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| author | Mike Frysinger <vapier.adi@gmail.com> | 2009-02-04 16:49:45 +0800 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2009-02-04 16:49:45 +0800 |
| commit | 41245ac5952e5b05e6fbb7c188eae0947f640189 (patch) | |
| tree | deb8cb8ec3c712a6e0c9745197d22899440176c3 /arch | |
| parent | c6bbd8ac54742f657bd223e03b5b70e73ba092cd (diff) | |
| download | linux-3.10-41245ac5952e5b05e6fbb7c188eae0947f640189.tar.gz linux-3.10-41245ac5952e5b05e6fbb7c188eae0947f640189.tar.bz2 linux-3.10-41245ac5952e5b05e6fbb7c188eae0947f640189.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 7 |
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 07e02c0d1c0..8531693fb48 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; |