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lib/math: move int_pow() from pwm_bl.c for wider use

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The integer exponentiation is used in few places and might be used in
the future by other call sites.  Move it to wider use.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: Ray Jui <[email protected]>
Cc: Thierry Reding <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andy Shevchenko 2019-05-14 15:43:08 -07:00 • committed by Linus Torvalds
commit 9f61589469
4 changed files with 34 additions and 16 deletions
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15
drivers/video/backlight/pwm_bl.c
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@ -155,21 +155,6 @@ static const struct backlight_ops pwm_backlight_ops = {
#ifdef CONFIG_OF
#define PWM_LUMINANCE_SCALE 10000 /* luminance scale */
/* An integer based power function */
static u64 int_pow(u64 base, int exp)
{
u64 result = 1;
while (exp) {
if (exp & 1)
result *= base;
exp >>= 1;
base *= base;
}
return result;
}
/*
* CIE lightness to PWM conversion.
*