From: Martin Blumenstingl martin.blumenstingl@googlemail.com
[ Upstream commit 2a1828e378c1b5ba1ff283ed8f8c5cc37bb391dc ]
A user reports (slightly shortened from the original message): libphy: lantiq,xrx200-mdio: probed mdio_bus 1e108000.switch-mii: MDIO device at address 17 is missing. gswip 1e108000.switch lan: no phy at 2 gswip 1e108000.switch lan: failed to connect to port 2: -19 lantiq,xrx200-net 1e10b308.eth eth0: error -19 setting up slave phy
This is a single-port board using the internal Fast Ethernet PHY. The user reports that switching to PHY scanning instead of configuring the PHY within device-tree works around this issue.
The documentation for the standalone variant of the PHY11G (which is probably very similar to what is used inside the xRX200 SoCs but having the firmware burnt onto that standalone chip in the factory) states that the PHY needs 300ms to be ready for MDIO communication after releasing the reset.
Add a 300ms delay after initializing all GPHYs to ensure that the GPHY firmware had enough time to initialize and to appear on the MDIO bus. Unfortunately there is no (known) documentation on what the minimum time to wait after releasing the reset on an internal PHY so play safe and take the one for the external variant. Only wait after the last GPHY firmware is loaded to not slow down the initialization too much ( xRX200 has two GPHYs but newer SoCs have at least three GPHYs).
Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200") Reviewed-by: Andrew Lunn andrew@lunn.ch Signed-off-by: Martin Blumenstingl martin.blumenstingl@googlemail.com Acked-by: Hauke Mehrtens hauke@hauke-m.de Reviewed-by: Florian Fainelli f.fainelli@gmail.com Link: https://lore.kernel.org/r/20201115165757.552641-1-martin.blumenstingl@google... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/lantiq_gswip.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/drivers/net/dsa/lantiq_gswip.c +++ b/drivers/net/dsa/lantiq_gswip.c @@ -26,6 +26,7 @@ */
#include <linux/clk.h> +#include <linux/delay.h> #include <linux/etherdevice.h> #include <linux/firmware.h> #include <linux/if_bridge.h> @@ -1821,6 +1822,16 @@ static int gswip_gphy_fw_list(struct gsw i++; }
+ /* The standalone PHY11G requires 300ms to be fully + * initialized and ready for any MDIO communication after being + * taken out of reset. For the SoC-internal GPHY variant there + * is no (known) documentation for the minimum time after a + * reset. Use the same value as for the standalone variant as + * some users have reported internal PHYs not being detected + * without any delay. + */ + msleep(300); + return 0;
remove_gphy: