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-rw-r--r--arch/blackfin/kernel/bfin_dma_5xx.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c
index 07e02c0..8531693 100644
--- a/arch/blackfin/kernel/bfin_dma_5xx.c
+++ b/arch/blackfin/kernel/bfin_dma_5xx.c
@@ -249,6 +249,13 @@ static void __dma_memcpy(u32 daddr, s16 dmod, u32 saddr, s16 smod, size_t cnt, u
spin_lock_irqsave(&mdma_lock, flags);
+ /* Force a sync in case a previous config reset on this channel
+ * occurred. This is needed so subsequent writes to DMA registers
+ * are not spuriously lost/corrupted. Do it under irq lock and
+ * without the anomaly version (because we are atomic already).
+ */
+ __builtin_bfin_ssync();
+
if (bfin_read_MDMA_S0_CONFIG())
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
continue;