From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: "Benoît Monin" <benoit.monin@bootlin.com>,
"Andi Shyti" <andi.shyti@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Jarkko Nikula" <jarkko.nikula@linux.intel.com>,
"Mika Westerberg" <mika.westerberg@linux.intel.com>,
"Jan Dabros" <jsd@semihalf.com>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Clark Williams" <clrkwllms@kernel.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Gregory CLEMENT" <gregory.clement@bootlin.com>,
"Théo Lebrun" <theo.lebrun@bootlin.com>,
"Tawfik Bayouk" <tawfik.bayouk@mobileye.com>,
"Vladimir Kondratiev" <vladimir.kondratiev@mobileye.com>,
"Dmitry Guzman" <dmitry.guzman@mobileye.com>,
linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev
Subject: Re: [PATCH v2 2/5] i2c: designware: Optimize flag reading in i2c_dw_read()
Date: Thu, 6 Nov 2025 13:08:35 +0200 [thread overview]
Message-ID: <aQyBs6H1IHk7fSP2@smile.fi.intel.com> (raw)
In-Reply-To: <dce21d03-d6e3-4511-9b1b-5da92efc45a0@kernel.org>
On Thu, Nov 06, 2025 at 11:50:36AM +0100, Krzysztof Kozlowski wrote:
> On 31/10/2025 15:48, Andy Shevchenko wrote:
> > On Fri, Oct 31, 2025 at 03:35:40PM +0100, Benoît Monin wrote:
> >> Optimize the i2c_dw_read() function by reading the message flags only
> >> once per message, rather than for every byte.
> >>
> >> The message index is only modified by the outer loop, so reading the
> >> flags in the inner loop was always getting the same value.
> >
> > Does it affect the binary (compiled) file?
>
> It does not really matter that much, because new code is more readable -
> 'flags' depend on the outer (first) loop and they are used there, so
> that's where variable should be defined.
Did I oppose that?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2025-11-06 11:08 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-31 14:35 [PATCH v2 0/5] i2c: designware: Improve support of multi-messages transfer Benoît Monin
2025-10-31 14:35 ` [PATCH v2 1/5] dt-bindings: i2c: dw: Add Mobileye I2C controllers Benoît Monin
2025-10-31 14:58 ` Conor Dooley
2025-11-06 9:42 ` Benoît Monin
2025-11-06 10:36 ` Krzysztof Kozlowski
2025-10-31 14:35 ` [PATCH v2 2/5] i2c: designware: Optimize flag reading in i2c_dw_read() Benoît Monin
2025-10-31 14:48 ` Andy Shevchenko
2025-11-06 10:46 ` Benoît Monin
2025-11-06 10:50 ` Krzysztof Kozlowski
2025-11-06 11:08 ` Andy Shevchenko [this message]
2025-10-31 14:35 ` [PATCH v2 3/5] i2c: designware: Sort compatible strings in alphabetical order Benoît Monin
2025-10-31 14:52 ` Andy Shevchenko
2025-10-31 14:35 ` [PATCH v2 4/5] i2c: designware: Implement I2C_M_STOP support Benoît Monin
2025-10-31 14:57 ` Andy Shevchenko
2025-11-03 10:39 ` Mika Westerberg
2025-11-06 14:38 ` Benoît Monin
2025-10-31 14:35 ` [PATCH v2 5/5] i2c: designware: Support of controller with IC_EMPTYFIFO_HOLD_MASTER disabled Benoît Monin
2025-11-03 10:43 ` Mika Westerberg
2025-11-03 13:20 ` Andy Shevchenko
2025-11-03 13:30 ` Mika Westerberg
2025-11-06 15:40 ` Benoît Monin
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