linux-kernel - Re: [PATCH v3 11/14] dmaengine: imx-sdma: fix ecspi1 rx dma not work on i.mx8mm

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Message-ID: <20190521041828.GG15118@vkoul-mobl>
Date:   Tue, 21 May 2019 09:48:28 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     "robh@...nel.org" <robh@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "plyatov@...il.com" <plyatov@...il.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>
Subject: Re: [PATCH v3 11/14] dmaengine: imx-sdma: fix ecspi1 rx dma not work
 on i.mx8mm

On 07-05-19, 09:16, Robin Gong wrote:
> Because the number of ecspi1 rx event on i.mx8mm is 0, the condition
> check ignore such special case without dma channel enabled, which caused
> ecspi1 rx works failed. Actually, no need to check event_id0, checking
> event_id1 is enough for DEV_2_DEV case because it's so lucky that event_id1
> never be 0.

Well is that by chance or design that event_id1 will be never 0?

> 
> Signed-off-by: Robin Gong <yibin.gong@....com>
> ---
>  drivers/dma/imx-sdma.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index a495c7f..86594fc 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -1370,8 +1370,8 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
>  
>  	sdma_channel_synchronize(chan);
>  
> -	if (sdmac->event_id0)
> -		sdma_event_disable(sdmac, sdmac->event_id0);
> +	sdma_event_disable(sdmac, sdmac->event_id0);
> +
>  	if (sdmac->event_id1)
>  		sdma_event_disable(sdmac, sdmac->event_id1);
>  
> @@ -1670,11 +1670,9 @@ static int sdma_config(struct dma_chan *chan,
>  	memcpy(&sdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
>  
>  	/* Set ENBLn earlier to make sure dma request triggered after that */
> -	if (sdmac->event_id0) {
> -		if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
> -			return -EINVAL;
> -		sdma_event_enable(sdmac, sdmac->event_id0);
> -	}
> +	if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
> +		return -EINVAL;
> +	sdma_event_enable(sdmac, sdmac->event_id0);
>  
>  	if (sdmac->event_id1) {
>  		if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events)
> -- 
> 2.7.4
> 

-- 
~Vinod