linux-kernel - Re: [PATCH] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave

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Message-ID: <84946ffd-8e90-7b6a-6667-a10e27d31655@st.com>
Date:   Wed, 18 Dec 2019 10:52:53 +0000
From:   Hugues FRUCHET <hugues.fruchet@...com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>
CC:     "vkoul@...nel.org" <vkoul@...nel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] media: stm32-dcmi: Use dma_request_chan() instead
 dma_request_slave_channel()

Thanks for patching Peter,

No regression observed on my side.

Acked-by: Hugues Fruchet <hugues.fruchet@...com>

Best regards,
Hugues.

On 12/17/19 11:41 AM, Peter Ujfalusi wrote:
> dma_request_slave_channel() is a wrapper on top of dma_request_chan()
> eating up the error code.
> 
> By using dma_request_chan() directly the driver can support deferred
> probing against DMA.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>   drivers/media/platform/stm32/stm32-dcmi.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
> index 9392e3409fba..55351872b0c7 100644
> --- a/drivers/media/platform/stm32/stm32-dcmi.c
> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
> @@ -1910,10 +1910,10 @@ static int dcmi_probe(struct platform_device *pdev)
>   		return PTR_ERR(mclk);
>   	}
>   
> -	chan = dma_request_slave_channel(&pdev->dev, "tx");
> -	if (!chan) {
> +	chan = dma_request_chan(&pdev->dev, "tx");
> +	if (IS_ERR(chan)) {
>   		dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
> -		return -EPROBE_DEFER;
> +		return PTR_ERR(chan);
>   	}
>   
>   	spin_lock_init(&dcmi->irqlock);
>