linux-kernel - Re: [PATCH v4 1/2] i2c: aspeed: Handle the coalesced stop conditions with the start conditions.

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Date: Fri, 15 Dec 2023 02:42:48 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: Quan Nguyen <quan@...amperecomputing.com>
Cc: Brendan Higgins <brendan.higgins@...ux.dev>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	Wolfram Sang <wsa@...nel.org>,
	Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
	Guenter Roeck <linux@...ck-us.net>, linux-i2c@...r.kernel.org,
	openbmc@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Cosmo Chou <chou.cosmo@...il.com>,
	Open Source Submission <patches@...erecomputing.com>,
	Phong Vo <phong@...amperecomputing.com>,
	"Thang Q . Nguyen" <thang@...amperecomputing.com>
Subject: Re: [PATCH v4 1/2] i2c: aspeed: Handle the coalesced stop conditions
 with the start conditions.

Hi Quan,

On Mon, Dec 11, 2023 at 05:22:16PM +0700, Quan Nguyen wrote:
> Some masters may drive the transfers with low enough latency between
> the nak/stop phase of the current command and the start/address phase
> of the following command that the interrupts are coalesced by the
> time we process them.
> Handle the stop conditions before processing SLAVE_MATCH to fix the
> complaints that sometimes occur below.
> 
> "aspeed-i2c-bus 1e78a040.i2c-bus: irq handled != irq. Expected
> 0x00000086, but was 0x00000084"
> 
> Fixes: f9eb91350bb2 ("i2c: aspeed: added slave support for Aspeed I2C driver")
> Signed-off-by: Quan Nguyen <quan@...amperecomputing.com>
> Reviewed-by: Andrew Jeffery <andrew@...econstruct.com.au>
> Reviewed-by: Andi Shyti <andi.shyti@...nel.org>
> ---
> v4:
>   + Add an extra empty line before the comment                        [Andrew]
> 
> Note: I'd like to keep adding Reviewed-by Andrew and Andi for this patch
> eventhough there is an extra empty line added before the comment as mentioned
> above. Thanks for the review.

that's OK and you should. You would remove the r-b/a-b only if
you do some major changes. Besides, this change was asked both by
me and Andrew.

Thanks,
Andi