diff options
| author | Giuseppe CAVALLARO <peppe.cavallaro@st.com> | 2012-05-13 22:18:42 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-14 18:53:19 -0400 |
| commit | b9cde0a8be876c680cc549daa6246256864473fb (patch) | |
| tree | f9c3c69c40ecd673a77148ec0712d1f2e3f2309e /drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | |
| parent | cffb13f4d6fb5976f907c37e7fc7f6e6acb10d5f (diff) | |
| download | linux-0-day-b9cde0a8be876c680cc549daa6246256864473fb.tar.gz linux-0-day-b9cde0a8be876c680cc549daa6246256864473fb.tar.xz | |
stmmac: add mixed burst for DMA
In mixed burst (MB) mode, the AHB master always initiates
the bursts with fixed-size when the DMA requests transfers
of size less than or equal to 16 beats.
This patch adds the MB support and the flag that can be
passed from the platform to select it.
MB mode can also give some benefits in terms of performances
on some platforms.
v2: fixed Coding Style
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c index 3675c57315655..033500090f552 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c @@ -31,7 +31,7 @@ #include "dwmac_dma.h" static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, - int burst_len, u32 dma_tx, u32 dma_rx) + int mb, int burst_len, u32 dma_tx, u32 dma_rx) { u32 value = readl(ioaddr + DMA_BUS_MODE); int limit; @@ -66,6 +66,10 @@ static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, if (fb) value |= DMA_BUS_MODE_FB; + /* Mixed Burst has no effect when fb is set */ + if (mb) + value |= DMA_BUS_MODE_MB; + #ifdef CONFIG_STMMAC_DA value |= DMA_BUS_MODE_DA; /* Rx has priority over tx */ #endif |