[PATCH v2 2/3] pwm: sun4i: Don't update the state for the caller of pwm_apply_state()

Uwe Kleine-König
2019-03-12T21:46:04Z

The pwm-sun4i driver is one of only two PWM drivers which updates the
state for the caller of pwm_apply_state(). This might have surprising
results if the caller reuses the values expecting them to still
represent the same state. Also note that this feedback was incomplete as
the matching struct pwm_device::state wasn't updated and so
pwm_get_state still returned the originally requested state.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/pwm/pwm-sun4i.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c
index 470d4f71e7eb..142a603fe7ea 100644
--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -193,12 +193,6 @@ static int sun4i_pwm_calculate(struct sun4i_pwm_chip *sun4i_pwm,
*dty = div;
*prsclr = prescaler;

- div = (u64)pval * NSEC_PER_SEC * *prd;
- state->period = DIV_ROUND_CLOSEST_ULL(div, clk_rate);
-
- div = (u64)pval * NSEC_PER_SEC * *dty;
- state->duty_cycle = DIV_ROUND_CLOSEST_ULL(div, clk_rate);
-
return 0;
}

--
2.20.1

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