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| author | Paul Mundt <lethal@linux-sh.org> | 2012-05-10 02:51:07 (GMT) |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2012-05-10 02:51:07 (GMT) |
| commit | 15f99cbd071aa402e113d342448603344a337046 (patch) | |
| tree | 56f98892d1bd38029988eb8931e2321ef7e79aa0 /arch/arm/plat-omap/dma.c | |
| parent | b2212ea41dacda8cce0e7681a3a6ccc76c63802e (diff) | |
| parent | 41797f75486d8ca3b98d7658c2a506ac7879a8e5 (diff) | |
| download | linux-fsl-qoriq-15f99cbd071aa402e113d342448603344a337046.tar.xz | |
Merge branch 'sh/rsk-updates' into sh-latest
Conflicts:
arch/sh/Kconfig
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/arm/plat-omap/dma.c')
| -rw-r--r-- | arch/arm/plat-omap/dma.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index ecdb3da..c58d896 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -916,6 +916,13 @@ void omap_start_dma(int lch) l |= OMAP_DMA_CCR_BUFFERING_DISABLE; l |= OMAP_DMA_CCR_EN; + /* + * As dma_write() uses IO accessors which are weakly ordered, there + * is no guarantee that data in coherent DMA memory will be visible + * to the DMA device. Add a memory barrier here to ensure that any + * such data is visible prior to enabling DMA. + */ + mb(); p->dma_write(l, CCR, lch); dma_chan[lch].flags |= OMAP_DMA_ACTIVE; @@ -965,6 +972,13 @@ void omap_stop_dma(int lch) p->dma_write(l, CCR, lch); } + /* + * Ensure that data transferred by DMA is visible to any access + * after DMA has been disabled. This is important for coherent + * DMA regions. + */ + mb(); + if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) { int next_lch, cur_lch = lch; char dma_chan_link_map[dma_lch_count]; |