pwm: pxa: Use abrupt shutdown mode

Switch to abrupt shutdown mode in order to stop the clock as soon as
possible when PWM is disabled. This minimizes the possibility of the
clock being re-enabled while it is still in the process of turning off,
which will result in the clock ending up erroneously disabled.

Signed-off-by: Doug Brown <doug@schmorgal.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20221113233639.24244-5-doug@schmorgal.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
index cf4d22c91929feaa0bcc51c91a9ae41a4cdc694b..00063ead7c0aee6e2e184650abaa628af95da323 100644 (file)
--- a/drivers/pwm/pwm-pxa.c
+++ b/drivers/pwm/pwm-pxa.c
@@ -85,7 +85,7 @@ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
        else
                dc = mul_u64_u64_div_u64(pv + 1, duty_ns, period_ns);
 
-       writel(prescale, pc->mmio_base + offset + PWMCR);
+       writel(prescale | PWMCR_SD, pc->mmio_base + offset + PWMCR);
        writel(dc, pc->mmio_base + offset + PWMDCR);
        writel(pv, pc->mmio_base + offset + PWMPCR);