linux-kernel - Re: [PATCH 3/3] dmaengine: pl330: support transfer unaligned with (burst len * burst size)

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Message-ID: <57A6FD9B.7000203@rock-chips.com>
Date:	Sun, 7 Aug 2016 17:21:31 +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 3/3] dmaengine: pl330: support transfer unaligned with
 (burst len * burst size)

Hi Shawn

On 2016年08月05日 10:53, Shawn Lin wrote:
> Currently pl330 doesn't support transfer which doesn't
> align with burst len * burst size. This should be only
> for single mode. Let's allow it for busrt mode if available.
>
> e.g. transfers 0x10002 bytes:
> First loop 256*16*16=0x10000, burst size is 1, burst length is 16.
> Then the second loop 2 bytes, burst size is 1, burst length is 1.
>
> f0041000:        DMAMOV CCR 0xbc02f1
> f0041006:        DMAMOV SAR 0xdd6c0000
> f004100c:        DMAMOV DAR 0xff1d0400
> f0041012:        DMALP_0 15
> f0041014:        DMALP_1 255
> f0041016:        DMAWFPB 12
> f0041018:        DMALDA
> f0041019:        DMASTPB 12
> f004101b:        DMAFLUSHP 12
> f004101d:        DMALPENDA_1 bjmpto_7
> f004101f:        DMALPENDA_0 bjmpto_b
> f0041021:        DMAMOV CCR 0x800201
> f0041027:        DMALP_1 1
> f0041029:        DMAWFPB 12
> f004102b:        DMALDA
> f004102c:        DMASTPB 12
> f004102e:        DMAFLUSHP 12
> f0041030:        DMALPENDA_1 bjmpto_7
> f0041032:        DMASEV 0
> f0041034:        DMAEND
>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
>
Tested-by: Xing Zheng <zhengxing@...k-chips.com>

Thanks.

-- 
- Xing Zheng