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X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: wB3bdIqKREkmlzGl99LhXo0elINnVzxjyeC+tx0cGv+RLHoNZwyEhEu44FA+Dyzjr+mzgYsDJERhNfREJh7qNDDm8kO2+qRvfzpGESCU8Xg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR11MB5051 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220407_073008_793357_98018D09 X-CRM114-Status: GOOD ( 14.24 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 06/04/2022 08:36, Conor Dooley wrote: > On 05/04/2022 15:04, Andrew Lunn wrote: >> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >> >>> [ 2.818894] macb 20112000.ethernet eth0: PHY [20112000.ethernet-ffffffff:09] driver [Generic PHY] (irq=POLL) >>> [ 2.828915] macb 20112000.ethernet eth0: configuring for phy/sgmii link mode >>> [11.045411] macb 20112000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off >>> [11.053247] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready >> >> You have a multi-part link. You need that the PHY reports the line >> side is up. Put some printk in genphy_update_link() and look at >> phydev->link. You also need that the SGMII link between the PHY and >> the SoC is up. That is a bit harder to see, but try adding #define >> DEBUG at the top of phylink.c and phy.c so you get additional debug >> prints for the state machines. > > Tracked the state of phydev->link in genphy_update_link, never saw a > value other than 0. > > Using the debug prints in phylink.c I got the following: > [ 3.230364] macb 20112000.ethernet eth0: PHY [20112000.ethernet-ffffffff:09] driver [Vitesse VSC8662] (irq=POLL) > [ 3.240682] macb 20112000.ethernet eth0: phy: sgmii setting supported 0000000,00000000,000042ff advertising 0000000,00000000,000042ff > [ 3.252783] macb 20112000.ethernet eth0: configuring for phy/sgmii link mode > [ 3.259892] macb 20112000.ethernet eth0: major config sgmii > [ 3.265526] macb 20112000.ethernet eth0: phylink_mac_config: mode=phy/sgmii/Unknown/Unknown adv=0000000,00000000,00000000 pause=00 link=0 an=0 > [ 3.279249] macb 20112000.ethernet eth0: phy link down sgmii/Unknown/Unknown/off > > I couldn't see any prints out of phy.c I think I have found the problem. While the SMGII clock is not in Linux's remit, the mac clocks are. Without CONFIG_PM I see the following, where 5 represents the clock for MAC1: [ 0.907959] mpfs_periph_clk_enable: 5 [ 1.312955] macb 20112000.ethernet eth0: Cadence GEM rev 0x0107010c at 0x20112000 irq 17 (00:04:a3:4d:4c:dc) [ 2.660376] macb 20112000.ethernet eth0: PHY [20112000.ethernet-ffffffff:09] driver [Generic PHY] (irq=POLL) [ 2.670400] macb 20112000.ethernet eth0: configuring for phy/sgmii link mode [ 6.789474] macb 20112000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off With CONFIG_PM, the MAC1 clock gets disabled between mac and phy bringup. 4 is the clock for the other MAC: [ 0.932598] mpfs_periph_clk_enable: 5 [ 1.327876] macb 20112000.ethernet eth0: Cadence GEM rev 0x0107010c at 0x20112000 irq 17 (00:04:a3:4d:4c:dc) [ 1.473632] mpfs_periph_clk_disable: 5 [ 1.503327] mpfs_periph_clk_disable: 4 [ 2.999528] mpfs_periph_clk_enable: 5 [ 3.000300] macb 20112000.ethernet eth0: validation of sgmii with support 0000000,00000000,00006280 and advertisement 0000000,00000000,00004280 failed: -EINVAL [ 3.018612] macb 20112000.ethernet eth0: Could not attach PHY (-22) [ 3.143594] mpfs_periph_clk_disable: 5 However the clock driver is actually not only disabling the clock, but also putting peripherals into reset when the clock to them is disabled. Removing the reset gives: [ 0.934717] mpfs_periph_clk_enable: 5 [ 1.326564] macb 20112000.ethernet eth0: Cadence GEM rev 0x0107010c at 0x20112000 irq 17 (00:04:a3:4d:4c:dc) [ 1.473155] mpfs_periph_clk_disable: 5 [ 1.502805] mpfs_periph_clk_disable: 4 [ 3.006384] mpfs_periph_clk_enable: 5 [ 3.007691] macb 20112000.ethernet eth0: PHY [20112000.ethernet-ffffffff:09] driver [Generic PHY] (irq=POLL) [ 3.021409] macb 20112000.ethernet eth0: configuring for phy/sgmii link mode [ 7.114710] macb 20112000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off Thanks for your help in figuring this out, looks like the problem is mine to fix :) Thanks again, Conor. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv