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video: avoid build failure on veyron board

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533ad9dc avoided an overflow but causes compilation
failure on 32bit boards (eg. veyron speedy)

this commit uses div_u64 which has a fallback codepath
for 32bit platforms

Signed-off-by: Alvaro Fernando García <alvarofernandogarcia@gmail.com>
Tested-by: Simon Glass <sjg@chromium.org>  # chromebook_jerry
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Alvaro Fernando García
2023-08-03 21:35:38 -03:00
committed by Kever Yang
parent bb38db086c
commit 8300cebcd6
1 changed files with 5 additions and 2 deletions
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7
drivers/video/pwm_backlight.c
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@@ -14,6 +14,7 @@
#include <pwm.h>
#include <asm/gpio.h>
#include <linux/delay.h>
#include <linux/math64.h>
#include <power/regulator.h>
/**
@@ -59,12 +60,14 @@ struct pwm_backlight_priv {
static int set_pwm(struct pwm_backlight_priv *priv)
{
u64 width;
uint duty_cycle;
int ret;
if (priv->period_ns) {
duty_cycle = (u64)priv->period_ns * (priv->cur_level - priv->min_level) /
(priv->max_level - priv->min_level);
width = priv->period_ns * (priv->cur_level - priv->min_level);
duty_cycle = div_u64(width,
(priv->max_level - priv->min_level));
ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,
duty_cycle);
} else {