linux-kernel - Re: [PATCH 2/2] i2c: qup: Fixed the DMA segments length

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Date:	Fri, 15 Jul 2016 15:38:07 +0900
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Abhishek Sahu <absahu@...eaurora.org>
Cc:	agross@...eaurora.org, sricharan@...eaurora.org,
	architt@...eaurora.org, linux-arm-msm@...r.kernel.org,
	ntelkar@...eaurora.org, linux-kernel@...r.kernel.org,
	andy.gross@...aro.org, linux-i2c@...r.kernel.org,
	dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] i2c: qup: Fixed the DMA segments length

On Mon, May 09, 2016 at 06:14:31PM +0530, Abhishek Sahu wrote:
> 1. The current QCOM I2C driver code is failing for transfer length
> greater than 255. This is happening due to improper segments length
> as the I2C DMA segments can be maximum of 256 bytes.
> 
> 2. The transfer length tlen was being initialized with 0 for 256
> bytes, which is being passed for DMA mappings resulting in improper
> DMA mapping length.
> 
> This patch fixes the above said problems by initializing the block
> count with the values calculated in qup_i2c_set_blk_data and calculating
> the remaining length for last DMA segment. Also, the block data length
> need to be decremented after each transfer. Additionally, this patch
> corrects the tlen assignment for DMA mapping.
> 
> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>

Applied to for-next, thanks!


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