_PCS_LINK_TIMER_1, 0x03); This is true for Cisco SGMII mode - which is specified to use a 1.6ms link timer, but 1000baseX is specified by 802.3 to use a 10ms link timer interval, so this is technically incorrect for 1000base-X. So, if the MegaCore Function User Guide specifies 1.6ms for everything, it would appear to contradict 802.3. >From what I gather from the above, the link timer uses a value of 200000 for 1.6ms, which means it is using a 8ns clock period or 125MHz. If you wish to correct the link timer, you can use this: int link_timer; link_timer = phylink_get_link_timer_ns(interface) / 8; if (link_timer > 0) { tse_pcs_write(tse_pcs, SGMII_PCS_LINK_TIMER_0, link_timer); tse_pcs_write(tse_pcs, SGMII_PCS_LINK_TIMER_1, link_timer >> 16); } so that it gets set correctly depending on 'interface'. phylink_get_link_timer_ns() is an inline static function, so you should end up with the above fairly optimised, not that it really matters. Also worth documenting that the "8" there is 125MHz in nanoseconds - maybe in a similar way to pcs-lynx does. It does look like this Altera TSE PCS is very similar to pcs-lynx, maybe there's a possibility of refactoring both drivers to share code? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel