diff options
| author |   Niklas Cassel <niklas.cassel@axis.com> | 2016-12-07 15:20:08 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-12-08 13:07:10 -0500 |
| commit | 4022d039a315951e59d95d22e79198d861ce4490 (patch) | |
| tree | b6e62d85500ffa47e347dfa4f380f3c69eaabbdf /drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | |
| parent | net: stmmac: add support for independent DMA pbl for tx/rx (diff) | |
| download | linux-dev-4022d039a315951e59d95d22e79198d861ce4490.tar.xz linux-dev-4022d039a315951e59d95d22e79198d861ce4490.zip | |
net: smmac: allow configuring lower pbl values
The driver currently always sets the PBLx8/PBLx4 bit, which means that
the pbl values configured via the pbl/txpbl/rxpbl DT properties are
always multiplied by 8/4 in the hardware.
In order to allow the DT to configure lower pbl values, while at the
same time not changing behavior of any existing device trees using the
pbl/txpbl/rxpbl settings, add a property to disable the multiplication
of the pbl by 8/4 in the hardware.
Suggested-by: Rabin Vincent <rabinv@axis.com>
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Acked-by: Alexandre Torgue <alexandre.torgue@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 | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c index 99b8040af592..612d3aaac9a4 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c @@ -98,7 +98,8 @@ static void dwmac1000_dma_init(void __iomem *ioaddr, * Note: before stmmac core 3.50 this mode bit was 4xPBL, and * post 3.5 mode bit acts as 8*PBL. */ - value |= DMA_BUS_MODE_MAXPBL; + if (dma_cfg->pblx8) + value |= DMA_BUS_MODE_MAXPBL; value |= DMA_BUS_MODE_USP; value &= ~(DMA_BUS_MODE_PBL_MASK | DMA_BUS_MODE_RPBL_MASK); value |= (txpbl << DMA_BUS_MODE_PBL_SHIFT); |