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GMAC support for A733 - #12

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ziyao233 wants to merge 3 commits into
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a733/gmac-support
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GMAC support for A733#12
ziyao233 wants to merge 3 commits into
tina-devfrom
a733/gmac-support

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@ziyao233 ziyao233 commented Aug 3, 2026

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ziyao233 added 3 commits August 3, 2026 20:59
@ziyao233
net: stmmac: dwmac-sun55i: Add support for A733 GMAC variant
29d1b39 
A733 also ships a dwmac 4 GMAC controller, but its glue registers differ:
they are in a separate memory region instead of the syscon, and provide
wider fields for RGMII TX delay fine tunning. We also have a discrete
ahb reset, and we must delay glue register setup until clock/reset of the
GMAC is ready.

Note that we now use the externally-supplied RGMII clock as the GMAC
transmitting clock, since the internal one somehow doesn't work. This
doesn't match vendor driver behavior and requires investigation.

Signed-off-by: Yao Zi <me@ziyao.cc>
@ziyao233
arm64: dts: allwinner: Describe GMAC controller for A733
0626117 
Signed-off-by: Yao Zi <me@ziyao.cc>
@ziyao233
arm64: dts: allwinner: Enable GbE port on Demo AIOT
ceea69b 
The expected GMAC delay differs a lot from the value provided by the
vendor. It might be caused by we're working with another GMAC TX
clock, i.e., the one supplied through SoC's RGMII0-CLKIN pin.

Signed-off-by: Yao Zi <me@ziyao.cc>
@ziyao233
ziyao233 marked this pull request as draft August 3, 2026 21:22
@ziyao233

ziyao233 commented Aug 3, 2026

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Mark as draft for now since Kconfig updates couldn't be carried before #10 lands.

@ziyao233

ziyao233 commented Aug 3, 2026

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Speedtesting,

$ iperf3 -c 192.168.114.50 --udp -b 950M
Connecting to host 192.168.114.50, port 5201
[  5] local 192.168.114.51 port 48335 connected to 192.168.114.50 port 5201
[ ID] Interval           Transfer     Bitrate         Total Datagrams
[  5]   0.00-1.00   sec   113 MBytes   950 Mbits/sec  82028
[  5]   1.00-2.00   sec   113 MBytes   948 Mbits/sec  81866
[  5]   2.00-3.00   sec   113 MBytes   949 Mbits/sec  81954
[  5]   3.00-4.00   sec   113 MBytes   949 Mbits/sec  81954
[  5]   4.00-5.00   sec   113 MBytes   949 Mbits/sec  81881
[  5]   5.00-6.00   sec   106 MBytes   890 Mbits/sec  76914
[  5]   6.00-7.00   sec   111 MBytes   934 Mbits/sec  80588
[  5]   7.00-8.00   sec   113 MBytes   949 Mbits/sec  81931
[  5]   8.00-9.00   sec   113 MBytes   949 Mbits/sec  81947
[  5]   9.00-10.00  sec   113 MBytes   949 Mbits/sec  81950
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total Datagrams
[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec  0.000 ms  0/813013 (0%)  sender
[  5]   0.00-10.01  sec  1.10 GBytes   941 Mbits/sec  0.009 ms  0/813013 (0%)  receiver

iperf Done.
$ iperf3 -c 192.168.114.50                                            
Connecting to host 192.168.114.50, port 5201                               
[  5] local 192.168.114.51 port 46972 connected to 192.168.114.50 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   113 MBytes   949 Mbits/sec    1    358 KBytes       
[  5]   1.00-2.00   sec   111 MBytes   934 Mbits/sec    0    253 KBytes       
[  5]   2.00-3.00   sec   111 MBytes   932 Mbits/sec    4    247 KBytes       
[  5]   3.00-4.00   sec   111 MBytes   935 Mbits/sec    0    362 KBytes       
[  5]   4.00-5.00   sec   112 MBytes   935 Mbits/sec    1    355 KBytes       
[  5]   5.00-6.00   sec   112 MBytes   937 Mbits/sec    1    358 KBytes       
[  5]   6.00-7.00   sec   111 MBytes   932 Mbits/sec    0    365 KBytes       
[  5]   7.00-8.00   sec   112 MBytes   939 Mbits/sec    2    236 KBytes       
[  5]   8.00-9.00   sec   111 MBytes   929 Mbits/sec    1    348 KBytes       
[  5]   9.00-10.00  sec   112 MBytes   938 Mbits/sec    0    362 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -                                                                                                              
[ ID] Interval           Transfer     Bitrate         Retr                                                                                                     
[  5]   0.00-10.00  sec  1.09 GBytes   936 Mbits/sec   10            sender                                                                                    
[  5]   0.00-10.01  sec  1.09 GBytes   934 Mbits/sec                  receiver

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@ziyao233 @MingNeil