From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rasmus Villemoes Subject: [PATCH v2 0/4] backlight: pwm_bl: optimizations and small fix for cie1913 Date: Tue, 8 Oct 2019 14:03:23 +0200 Message-ID: <20191008120327.24208-1-linux@rasmusvillemoes.dk> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Lee Jones , Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz , linux-pwm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Rasmus Villemoes List-Id: linux-pwm@vger.kernel.org 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