From: Florian Fainelli f.fainelli@gmail.com
[ Upstream commit 806fd188ce2a4f8b587e83e73c478e6484fbfa55 ]
After commit bfcb813203e619a8960a819bf533ad2a108d8105 ("net: dsa: configure the MTU for switch ports") my Lamobo R1 platform which uses an allwinner,sun7i-a20-gmac compatible Ethernet MAC started to fail by rejecting a MTU of 1536. The reason for that is that the DMA capabilities are not readable on this version of the IP, and there is also no 'tx-fifo-depth' property being provided in Device Tree. The property is documented as optional, and is not provided.
Chen-Yu indicated that the FIFO sizes are 4KB for TX and 16KB for RX, so provide these values through platform data as an immediate fix until various Device Tree sources get updated accordingly.
Fixes: eaf4fac47807 ("net: stmmac: Do not accept invalid MTU values") Suggested-by: Chen-Yu Tsai wens@csie.org Signed-off-by: Florian Fainelli f.fainelli@gmail.com Acked-by: Chen-Yu Tsai wens@csie.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c @@ -146,6 +146,8 @@ static int sun7i_gmac_probe(struct platf plat_dat->init = sun7i_gmac_init; plat_dat->exit = sun7i_gmac_exit; plat_dat->fix_mac_speed = sun7i_fix_speed; + plat_dat->tx_fifo_size = 4096; + plat_dat->rx_fifo_size = 16384;
ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv); if (ret)