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Commit ea8538a0 authored by Sonic Zhang's avatar Sonic Zhang Committed by Mike Frysinger
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Blackfin: add SSYNC to set_dma_sg() for descriptor fetching 



Make sure the internal core buffers are flushed before telling the DMA
engine to fetch the descriptor structure so that it gets the right values.

Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 9b9bfded

arch/blackfin/include/asm/dma.h

+7 −1
Original line number Diff line number Diff line
@@ -206,10 +206,16 @@ static inline unsigned long get_dma_curr_addr(unsigned int channel) 


static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize)

{

	/* Make sure the internal data buffers in the core are drained

	 * so that the DMA descriptors are completely written when the

	 * DMA engine goes to fetch them below.

	 */

	SSYNC();



	dma_ch[channel].regs->next_desc_ptr = sg;

	dma_ch[channel].regs->cfg =

		(dma_ch[channel].regs->cfg & ~(0xf << 8)) |

		((ndsize & 0xf) << 8);

	dma_ch[channel].regs->next_desc_ptr = sg;

}



static inline int dma_channel_active(unsigned int channel)