From: Uwe Kleine-König u.kleine-koenig@pengutronix.de
stable inclusion from stable-5.10.54 commit d92337bf54f27ee5a240ce5a168bf6dd6401b9f6 bugzilla: 175586 https://gitee.com/openeuler/kernel/issues/I4DVDU
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 65e2e6c1c20104ed19060a38f4edbf14e9f9a9a5 ]
As the last call to sprd_pwm_apply() might have exited early if state->enabled was false, the values for period and duty_cycle stored in pwm->state might not have been written to hardware and it must be ensured that they are configured before enabling the PWM.
Fixes: 8aae4b02e8a6 ("pwm: sprd: Add Spreadtrum PWM support") Signed-off-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Signed-off-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/pwm/pwm-sprd.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/pwm/pwm-sprd.c b/drivers/pwm/pwm-sprd.c index 5123d948efd6..9eeb59cb81b6 100644 --- a/drivers/pwm/pwm-sprd.c +++ b/drivers/pwm/pwm-sprd.c @@ -180,13 +180,10 @@ static int sprd_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, } }
- if (state->period != cstate->period || - state->duty_cycle != cstate->duty_cycle) { - ret = sprd_pwm_config(spc, pwm, state->duty_cycle, - state->period); - if (ret) - return ret; - } + ret = sprd_pwm_config(spc, pwm, state->duty_cycle, + state->period); + if (ret) + return ret;
sprd_pwm_write(spc, pwm->hwpwm, SPRD_PWM_ENABLE, 1); } else if (cstate->enabled) {