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bugfix i.mx6 pwm: prevent overflow of period_c * duty_ns

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Prevent overflow by casting duty_ns to ull first. This bug came up when trying to create a 200 Hz PWM

Signed-off-by: Brecht Neyrinck <bnrn@psicontrol.com>
Acked-by: Heiko Schocher<hs@denx.de>
This commit is contained in:
Brecht Neyrinck 2015-05-06 09:57:48 +02:00 committed by Stefano Babic
parent 0e1f991efb
commit b2580877b5
1 changed files with 1 additions and 1 deletions
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2
drivers/pwm/pwm-imx-util.c
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@ -56,7 +56,7 @@ int pwm_imx_get_parms(int period_ns, int duty_ns, unsigned long *period_c,
*prescale = *period_c / 0x10000 + 1;
*period_c /= *prescale;
c = (unsigned long long)(*period_c * duty_ns);
c = *period_c * (unsigned long long)duty_ns;
do_div(c, period_ns);
*duty_c = c;