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Received: from andrew by vps0.lunn.ch with local (Exim 4.93) (envelope-from ) id 1j1vfr-0006lH-0S; Wed, 12 Feb 2020 18:19:43 +0100 Date: Wed, 12 Feb 2020 18:19:42 +0100 From: Andrew Lunn To: Tim Harvey Subject: Re: [PATCH] net: thunderx: use proper interface type for RGMII Message-ID: <20200212171942.GR19213@lunn.ch> References: <1581108026-28170-1-git-send-email-tharvey@gateworks.com> <20200207210209.GD19213@lunn.ch> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200212_091951_323940_3312FF30 X-CRM114-Status: GOOD ( 16.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: netdev , open list , rrichter@marvell.com, linux-arm-kernel@lists.infradead.org, David Miller , sgoutham@marvell.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Feb 12, 2020 at 08:55:39AM -0800, Tim Harvey wrote: > On Fri, Feb 7, 2020 at 1:02 PM Andrew Lunn wrote: > > > > On Fri, Feb 07, 2020 at 12:40:26PM -0800, Tim Harvey wrote: > > > The configuration of the OCTEONTX XCV_DLL_CTL register via > > > xcv_init_hw() is such that the RGMII RX delay is bypassed > > > leaving the RGMII TX delay enabled in the MAC: > > > > > > /* Configure DLL - enable or bypass > > > * TX no bypass, RX bypass > > > */ > > > cfg = readq_relaxed(xcv->reg_base + XCV_DLL_CTL); > > > cfg &= ~0xFF03; > > > cfg |= CLKRX_BYP; > > > writeq_relaxed(cfg, xcv->reg_base + XCV_DLL_CTL); > > > > > > This would coorespond to a interface type of PHY_INTERFACE_MODE_RGMII_RXID > > > and not PHY_INTERFACE_MODE_RGMII. > > > > > > Fixing this allows RGMII PHY drivers to do the right thing (enable > > > RX delay in the PHY) instead of erroneously enabling both delays in the > > > PHY. > > > > Hi Tim > > > > This seems correct. But how has it worked in the past? Does this > > suggest there is PHY driver out there which is doing the wrong thing > > when passed PHY_INTERFACE_MODE_RGMII? > > > > Reviewed-by: Andrew Lunn > > > > Andrew, > > Yes, the DP83867 phy driver used on the Gateworks Newport boards would > configure the delay in an incompatible way when enabled. Hi Tim So it was broken? Maybe find the appropriate Fixes tag, and have David add it to stable? Andrew _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel