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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Wolfram Sang <wsa@kernel.org>,
	Chris Packham <chris.packham@alliedtelesis.co.nz>,
	Rob Herring <robh+dt@kernel.org>,
	Guenter Roeck <linux@roeck-us.net>,
	Jean Delvare <jdelvare@suse.com>,
	linux-i2c <linux-i2c@vger.kernel.org>,
	devicetree <devicetree@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 6/6] i2c: mpc: Interrupt driven transfer
Date: Tue, 13 Apr 2021 01:57:58 +0300
Message-ID: <CAHp75VcB6sBxVRaJiER96_XGkDuN2sbJDhoPQW1=4NeVCE=8EA@mail.gmail.com> (raw)
In-Reply-To: <20210410201302.GC2471@kunai>

On Sat, Apr 10, 2021 at 11:15 PM Wolfram Sang <wsa@kernel.org> wrote:
>
> On Mon, Mar 29, 2021 at 02:52:06PM +1300, Chris Packham wrote:
> > The fsl-i2c controller will generate an interrupt after every byte
> > transferred. Make use of this interrupt to drive a state machine which
> > allows the next part of a transfer to happen as soon as the interrupt is
> > received. This is particularly helpful with SMBUS devices like the LM81
> > which will timeout if we take too long between bytes in a transfer.
> >
> > Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
>
> Okay, this change is too large and HW specific for a detailed review.
> But I trust you and hope you will be around to fix regressions if I
> apply it for 5.13? That kind of leads to the question if you want to
> step up as the maintainer for this driver?
>
> Only thing I noticed was a "BUG" and "BUG_ON" and wonder if we really
> need to halt the kernel in that case. Maybe WARN is enough?
>
> I'll apply the first five patches now, they look good to me.

And now is the time to revert the fifth one (at least, I don't know
the state of the rest).
It's obviously the series has not been tested (to some extent).

-- 
With Best Regards,
Andy Shevchenko

      parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29  1:52 [PATCH v2 0/6] i2c: mpc: Refactor to improve responsiveness Chris Packham
2021-03-29  1:52 ` [PATCH v2 1/6] dt-bindings: i2c-mpc: Document interrupt property as required Chris Packham
2021-03-30 15:13   ` Rob Herring
2021-03-29  1:52 ` [PATCH v2 2/6] dt-bindings: i2c: convert i2c-mpc to json-schema Chris Packham
2021-03-30 15:18   ` Rob Herring
2021-03-29  1:52 ` [PATCH v2 3/6] i2c: mpc: Make use of i2c_recover_bus() Chris Packham
2021-03-29  1:52 ` [PATCH v2 4/6] i2c: mpc: make interrupt mandatory and remove polling code Chris Packham
2021-04-10 20:16   ` Wolfram Sang
2021-04-11 23:57     ` Chris Packham
2021-03-29  1:52 ` [PATCH v2 5/6] i2c: mpc: use device managed APIs Chris Packham
2021-04-12 22:52   ` Andy Shevchenko
2021-04-12 22:55     ` Andy Shevchenko
2021-04-12 23:21     ` Chris Packham
2021-04-12 23:26       ` Chris Packham
2021-04-12 23:34       ` Andy Shevchenko
2021-03-29  1:52 ` [PATCH v2 6/6] i2c: mpc: Interrupt driven transfer Chris Packham
2021-04-10 20:13   ` Wolfram Sang
2021-04-11 21:31     ` Chris Packham
2021-04-12 18:17       ` Wolfram Sang
2021-04-12 22:57     ` Andy Shevchenko [this message]

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