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| author |   Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2019-10-08 14:03:25 +0200 |
|---|---|---|
| committer |   Lee Jones <lee.jones@linaro.org> | 2019-10-14 08:57:45 +0100 |
| commit | e802cbafcbd250a88cbd4ea7f9afb9c0d4267c7a (patch) | |
| tree | 8525dc7336331c6b582082c14d70eb705360e20f /drivers/video/backlight/pwm_bl.c | |
| parent | backlight: pwm_bl: Fix cie1913 comments and constant (diff) | |
| download | linux-dev-e802cbafcbd250a88cbd4ea7f9afb9c0d4267c7a.tar.xz linux-dev-e802cbafcbd250a88cbd4ea7f9afb9c0d4267c7a.zip | |
backlight: pwm_bl: Eliminate a 64/32 division
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().
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 3525e04791ce..15d84da77ecd 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -178,7 +178,7 @@ static u64 cie1931(unsigned int lightness, unsigned int scale) */ lightness *= 100; if (lightness <= (8 * scale)) { - retval = DIV_ROUND_CLOSEST_ULL(lightness * 10, 9033); + retval = DIV_ROUND_CLOSEST(lightness * 10, 9033); } else { retval = int_pow((lightness + (16 * scale)) / 116, 3); retval = DIV_ROUND_CLOSEST_ULL(retval, (scale * scale)); |