From 5257a3de5b34b7f89f71026fb553a0b84736ff66 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 18 Jun 2014 12:15:38 +0300 Subject: [PATCH] dmaengine: dw: don't perform DMA when dmaengine_submit is called commit dd8ecfcac66b4485416b2d1df0ec4798b198d7d6 upstream. Accordingly to discussion [1] and followed up documentation the DMA controller driver shouldn't start any DMA operations when dmaengine_submit() is called. This patch fixes the workflow in dw_dmac driver to follow the documentation. [1] http://www.spinics.net/lists/arm-kernel/msg125987.html Signed-off-by: Andy Shevchenko Signed-off-by: Vinod Koul Cc: "Petallo, MauriceX R" Signed-off-by: Greg Kroah-Hartman --- drivers/dma/TODO | 1 - drivers/dma/dw/core.c | 19 +++++++------------ 2 files changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/dma/TODO b/drivers/dma/TODO index 734ed02..b8045cd 100644 --- a/drivers/dma/TODO +++ b/drivers/dma/TODO @@ -7,7 +7,6 @@ TODO for slave dma - imx-dma - imx-sdma - mxs-dma.c - - dw_dmac - intel_mid_dma 4. Check other subsystems for dma drivers and merge/move to dmaengine 5. Remove dma_slave_config's dma direction. diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c index d585787..b0972b3 100644 --- a/drivers/dma/dw/core.c +++ b/drivers/dma/dw/core.c @@ -680,17 +680,9 @@ static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) * possible, perhaps even appending to those already submitted * for DMA. But this is hard to do in a race-free manner. */ - if (list_empty(&dwc->active_list)) { - dev_vdbg(chan2dev(tx->chan), "%s: started %u\n", __func__, - desc->txd.cookie); - list_add_tail(&desc->desc_node, &dwc->active_list); - dwc_dostart(dwc, dwc_first_active(dwc)); - } else { - dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__, - desc->txd.cookie); - list_add_tail(&desc->desc_node, &dwc->queue); - } + dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__, desc->txd.cookie); + list_add_tail(&desc->desc_node, &dwc->queue); spin_unlock_irqrestore(&dwc->lock, flags); @@ -1095,9 +1087,12 @@ dwc_tx_status(struct dma_chan *chan, static void dwc_issue_pending(struct dma_chan *chan) { struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + unsigned long flags; - if (!list_empty(&dwc->queue)) - dwc_scan_descriptors(to_dw_dma(chan->device), dwc); + spin_lock_irqsave(&dwc->lock, flags); + if (list_empty(&dwc->active_list)) + dwc_dostart_first_queued(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); } static int dwc_alloc_chan_resources(struct dma_chan *chan) -- 2.7.4