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From: Lee Jones <lee.jones@linaro.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Daniel Thompson" <daniel.thompson@linaro.org>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
	linux-pwm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/4] backlight: pwm_bl: eliminate a 64/32 division
Date: Mon, 14 Oct 2019 08:27:25 +0100	[thread overview]
Message-ID: <20191014072725.GF4545@dell> (raw)
In-Reply-To: <20191008120327.24208-3-linux@rasmusvillemoes.dk>

On Tue, 08 Oct 2019, Rasmus Villemoes wrote:

> lightness*1000 is nowhere near overflowing 32 bits, so we can just use
> an ordinary 32/32 division, which is much cheaper than the 64/32 done
> via do_div().
> 
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> ---
>  drivers/video/backlight/pwm_bl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

WARNING: multiple messages have this Message-ID (diff)
From: Lee Jones <lee.jones@linaro.org>
To: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Daniel Thompson" <daniel.thompson@linaro.org>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
	linux-pwm@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/4] backlight: pwm_bl: eliminate a 64/32 division
Date: Mon, 14 Oct 2019 07:27:25 +0000	[thread overview]
Message-ID: <20191014072725.GF4545@dell> (raw)
In-Reply-To: <20191008120327.24208-3-linux@rasmusvillemoes.dk>

On Tue, 08 Oct 2019, Rasmus Villemoes wrote:

> lightness*1000 is nowhere near overflowing 32 bits, so we can just use
> an ordinary 32/32 division, which is much cheaper than the 64/32 done
> via do_div().
> 
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> ---
>  drivers/video/backlight/pwm_bl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

  reply	other threads:[~2019-10-14  7:27 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-08 12:03 [PATCH v2 0/4] backlight: pwm_bl: optimizations and small fix for cie1913 Rasmus Villemoes
2019-10-08 12:03 ` Rasmus Villemoes
2019-10-08 12:03 ` [PATCH v2 1/4] backlight: pwm_bl: fix cie1913 comments and constant Rasmus Villemoes
2019-10-08 12:03   ` Rasmus Villemoes
2019-10-14  7:27   ` Lee Jones
2019-10-14  7:27     ` Lee Jones
2019-10-23 20:21     ` Rasmus Villemoes
2019-10-23 20:21       ` Rasmus Villemoes
2019-10-23 20:21       ` Rasmus Villemoes
2019-10-08 12:03 ` [PATCH v2 2/4] backlight: pwm_bl: eliminate a 64/32 division Rasmus Villemoes
2019-10-08 12:03   ` Rasmus Villemoes
2019-10-14  7:27   ` Lee Jones [this message]
2019-10-14  7:27     ` Lee Jones
2019-10-08 12:03 ` [PATCH v2 3/4] backlight: pwm_bl: drop use of int_pow() Rasmus Villemoes
2019-10-08 12:03   ` Rasmus Villemoes
2019-10-14  7:27   ` Lee Jones
2019-10-14  7:27     ` Lee Jones
2019-10-08 12:03 ` [PATCH v2 4/4] backlight: pwm_bl: switch to power-of-2 base for fixed-point math Rasmus Villemoes
2019-10-08 12:03   ` Rasmus Villemoes
2019-10-14  7:27   ` Lee Jones
2019-10-14  7:27     ` Lee Jones

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