driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.

Some synopsys ip implementation doesn't support DMA store and forward mode,
such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds only.
Update document and devicetree as well.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index 261c563b5f06..eba0e5e59ebe 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -22,6 +22,11 @@ Required properties:
 - snps,pbl              Programmable Burst Length
 - snps,fixed-burst      Program the DMA to use the fixed burst mode
 - snps,mixed-burst      Program the DMA to use the mixed burst mode
+- snps,force_thresh_dma_mode    Force DMA to use the threshold mode for
+                                both tx and rx
+- snps,force_sf_dma_mode        Force DMA to use the Store and Forward
+                                mode for both tx and rx. This flag is
+                                ignored if force_thresh_dma_mode is set.
 
 Optional properties:
 - mac-address: 6 bytes, mac address