Re: [PATCH 3/3] dmaengine: sh: rz-dmac: Add device_pause() callback

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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



[Index of Archives]     [Linux Samsung SOC]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux