The following commit has been merged in the linux branch: commit 9da65a99e5e6a074c586474961dbf560e439df50 Author: Santosh Shilimkar santosh.shilimkar@ti.com Date: Thu Oct 22 14:46:31 2009 -0700
omap: SDMA: Fix omap_stop_dma() API for channel linking
OMAP sDMA driver API omap_stop_dma() doesn't really stop the dma when used in linking scenario.
The DMA channel needs to be disabled before resetting the chain. Also fix clearing of the OMAP_DMA_ACTIVE status in the linked case.
Cc: Hari n hari.zoom@gmail.com Cc: Jarkko Nikula jhnikula@gmail.com Signed-off-by: Santosh Shilimkar santosh.shilimkar@ti.com Signed-off-by: Venkatraman S svenkatr@ti.com Signed-off-by: Tony Lindgren tony@atomide.com
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c index 0eb676d..b53125f 100644 --- a/arch/arm/plat-omap/dma.c +++ b/arch/arm/plat-omap/dma.c @@ -978,6 +978,14 @@ void omap_stop_dma(int lch) { u32 l;
+ /* Disable all interrupts on the channel */ + if (cpu_class_is_omap1()) + dma_write(0, CICR(lch)); + + l = dma_read(CCR(lch)); + l &= ~OMAP_DMA_CCR_EN; + dma_write(l, CCR(lch)); + if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) { int next_lch, cur_lch = lch; char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT]; @@ -995,18 +1003,8 @@ void omap_stop_dma(int lch) next_lch = dma_chan[cur_lch].next_lch; cur_lch = next_lch; } while (next_lch != -1); - - return; }
- /* Disable all interrupts on the channel */ - if (cpu_class_is_omap1()) - dma_write(0, CICR(lch)); - - l = dma_read(CCR(lch)); - l &= ~OMAP_DMA_CCR_EN; - dma_write(l, CCR(lch)); - dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE; } EXPORT_SYMBOL(omap_stop_dma);