From e802cbafcbd250a88cbd4ea7f9afb9c0d4267c7a Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Tue, 8 Oct 2019 14:03:25 +0200 Subject: 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 Reviewed-by: Daniel Thompson Signed-off-by: Lee Jones --- drivers/video/backlight/pwm_bl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/video/backlight/pwm_bl.c') 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)); -- cgit v1.2.3