linux-kernel - Re: [PATCH v2] i2c: mediatek: i2c multi transfer optimization

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Date:	Thu, 3 Mar 2016 22:18:35 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Liguo Zhang <liguo.zhang@...iatek.com>
Cc:	srv_heupstream@...iatek.com,
	Matthias Brugger <matthias.bgg@...il.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Xudong Chen <xudong.chen@...iatek.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2] i2c: mediatek: i2c multi transfer optimization

On Fri, Feb 26, 2016 at 01:35:39AM +0800, Liguo Zhang wrote:
> Send the next transfer in the i2c irq handler, and only signal
> complete() when the entire transaction has been completed.

This describes what you do. But not why. Is this an improvment of
throughput? Is there a downside of interrupt latency?

Thanks.

> 
> Signed-off-by: Liguo Zhang <liguo.zhang@...iatek.com>
> ---
> change in v2:
> Remove the unused variable left_num in mtk_i2c_transfer().

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