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authorMike Frysinger <vapier.adi@gmail.com>2009-02-04 03:49:45 -0500
committerBryan Wu <cooloney@kernel.org>2009-02-04 03:49:45 -0500
commit41245ac5952e5b05e6fbb7c188eae0947f640189 (patch)
treedeb8cb8ec3c712a6e0c9745197d22899440176c3
parentc6bbd8ac54742f657bd223e03b5b70e73ba092cd (diff)
Blackfin arch: fix bug - Dmacopy failed in BF537-STAMP
Dmacopy failed in BF537-STAMP when copy from SRAM to SDRAM and kernel will reboot automatically. Fixing by doing a SSYNC before mucking with DMA registers Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
-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 07e02c0d1c07..8531693fb48d 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
249 249
250 spin_lock_irqsave(&mdma_lock, flags); 250 spin_lock_irqsave(&mdma_lock, flags);
251 251
252 /* Force a sync in case a previous config reset on this channel
253 * occurred. This is needed so subsequent writes to DMA registers
254 * are not spuriously lost/corrupted. Do it under irq lock and
255 * without the anomaly version (because we are atomic already).
256 */
257 __builtin_bfin_ssync();
258
252 if (bfin_read_MDMA_S0_CONFIG()) 259 if (bfin_read_MDMA_S0_CONFIG())
253 while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE)) 260 while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
254 continue; 261 continue;