linux-kernel - Re: [PATCH v2 4/7] i2c: npcm: Modify timeout evaluation mechanism

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Message-ID: <CAHb3i=vSUqbsoRhnnyMOoteKP3GCoXmCd+UKQSN_QWqkRweuiA@mail.gmail.com>
Date: Sun, 8 Sep 2024 13:47:54 +0300
From: Tali Perry <tali.perry1@...il.com>
To: Andi Shyti <andi.shyti@...nel.org>
Cc: Tyrone Ting <warp5tw@...il.com>, avifishman70@...il.com, tmaimon77@...il.com, 
	venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com, 
	andriy.shevchenko@...ux.intel.com, wsa@...nel.org, rand.sec96@...il.com, 
	wsa+renesas@...g-engineering.com, tali.perry@...oton.com, 
	Avi.Fishman@...oton.com, tomer.maimon@...oton.com, KWLIU@...oton.com, 
	JJLIU0@...oton.com, kfting@...oton.com, openbmc@...ts.ozlabs.org, 
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] i2c: npcm: Modify timeout evaluation mechanism

Hi Andi,

On Fri, Sep 6, 2024 at 12:39 AM Andi Shyti <andi.shyti@...nel.org> wrote:
>
> Hi Tyrone,
>
> On Fri, Aug 30, 2024 at 11:46:37AM GMT, Tyrone Ting wrote:
> > Increase the timeout and treat it as the total timeout, including retries.
> > The total timeout is 2 seconds now.
>
> Why?

The users want to connect a lot of masters on the same bus.
This timeout is used to determine the time it takes to take bus ownership.
The transactions are very long, so waiting 35ms is not enough.

>
> > The i2c core layer will have chances to retry to call the i2c driver
> > transfer function if the i2c driver reports that the bus is busy and
> > returns EAGAIN.
> >
> > Fixes: 48acf8292280 ("i2c: Remove redundant comparison in npcm_i2c_reg_slave")
>
> What is the bug you are fixing?
>
> > Signed-off-by: Tyrone Ting <kfting@...oton.com>
>
> Still... can someone from the nuvoton supporters/reviewers check
> this patch?
>
> Thanks,
> Andi

Thanks,
Tali Perry,
Nuvoton Technologies.