From f6ab95b55735fa03cad8d0f966647e5df206e207 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 8 Sep 2009 12:01:21 -0700 Subject: ioat: preserve chanctrl bits when re-arming interrupts The register write in ioat_dma_cleanup_tasklet is unfortunate in two ways: 1/ It clears the extra 'enable' bits that we set at alloc_chan_resources time 2/ It gives the impression that it disables interrupts when it is in fact re-arming interrupts [ Impact: fix, persist the value of the chanctrl register when re-arming ] Signed-off-by: Maciej Sosnowski Signed-off-by: Dan Williams --- drivers/dma/ioat/dma_v2.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'drivers/dma/ioat/dma_v2.c') diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c index 137cf879265f..2f34f290041e 100644 --- a/drivers/dma/ioat/dma_v2.c +++ b/drivers/dma/ioat/dma_v2.c @@ -341,8 +341,7 @@ static void ioat2_cleanup_tasklet(unsigned long data) struct ioat2_dma_chan *ioat = (void *) data; ioat2_cleanup(ioat); - writew(IOAT_CHANCTRL_INT_DISABLE, - ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); } /** @@ -454,7 +453,6 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat_chan_common *chan = &ioat->base; struct ioat_ring_ent **ring; - u16 chanctrl; u32 chanerr; int descs; int i; @@ -464,9 +462,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) return 1 << ioat->alloc_order; /* Setup register to interrupt and write completion status on error */ - chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | - IOAT_CHANCTRL_ERR_COMPLETION_EN; - writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET); + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); if (chanerr) { -- cgit