net: macb: Shorten max_tx_len to 4KiB - 56 on mpfs

On mpfs, with SRAM configured for 4 queues, setting max_tx_len
to GEM_TX_MAX_LEN=0x3f0 results multiple AMBA errors.
Setting max_tx_len to (4KiB - 56) removes those errors.

The details are described in erratum 1686 by Cadence

The max jumbo frame size is also reduced for mpfs to (4KiB - 56).

Signed-off-by: Daire McNamara <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Claudiu Beznea <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

0 files changed, 0 insertions, 0 deletions