On 24-03-23, 09:49, Biju Das wrote:
> The device_pause() callback is needed for serial DMA (RZ/G2L
> SCIFA). Add support for device_pause() callback.
>
> Based on a patch in the BSP by Long Luu
> <long.luu.ur@xxxxxxxxxxx>
>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> ---
> drivers/dma/sh/rz-dmac.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
> index 3625925d9f9f..a0cfb8f75534 100644
> --- a/drivers/dma/sh/rz-dmac.c
> +++ b/drivers/dma/sh/rz-dmac.c
> @@ -822,6 +822,25 @@ static enum dma_status rz_dmac_tx_status(struct dma_chan *chan,
> return status;
> }
>
> +static int rz_dmac_device_pause(struct dma_chan *chan)
> +{
> + struct rz_dmac_chan *channel = to_rz_dmac_chan(chan);
> + struct rz_dmac *dmac = to_rz_dmac(chan->device);
> + unsigned int i;
> + u32 chstat;
> +
> + for (i = 0; i < 1024; i++) {
> + chstat = rz_dmac_ch_readl(channel, CHSTAT, 1);
> + if (!(chstat & CHSTAT_EN))
> + break;
> + udelay(1);
> + }
> +
> + rz_dmac_set_dmars_register(dmac, channel->index, 0);
> +
> + return 0;
> +}
> +
> /*
> * -----------------------------------------------------------------------------
> * IRQ handling
> @@ -1111,6 +1130,7 @@ static int rz_dmac_probe(struct platform_device *pdev)
> engine->device_terminate_all = rz_dmac_terminate_all;
> engine->device_issue_pending = rz_dmac_issue_pending;
> engine->device_synchronize = rz_dmac_device_synchronize;
> + engine->device_pause = rz_dmac_device_pause;
No resume?
>
> engine->copy_align = DMAENGINE_ALIGN_1_BYTE;
> dma_set_max_seg_size(engine->dev, U32_MAX);
> --
> 2.25.1
--
~Vinod
