linux-kernel - Re: [PATCH] dma: pl330: Support per channel irq allocation

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Date:	Sun, 13 Oct 2013 21:01:11 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	linux-kernel@...r.kernel.org, monstr@...str.eu,
	Dan Williams <dan.j.williams@...el.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH] dma: pl330: Support per channel irq allocation

On Mon, Sep 30, 2013 at 08:50:48AM +0200, Michal Simek wrote:
> Some pl330 have per channel irq and it is necessary
> to allocate all of them. Loop over irq assigned for this
> device to support these pl330 IPs.
> 
> For example this IP is available on Xilinx Zynq platform.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> Hi Vinod,
> 
> this is the patch I told you about it. I have tested it
> just on Zynq(8 dma channels) but it shouldn't break
> any other pl330 clones.
> One more change has to be done to support all 8 dma channels
> which is to extend AMBA_NR_IRQS which is still 2.
> But I will send separate patch for it directly to Russell.

Thanks, this patch looks fine, Lars can you try testing this if you have this HW
please?

~Vinod
> 
> Thanks,
> Michal
> 
> ---
>  drivers/dma/pl330.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index 58623dc..96de393 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2922,11 +2922,18 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
> 
>  	amba_set_drvdata(adev, pdmac);
> 
> -	irq = adev->irq[0];
> -	ret = devm_request_irq(&adev->dev, irq, pl330_irq_handler, 0,
> -			dev_name(&adev->dev), pi);
> -	if (ret)
> -		return ret;
> +	for (i = 0; i <= AMBA_NR_IRQS; i++) {
> +		irq = adev->irq[i];
> +		if (irq) {
> +			ret = devm_request_irq(&adev->dev, irq,
> +					       pl330_irq_handler, 0,
> +					       dev_name(&adev->dev), pi);
> +			if (ret)
> +				return ret;
> +		} else {
> +			break;
> +		}
> +	}
> 
>  	pi->pcfg.periph_id = adev->periphid;
>  	ret = pl330_add(pi);
> --
> 1.8.2.3
> 



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