linux-kernel - Re: [PATCH v3 03/11] i2c: nomadik: simplify IRQ masking logic

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Message-Id: <CZOEO2E13Q67.1LQ5HNWPYU647@bootlin.com>
Date: Fri, 08 Mar 2024 14:33:31 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: "Andi Shyti" <andi.shyti@...nel.org>
Cc: "Linus Walleij" <linus.walleij@...aro.org>, "Rob Herring"
 <robh+dt@...nel.org>, "Krzysztof Kozlowski"
 <krzysztof.kozlowski+dt@...aro.org>, "Conor Dooley" <conor+dt@...nel.org>,
 "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
 <linux-arm-kernel@...ts.infradead.org>, <linux-i2c@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-mips@...r.kernel.org>, "Gregory Clement"
 <gregory.clement@...tlin.com>, "Vladimir Kondratiev"
 <vladimir.kondratiev@...ileye.com>, "Thomas Petazzoni"
 <thomas.petazzoni@...tlin.com>, "Tawfik Bayouk"
 <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH v3 03/11] i2c: nomadik: simplify IRQ masking logic

Hello,

On Fri Mar 8, 2024 at 1:27 PM CET, Andi Shyti wrote:
> Hi Theo,
>
> On Fri, Mar 08, 2024 at 09:57:39AM +0100, Théo Lebrun wrote:
> > Hello,
> > 
> > On Fri Mar 8, 2024 at 12:01 AM CET, Andi Shyti wrote:
> > > Hi Theo,
> > >
> > > On Wed, Mar 06, 2024 at 06:59:23PM +0100, Théo Lebrun wrote:
> > > > IRQ_MASK and I2C_CLEAR_ALL_INTS both mask available interrupts. IRQ_MASK
> > > > removes top options (bits 29-31). I2C_CLEAR_ALL_INTS removes reserved
> > > > options including top bits. Keep the latter.
> > > > 
> > > > 31  29  27  25  23  21  19  17  15  13  11  09  07  05  03  01
> > > >   30  28  26  24  22  20  18  16  14  12  10  08  06  04  02  00
> > > > --- IRQ_MASK: --------------------------------------------------
> > > >       1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
> > > > 0 0 0
> > > > --- I2C_CLEAR_ALL_INTS: ----------------------------------------
> > > >       1     1 1       1 1 1 1 1                   1 1 1 1 1 1 1
> > > > 0 0 0   0 0     0 0 0           0 0 0 0 0 0 0 0 0
> > > > 
> > > > Notice I2C_CLEAR_ALL_INTS is more restrictive than IRQ_MASK.
> > > > 
> > > > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> > > > Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> > >
> > > You did answer my question in v2, thanks, Theo!
> > 
> > Oops my mailer syntax is telling me that the lines starting with '---'
> > might cause issue as it might mark the end of commit messages. I'll fix
> > that in next revision. If it gets applied before that it should be
> > checked that part of the message doesn't get lost.
>
> mmhhh... right! No need to resend, if nothing else is needed from
> the series, please paste the commit message here and I will fix
> it.

The message would become the following (tab-indented). Both '---' turned
into '--' in the bit table. I confirmed `git am` does not truncate this
updated message.

	i2c: nomadik: simplify IRQ masking logic

	IRQ_MASK and I2C_CLEAR_ALL_INTS both mask available interrupts. IRQ_MASK
	removes top options (bits 29-31). I2C_CLEAR_ALL_INTS removes reserved
	options including top bits. Keep the latter.

	31  29  27  25  23  21  19  17  15  13  11  09  07  05  03  01
	  30  28  26  24  22  20  18  16  14  12  10  08  06  04  02  00
	-- IRQ_MASK: ---------------------------------------------------
	      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
	0 0 0
	-- I2C_CLEAR_ALL_INTS: -----------------------------------------
	      1     1 1       1 1 1 1 1                   1 1 1 1 1 1 1
	0 0 0   0 0     0 0 0           0 0 0 0 0 0 0 0 0

	Notice I2C_CLEAR_ALL_INTS is more restrictive than IRQ_MASK.

	Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
	Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>

Thanks for the quick follow-up!

--
Théo Lebrun, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com