From: Greg Ungerer <gerg@xxxxxxxxxxx>
The dma cache support functions do not currently support the direction flag
DMA_BIDIRECTIONAL. If a driver passes this direction to dma_map_single or
friends you will get console output like this:
dma_sync_single_for_device: unsupported dir 0
For example when using the Intel e100 ethernet driver on a ColdFire platform
with PCI bus. You will get a stream of these messages coming out.
Modify the dma cache support code adding support for DMA_BIDIRECTIONAL. It is
actioned by doing a cache push operation.
Signed-off-by: Greg Ungerer <gerg@xxxxxxxxxxx>
---
arch/m68k/kernel/dma.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
index 27b5821..e546a55 100644
--- a/arch/m68k/kernel/dma.c
+++ b/arch/m68k/kernel/dma.c
@@ -105,6 +105,7 @@ void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
switch (dir) {
+ case DMA_BIDIRECTIONAL:
case DMA_TO_DEVICE:
cache_push(handle, size);
break;
--
1.7.0.4
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