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| author |   Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:00:22 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 15:00:22 +0000 |
| commit | 4de3a8e101150feaefa1139611a50ff37467f33e (patch) | |
| tree | daada742542518b02d7db7c5d32e715eaa5f166d /arch/arm/plat-omap/dma.c | |
| parent | ARM: 7275/1: LPAE: Check the CPU support for the long descriptor format (diff) | |
| parent | Merge branch 'akpm' (aka "Andrew's patch-bomb, take two") (diff) | |
| download | linux-dev-4de3a8e101150feaefa1139611a50ff37467f33e.tar.xz linux-dev-4de3a8e101150feaefa1139611a50ff37467f33e.zip | |
Merge branch 'master' into fixes
Diffstat (limited to 'arch/arm/plat-omap/dma.c')
| -rw-r--r-- | arch/arm/plat-omap/dma.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index c22217c2ee5f..002fb4d96bbc 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -1034,6 +1034,18 @@ dma_addr_t omap_get_dma_src_pos(int lch) if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0) offset = p->dma_read(CSAC, lch); + if (!cpu_is_omap15xx()) { + /* + * CDAC == 0 indicates that the DMA transfer on the channel has + * not been started (no data has been transferred so far). + * Return the programmed source start address in this case. + */ + if (likely(p->dma_read(CDAC, lch))) + offset = p->dma_read(CSAC, lch); + else + offset = p->dma_read(CSSA, lch); + } + if (cpu_class_is_omap1()) offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000); @@ -1062,8 +1074,16 @@ dma_addr_t omap_get_dma_dst_pos(int lch) * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is * read before the DMA controller finished disabling the channel. */ - if (!cpu_is_omap15xx() && offset == 0) + if (!cpu_is_omap15xx() && offset == 0) { offset = p->dma_read(CDAC, lch); + /* + * CDAC == 0 indicates that the DMA transfer on the channel has + * not been started (no data has been transferred so far). + * Return the programmed destination start address in this case. + */ + if (unlikely(!offset)) + offset = p->dma_read(CDSA, lch); + } if (cpu_class_is_omap1()) offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000); |