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pwm: pwm-tiecap: Disable APWM mode after configure

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APWM mode is enabled while configuring PWM device. This was done to
handle shadow & immediate mode update of period and compare registers.
However, leaving it enabled after configuring will cause APWM output on
PWM pin even before enabling PWM device.
Fix the same by disabling APWM mode after configuring if PWM device is
not running.

Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
This commit is contained in:
Philip, Avinash 2012-08-23 12:29:46 +05:30 committed by Thierry Reding
parent b817bf5c72
commit c06fad9d28
1 changed files with 7 additions and 0 deletions
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7
drivers/pwm/pwm-tiecap.c
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@ -100,6 +100,13 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
writel(period_cycles, pc->mmio_base + CAP3);
}
if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
reg_val = readw(pc->mmio_base + ECCTL2);
/* Disable APWM mode to put APWM output Low */
reg_val &= ~ECCTL2_APWM_MODE;
writew(reg_val, pc->mmio_base + ECCTL2);
}
pm_runtime_put_sync(pc->chip.dev);
return 0;
}