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Commit 67e1c406 authored by Jose Abreu's avatar Jose Abreu Committed by David S. Miller
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net: stmmac: Enable OSP for GMAC4 



This enables OSP (Operate on Second Packet) for GMAC4. The feature
allows DMA to fetch second descriptor while its still processing the
first one.

Running iperf, the performance gain is +/- 38%.

Signed-off-by: default avatarJose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 538e2de1

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

+4 −0
Original line number Diff line number Diff line
@@ -94,6 +94,10 @@ static void dwmac4_dma_init_tx_chan(void __iomem *ioaddr, 


	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));

	value = value | (txpbl << DMA_BUS_MODE_PBL_SHIFT);



	/* Enable OSP to get best performance */

	value |= DMA_CONTROL_OSP;



	writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));



	writel(dma_tx_phy, ioaddr + DMA_CHAN_TX_BASE_ADDR(chan));