linux-kernel - Re: [PATCH v1 03/15] Revert "dmaengine: imx-sdma: refine to load context only once"

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Date:   Thu, 19 May 2022 23:28:31 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Robin Gong <yibin.gong@....com>
Cc:     "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>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "plyatov@...il.com" <plyatov@...il.com>,
        "sean.nyekjaer@...vas.dk" <sean.nyekjaer@...vas.dk>,
        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 v1 03/15] Revert "dmaengine: imx-sdma: refine to load
 context only once"

On 23-04-19, 13:50, Robin Gong wrote:
> This reverts commit ad0d92d7ba6aecbe2705907c38ff8d8be4da1e9c, because

Please fix this as well

> in spi-imx case, burst length may be changed dynamically.

So what is the solution to handle different burst lengths, pls
explain...

> 
> Signed-off-by: Robin Gong <yibin.gong@....com>
> ---
>  drivers/dma/imx-sdma.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 99d9f43..407a56e 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -377,7 +377,6 @@ struct sdma_channel {
>  	unsigned long			watermark_level;
>  	u32				shp_addr, per_addr;
>  	enum dma_status			status;
> -	bool				context_loaded;
>  	struct imx_dma_data		data;
>  	struct work_struct		terminate_worker;
>  };
> @@ -988,9 +987,6 @@ static int sdma_load_context(struct sdma_channel *sdmac)
>  	int ret;
>  	unsigned long flags;
>  
> -	if (sdmac->context_loaded)
> -		return 0;
> -
>  	if (sdmac->direction == DMA_DEV_TO_MEM)
>  		load_address = sdmac->pc_from_device;
>  	else if (sdmac->direction == DMA_DEV_TO_DEV)
> @@ -1033,8 +1029,6 @@ static int sdma_load_context(struct sdma_channel *sdmac)
>  
>  	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
>  
> -	sdmac->context_loaded = true;
> -
>  	return ret;
>  }
>  
> @@ -1074,7 +1068,6 @@ static void sdma_channel_terminate_work(struct work_struct *work)
>  	sdmac->desc = NULL;
>  	spin_unlock_irqrestore(&sdmac->vc.lock, flags);
>  	vchan_dma_desc_free_list(&sdmac->vc, &head);
> -	sdmac->context_loaded = false;
>  }
>  
>  static int sdma_disable_channel_async(struct dma_chan *chan)
> -- 
> 2.7.4
> 

-- 
~Vinod