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TDA4VM: the value of RX_MAXLEN reset to 1518 when re-connect the cable of phy

buaawkp
Expert 1345 points
Part Number: TDA4VM

Dear TI experts，

We use  TDA4VM linux + rtos sdk version 8.1. We need to config vlan,so we changed the value of  macro "CPSW_MACPORT_RX_MTU_DEFAULT"  frome 1518 to 1522 in cpsw_macport.c.  When TDA4 power on, the value of RX_MAXLEN register can be configed to 1522 successfully. But When we re-connect the cable of  the phy, this value changes to 1518. So we can't receive the package which length is 1522. We didn't find any code which might do this, so we guess this is a chip logic behavior. If so, is there any patch to fix this problem?

  • 0
    TI__Expert 3835 points

    do you or shall we have function call to "CPSW_MACPORT_RX_MTU_DEFAULT" when the h/w detects the cable plug-out and in again?

  • +1 in reply to Xu(SH) Liu
    TI__Guru 64780 points

    Hi,

    When even Link Down happens Soft reset of MAC Port will happen and registers will get Reset values.
    Default Reset value of RX_MAX_LEN Reg was 1518, because of above we are seeing 1518 value after Link Down and Link Up.

    We have to save the values before and restore after reset completion.
    It was taken care in SDK 8.2 onwards, Please refer to "CpswMacPort_reset" API from "<RTOS SDK>\ti-processor-sdk-rtos-j721e-evm-08_02_00_05\ti-processor-sdk-rtos-j721e-evm-08_02_00_05\pdk_jacinto_08_02_00_21\packages\ti\drv\enet\src\mod\cpsw_macport.c" file.

    Best Regards,
    Sudheer