linux-kernel - Re: [PATCH 2/3] dmaengine: pl330: enable burst mode by parsing dt

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Message-ID: <57A6FD61.6080003@rock-chips.com>
Date:	Sun, 7 Aug 2016 17:20:33 +0800
From:	Xing Zheng <zhengxing@...k-chips.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Huibin Hong <huibin.hong@...k-chips.com>,
	devicetree@...r.kernel.org, dianders@...omium.org,
	briannorris@...omium.org, Caesar Wang <wxt@...k-chips.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 2/3] dmaengine: pl330: enable burst mode by parsing dt

Hi Shawn,

On 2016年08月05日 10:53, Shawn Lin wrote:
> Currently pl330 use single mode defaultly. But burst
> mode can improve efficiency of memory accessing. We
> couldn't enable it by defalut in case of breaking any
> Socs which don't support it.
>
> With burst mode supported, we could see the improvement
> significantly when tesing SPI transfer etc.
>
> default single mode
> [   88.292550] spi write 65536*1 cost 32402us speed:2022KB/S
>
> After applied with burst mode(len 16)
> [   17.625296] spi write 65536*1 cost 17830us speed:3675KB/S
>
> Cc: Huibin Hong <huibin.hong@...k-chips.com>
> Cc: Xing Zheng <zhengxing@...k-chips.com>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
>
Tested-by: Xing Zheng <zhengxing@...k-chips.com>

Thanks

-- 
- Xing Zheng