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

arch/blackfin/kernel/bfin_dma_5xx.c

+7 −0
Original line number Diff line number Diff line
@@ -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;