> -----Original Message----- > From: Tony Lindgren [mailto:[email protected]] > Sent: Wednesday, October 14, 2009 10:36 PM > To: Shilimkar, Santosh > Cc: [email protected]; S, Venkatraman; Hari n; Jarkko Nikula > Subject: Re: [PATCH] ARM: OMAP: SDMA: Fix omap_stop_dma() API for channel > linking > > * Santosh Shilimkar <[email protected]> [091013 23:14]: > > OMAP sDMA driver API omap_stop_dma() doesn't really stop the dma when > used > > in linking scenario. This patch fixes the same. > > To me it looks like this will break things for omap1 as the DMA channel > interrupt is not disabled first. I guess the fix is to move the > "Disable all interrupts on the channel" part above clearing the > link mappings. Indeed it will break OMAP1. Initially I thought of putting this change at this place so that it takes care of both normal and linking scenario.
I will rework this and send v2. > This fix should be tested in linux-omap before we send this to mainline. Yes ofcourse. That what I meant by merge. > > Signed-off-by: Santosh Shilimkar <[email protected]> > > Signed-off-by: Venkatraman S <[email protected]> > > CC: Hari n <[email protected]> > > CC: Jarkko Nikula <[email protected]> > > --- > > arch/arm/plat-omap/dma.c | 9 +++++---- > > 1 files changed, 5 insertions(+), 4 deletions(-) > > > > diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c > > index fd3154a..633c123 100644 > > --- a/arch/arm/plat-omap/dma.c > > +++ b/arch/arm/plat-omap/dma.c > > @@ -975,6 +975,11 @@ void omap_stop_dma(int lch) > > { > > u32 l; > > > > + /* Disable the DMA channel */ > > + 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]; > > @@ -1000,10 +1005,6 @@ void omap_stop_dma(int lch) > > 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); > > -- > > 1.5.4.7 > > Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
