blackfin: limit the max memory dma peripheral transfer size to 4 bytes.
Othersize, the bf609 memory dma halts after being enabled.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
diff --git a/arch/blackfin/lib/string.c b/arch/blackfin/lib/string.c
index 44d8c6d..5b7ac0b 100644
--- a/arch/blackfin/lib/string.c
+++ b/arch/blackfin/lib/string.c
@@ -128,10 +128,12 @@
unsigned long limit;
#ifdef MSIZE
- limit = 6;
+ /* The max memory DMA memory transfer size is 32 bytes. */
+ limit = 5;
*dshift = MSIZE_P;
#else
- limit = 3;
+ /* The max memory DMA memory transfer size is 4 bytes. */
+ limit = 2;
*dshift = WDSIZE_P;
#endif
@@ -170,7 +172,8 @@
mod = 1 << bpos;
#ifdef PSIZE
- dsize |= min(3, bpos) << PSIZE_P;
+ /* The max memory DMA peripheral transfer size is 4 bytes. */
+ dsize |= min(2, bpos) << PSIZE_P;
#endif
/* Copy sram functions from sdram to sram */