linux-kernel - [PATCH v2 0/4] backlight: pwm_bl: optimizations and small fix for cie1913

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Date:   Tue,  8 Oct 2019 14:03:23 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-pwm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH v2 0/4] backlight: pwm_bl: optimizations and small fix for cie1913

These patches optimize the cie1913() implementation by using fewer 64
bit divisions and multiplications. It also contains a minor fix for
the linear constant used.

v2:
- Drop patch 5.
- Fix thinko in patch 4, otherwise no code change.
- Better changelog in patch 3.
- Add Daniel's Reviewed-By to the four patches.

Daniel, I took the liberty of adding your R-B to patch 4 despite
changing it a little to fix a thinko - I should add 1<<31 and not
1<<15. Please tell me if that was inappropriate.

Rasmus Villemoes (4):
  backlight: pwm_bl: fix cie1913 comments and constant
  backlight: pwm_bl: eliminate a 64/32 division
  backlight: pwm_bl: drop use of int_pow()
  backlight: pwm_bl: switch to power-of-2 base for fixed-point math

 drivers/video/backlight/pwm_bl.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

-- 
2.20.1