Commit 41245ac5 authored by Mike Frysinger's avatar Mike Frysinger Committed by Bryan Wu
Browse files

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: default avatarMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent c6bbd8ac
......@@ -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;
......
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