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pwm: meson: Consider 128 a valid pre-divider

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The pre-divider allows configuring longer PWM periods compared to using
the input clock directly. The pre-divider is 7 bit wide, meaning it's
maximum value is 128 (the register value is off-by-one: 0x7f or 127).

Change the loop to also allow for the maximum possible value to be
considered valid.

Fixes: 211ed63075 ("pwm: Add support for Meson PWM Controller")
Signed-off-by: Martin Blumenstingl <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Martin Blumenstingl 2019-04-01 20:18:16 +02:00 • committed by Thierry Reding
commit 51496e4446
1 changed files with 2 additions and 2 deletions
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4
drivers/pwm/pwm-meson.c
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@ -184,7 +184,7 @@ static int meson_pwm_calc(struct meson_pwm *meson,
do_div(fin_ps, fin_freq);
/* Calc pre_div with the period */
for (pre_div = 0; pre_div < MISC_CLK_DIV_MASK; pre_div++) {
for (pre_div = 0; pre_div <= MISC_CLK_DIV_MASK; pre_div++) {
cnt = DIV_ROUND_CLOSEST_ULL((u64)period * 1000,
fin_ps * (pre_div + 1));
dev_dbg(meson->chip.dev, "fin_ps=%llu pre_div=%u cnt=%u\n",
@ -193,7 +193,7 @@ static int meson_pwm_calc(struct meson_pwm *meson,
break;
}
if (pre_div == MISC_CLK_DIV_MASK) {
if (pre_div > MISC_CLK_DIV_MASK) {
dev_err(meson->chip.dev, "unable to get period pre_div\n");
return -EINVAL;
}