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[213.220.236.33]) by smtp.gmail.com with ESMTPSA id rs8sm802460ejb.17.2021.04.27.17.20.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Apr 2021 17:20:03 -0700 (PDT) From: Roman Beranek X-Google-Original-From: Roman Beranek To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= , Lee Jones , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-sunxi@googlegroups.com, Roman Beranek Subject: [PATCH] pwm: sun4i: Round delay time up to a nearest jiffy Date: Wed, 28 Apr 2021 02:19:46 +0200 Message-Id: <20210428001946.1059426-1-roman.beranek@prusa3d.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210427_172006_817998_DC7B19AB X-CRM114-Status: GOOD ( 12.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org More often than not, a PWM period may span nowhere near as far as 1 jiffy, yet it still must be waited upon before the channel is disabled. Signed-off-by: Roman Beranek --- drivers/pwm/pwm-sun4i.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index ce5c4fc8d..f4b991048 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -285,7 +285,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, val = (duty & PWM_DTY_MASK) | PWM_PRD(period); sun4i_pwm_writel(sun4i_pwm, val, PWM_CH_PRD(pwm->hwpwm)); sun4i_pwm->next_period[pwm->hwpwm] = jiffies + - nsecs_to_jiffies(cstate.period + 1000); + nsecs_to_jiffies(cstate.period) + 1; if (state->polarity != PWM_POLARITY_NORMAL) ctrl &= ~BIT_CH(PWM_ACT_STATE, pwm->hwpwm);