Re: macb: probe of 10090000.ethernet failed with error -110
From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2018-11-28 21:33:57
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+Andrew, Heiner, On 11/28/18 10:15 AM, Atish Patra wrote:
On 11/28/18 2:11 AM, Andreas Schwab wrote:quoted
The PHY probing of the macb driver appears to be rather unreliable. Most of the time it doesn't work the first time, I have to reload the module several times to let it succeed. [ 40.530000] macb: GEM doesn't support hardware ptp. [ 40.530000] libphy: MACB_mii_bus: probed [ 41.450000] macb 10090000.ethernet (unnamed net_device) (uninitialized): Could not attach to PHY [ 41.510000] macb: probe of 10090000.ethernet failed with error -110 [ 1354.400000] macb: GEM doesn't support hardware ptp. [ 1354.410000] libphy: MACB_mii_bus: probed [ 1355.260000] macb 10090000.ethernet (unnamed net_device) (uninitialized): Could not attach to PHY [ 1355.300000] macb: probe of 10090000.ethernet failed with error -110 [ 1358.100000] macb: GEM doesn't support hardware ptp. [ 1358.110000] libphy: MACB_mii_bus: probed [ 1358.310000] Microsemi VSC8541 SyncE 10090000.ethernet-ffffffff:00: attached PHY driver [Microsemi VSC8541 SyncE] (mii_bus:phy_addr=10090000.ethernet-ffffffff:00, irq=POLL) [ 1358.320000] macb 10090000.ethernet eth0: Cadence GEM rev 0x10070109 at 0x10090000 irq 12 (70:b3:d5:92:f1:07) This is 4.20-rc4 on a HiFive-U. Andreas.Here is my previous analysis on the issue. http://lists.infradead.org/pipermail/linux-riscv/2018-September/001503.html Not sure if you have tried the hack already. But here it is anyways. https://github.com/atishp04/riscv-linux/commit/aa230e7dc2ab01db5b630f427e57297ffc25c884
Andrew and I were discussing about this and we would recommend that you localize the workaround within the Vitesse PHY driver and within the driver's probe function. In order to avoid a chicken and egg problem though, you might have to change the PHY's compatible string in the Device Tree to include its PHY OUI, e.g: compatible = "ethernet-phy-1234.5678" which will force the OF layer registering MDIO/PHY devices to probe to the specific driver that matches that PHY. Let us know if this does not work, in which case we might have to introduce another DT property that indicate a "double reset" is required. -- Florian