On 2024/9/6 11:50, Chukun Pan wrote: > Hi Junhao, > >> I have tried rgmii-id with tx_delay/rx_delay 0x38/0x15, or 0x0/0x0, >> or directly removed tx_delay/rx_delay, they all didn't transmit data. >> >> I saw in dwmac-rk.c that when using rgmii-id, the tx_delay/rx_delay >> properties in dt are ignored? > > When using rgmii-id mode, tx_delay and rx_delay can be removed directly. > But you need to test whether the rx/tx-internal-delay-ps is appropriate. > When tx_delay and rx_delay are removed, the driver prints some errors in kmsg. Maybe we need to modify the driver? Lines 1657 and 1668 of drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c: rk_gmac-dwmac fe010000.ethernet: Can not read property: tx_delay. rk_gmac-dwmac fe010000.ethernet: set tx_delay to 0x30 rk_gmac-dwmac fe010000.ethernet: Can not read property: rx_delay. rk_gmac-dwmac fe010000.ethernet: set rx_delay to 0x10 After testing, rx/tx-internal-delay-ps 1500 seems stable: $ ping 192.168.0.224 64 bytes from 192.168.0.224: icmp_seq=0 ttl=64 time=1.256 ms 64 bytes from 192.168.0.224: icmp_seq=1 ttl=64 time=1.146 ms ... $ iperf3 -t 60 -c 192.168.0.224 Connecting to host 192.168.0.224, port 5201 [ 4] local 192.168.0.101 port 59565 connected to 192.168.0.224 port 5201 [ ID] Interval Transfer Bandwidth [ 4] 0.00-1.00 sec 114 MBytes 956 Mbits/sec ... [ 4] 59.00-60.00 sec 112 MBytes 942 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth [ 4] 0.00-60.00 sec 6.58 GBytes 942 Mbits/sec sender [ 4] 0.00-60.00 sec 6.58 GBytes 942 Mbits/sec receiver Best regards, Junhao
