On 04-12-23, 15:03, Paul Cercueil wrote:
> Instead of notifying userspace in the end-of-transfer (EOT) interrupt
> and program the hardware in the start-of-transfer (SOT) interrupt, we
> can do both things in the EOT, allowing us to mask the SOT, and halve
> the number of interrupts sent by the HDL core.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
> drivers/dma/dma-axi-dmac.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
> index 5109530b66de..beed91a8238c 100644
> --- a/drivers/dma/dma-axi-dmac.c
> +++ b/drivers/dma/dma-axi-dmac.c
> @@ -415,6 +415,7 @@ static bool axi_dmac_transfer_done(struct axi_dmac_chan *chan,
> list_del(&active->vdesc.node);
> vchan_cookie_complete(&active->vdesc);
> active = axi_dmac_active_desc(chan);
> + start_next = !!active;
Should this be in current patch, sounds like this should be a different
patch?
> }
> } else {
> do {
> @@ -1000,6 +1001,7 @@ static int axi_dmac_probe(struct platform_device *pdev)
> struct axi_dmac *dmac;
> struct regmap *regmap;
> unsigned int version;
> + u32 irq_mask = 0;
> int ret;
>
> dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
> @@ -1067,7 +1069,10 @@ static int axi_dmac_probe(struct platform_device *pdev)
>
> dma_dev->copy_align = (dmac->chan.address_align_mask + 1);
>
> - axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_MASK, 0x00);
> + if (dmac->chan.hw_sg)
> + irq_mask |= AXI_DMAC_IRQ_SOT;
> +
> + axi_dmac_write(dmac, AXI_DMAC_REG_IRQ_MASK, irq_mask);
>
> if (of_dma_is_coherent(pdev->dev.of_node)) {
> ret = axi_dmac_read(dmac, AXI_DMAC_REG_COHERENCY_DESC);
> --
> 2.42.0
>
--
~Vinod
