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Date: Sat, 12 Apr 2014 18:28:57 +0200 From: arno@...isbad.org (Arnaud Ebalard) To: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com> Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Willy Tarreau <w@....eu>, David Miller <davem@...emloft.net> Subject: [REGRESSION,BISECTED] mvneta broken in 3.14 on RN2120, RN102 and RN104 after e3a8786c10e7 Hi Thomas, Network is broken w/ 3.14 kernel on Netgear ReadyNAS 102 (the SoC is an Armada 370 using mvneta driver and rgmii phy): nothing sent, nothing received from the interface. This came as a surprise (it was reported by two users) as 3.14-rc8 was ok on my side. I also checked on a ReadyNAS 104 (Armada 370 using mvneta driver and rgmii phy for both interfaces) and a ReadyNAS 2120 (Armada XP using mvneta driver and rgmii phy for both interfaces). They are both affected too. A short bisect session pointed e3a8786c10e7 (net: mvneta: fix usage as a module on RGMII configurations). Reverting it put things back in order on those three devices. I took a quick look at e3a8786c10e7 commit and did some tests to narrow the root cause (I do not have A370 functional specification doc at hand today so I was not able to check mvneta details): -} - /* Start the Ethernet port RX and TX activity */ static void mvneta_port_up(struct mvneta_port *pp) { @@ -2756,12 +2728,15 @@ static void mvneta_port_power_up(struct mvneta_port *pp, int phy_mode) mvreg_write(pp, MVNETA_UNIT_INTR_CAUSE, 0); if (phy_mode == PHY_INTERFACE_MODE_SGMII) - mvneta_port_sgmii_config(pp); + mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_SGMII_SERDES_PROTO); + else + mvreg_write(pp, MVNETA_SERDES_CFG, MVNETA_RGMII_SERDES_PROTO); I built a first kernel with the 'else' branch above removed (rationale: SERDES config was not set for RGMII prior to the patch). The issue remained. - mvneta_gmac_rgmii_set(pp, 1); + val = mvreg_read(pp, MVNETA_GMAC_CTRL_2); + + val |= MVNETA_GMAC2_PCS_ENABLE | MVNETA_GMAC2_PORT_RGMII; I removed MVNETA_GMAC2_PCS_ENABLE flag setting (rationale: it was only done for SGMII prior to the patch and all my platforms have RGMII connected PHY). *The issue disappeared on all 3 NAS with that simple change*. Some additional notes: - you tested w/ mvneta as a module. Did you test w/ mvneta driver built in the kernel? This is what I have on my side. - e3a8786c10e7 is in 3.13.9 kernel and possibly previous ones: I can confirm 3.13.9 is also broken for me. - I initially thought the issue was specific to A370 (some differences in mvneta logic?) as all your tests had been done on AXP. This is the reason I also checked the RN2120 (mv78230) and it is impacted. Any idea is welcome. Cheers, a+ -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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