Re: [PATCH v12 03/12] Revert "dmaengine: imx-sdma: refine to load context only once"

From: Richard Leitner <richard.leitner@skidata.com>
To: Robin Gong <yibin.gong@nxp.com>
Cc: <mark.rutland@arm.com>, <broonie@kernel.org>,
	<robh+dt@kernel.org>, <catalin.marinas@arm.com>,
	<vkoul@kernel.org>, <will.deacon@arm.com>, <shawnguo@kernel.org>,
	<festevam@gmail.com>, <s.hauer@pengutronix.de>,
	<martin.fuzzey@flowbird.group>, <u.kleine-koenig@pengutronix.de>,
	<dan.j.williams@intel.com>, <matthias.schiffer@ew.tq-group.com>,
	<frieder.schrempf@kontron.de>, <r.schwebel@pengutronix.de>,
	<linux-spi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<devicetree@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, <kernel@pengutronix.de>,
	<dmaengine@vger.kernel.org>, <linux-imx@nxp.com>
Subject: Re: [PATCH v12 03/12] Revert "dmaengine: imx-sdma: refine to load context only once"
Date: Mon, 17 Aug 2020 07:38:13 +0200	[thread overview]
Message-ID: <20200817053813.GA551027@pcleri> (raw)
In-Reply-To: <1597161231-32303-4-git-send-email-yibin.gong@nxp.com>

On Tue, Aug 11, 2020 at 11:53:42PM +0800, Robin Gong wrote:
> This reverts commit ad0d92d7ba6aecbe2705907c38ff8d8be4da1e9c, because
> in spi-imx case, burst length may be changed dynamically.
> 
> Signed-off-by: Robin Gong <yibin.gong@nxp.com>
> Acked-by: Sascha Hauer <s.hauer@pengutronix.de>

Hi Robin,
thanks for the pointer to this patch.

As you suggested I've tested the two patches on my custom i.MX6DL
board. Therefore please feel free to add:

Tested-by: Richard Leitner <richard.leitner@skidata.com>

regards;rl

> ---
>  drivers/dma/imx-sdma.c | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 270992c..d305b80 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;
>  };
> @@ -984,9 +983,6 @@ 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)
> @@ -1029,8 +1025,6 @@ static int sdma_load_context(struct sdma_channel *sdmac)
>  
>  	spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
>  
> -	sdmac->context_loaded = true;
> -
>  	return ret;
>  }
>  
> @@ -1069,7 +1063,6 @@ static void sdma_channel_terminate_work(struct work_struct *work)
>  	vchan_get_all_descriptors(&sdmac->vc, &head);
>  	spin_unlock_irqrestore(&sdmac->vc.lock, flags);
>  	vchan_dma_desc_free_list(&sdmac->vc, &head);
> -	sdmac->context_loaded = false;
>  }
>  
>  static int sdma_terminate_all(struct dma_chan *chan)
> @@ -1337,7 +1330,6 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
>  
>  	sdmac->event_id0 = 0;
>  	sdmac->event_id1 = 0;
> -	sdmac->context_loaded = false;
>  
>  	sdma_set_channel_priority(sdmac, 0);
>  
> -- 
> 2.7.4
> 
> 

-- 
Richard Leitner
Hardware R&D / Senior Embedded Linux Engineer

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