This patch improves the channel idle cheking by introduing a new varibale in chan private structure. Signed-off-by: Kedareswara rao Appana <appanad@xxxxxxxxxx> --- Changes for v2: ---> splitted the changes into multiple patches. drivers/dma/xilinx/xilinx_vdma.c | 41 ++++++++-------------------------------- 1 file changed, 8 insertions(+), 33 deletions(-) diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c index 8db07f7..51686d1 100644 --- a/drivers/dma/xilinx/xilinx_vdma.c +++ b/drivers/dma/xilinx/xilinx_vdma.c @@ -202,6 +202,7 @@ struct xilinx_vdma_tx_descriptor { * @has_sg: Support scatter transfers * @genlock: Support genlock mode * @err: Channel has errors + * @idle: Check for channel idle * @tasklet: Cleanup work after irq * @config: Device configuration info * @flush_on_fsync: Flush on Frame sync @@ -225,6 +226,7 @@ struct xilinx_vdma_chan { bool has_sg; bool genlock; bool err; + bool idle; struct tasklet_struct tasklet; struct xilinx_vdma_config config; bool flush_on_fsync; @@ -519,32 +521,6 @@ static enum dma_status xilinx_vdma_tx_status(struct dma_chan *dchan, } /** - * xilinx_vdma_is_running - Check if VDMA channel is running - * @chan: Driver specific VDMA channel - * - * Return: '1' if running, '0' if not. - */ -static bool xilinx_vdma_is_running(struct xilinx_vdma_chan *chan) -{ - return !(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & - XILINX_VDMA_DMASR_HALTED) && - (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) & - XILINX_VDMA_DMACR_RUNSTOP); -} - -/** - * xilinx_vdma_is_idle - Check if VDMA channel is idle - * @chan: Driver specific VDMA channel - * - * Return: '1' if idle, '0' if not. - */ -static bool xilinx_vdma_is_idle(struct xilinx_vdma_chan *chan) -{ - return vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & - XILINX_VDMA_DMASR_IDLE; -} - -/** * xilinx_vdma_halt - Halt VDMA channel * @chan: Driver specific VDMA channel */ @@ -614,6 +590,9 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan) if (list_empty(&chan->pending_list)) return; + if (!chan->idle) + return; + desc = list_first_entry(&chan->pending_list, struct xilinx_vdma_tx_descriptor, node); tail_desc = list_last_entry(&chan->pending_list, @@ -622,13 +601,6 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan) tail_segment = list_last_entry(&tail_desc->segments, struct xilinx_vdma_tx_segment, node); - /* If it is SG mode and hardware is busy, cannot submit */ - if (chan->has_sg && xilinx_vdma_is_running(chan) && - !xilinx_vdma_is_idle(chan)) { - dev_dbg(chan->dev, "DMA controller still busy\n"); - return; - } - /* * If hardware is idle, then all descriptors on the running lists are * done, start new transfers @@ -708,6 +680,7 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan) list_splice_tail_init(&chan->pending_list, &chan->active_list); chan->desc_pendingcount = 0; + chan->idle = false; } /** @@ -854,6 +827,7 @@ static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data) if (status & XILINX_VDMA_DMASR_FRM_CNT_IRQ) { spin_lock(&chan->lock); xilinx_vdma_complete_descriptor(chan); + chan->idle = true; xilinx_vdma_start_transfer(chan); spin_unlock(&chan->lock); } @@ -1212,6 +1186,7 @@ static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev, list_add_tail(&chan->common.device_node, &xdev->common.channels); xdev->chan[chan->id] = chan; + chan->idle = true; /* Reset the channel */ err = xilinx_vdma_chan_reset(chan); -- 2.1.2 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html