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Wed, 17 Apr 2024 17:38:56 +0200 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1rx7NA-002v0k-1O; Wed, 17 Apr 2024 17:38:56 +0200 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Lee Jones Cc: Linux regressions mailing list , linux-leds@vger.kernel.org, linux-pwm@vger.kernel.org, LKML , kernel@pengutronix.de Subject: [PATCH] leds: pwm: Disable PWM when going to suspend Date: Wed, 17 Apr 2024 17:38:47 +0200 Message-ID: <20240417153846.271751-2-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240417144943.GA2399047@google.com> References: <20240417144943.GA2399047@google.com> Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1658; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=qyfmY3tuy2fDo/5DK9wtBA0/okqOTXICerBpuVZMPmM=; b=owGbwMvMwMXY3/A7olbonx/jabUkhjT5t2x2gSvWxT6OUPWVELcyTMg/+5I1mz9ks+LOhwayE TXf2Ys6GY1ZGBi5GGTFFFnsG9dkWlXJRXau/XcZZhArE8gUBi5OAZjIui3s/2yeL68wc2r//tA0 21x3348vmWnzdy88wOpqPynQkV2ouU/x6ZYlDDV5Nhvlv19JF/h6LP3EmpzzQofyTqz9KqCQ4up RfunmknwxjbKzHPYB5dcDoi6vtGDUrz0fk1ZscFt8UpXtu19lHCtaolnsrZadZ3OdfERtdUJ8qI t5h2fq7PIcw6N8z+YHX+r7eHE7d+2u21YNC9+xT0nOOfJAe+UpKZsDh4rLr3xiY77tE3ZIpLwoa WOc34fLgbknVduDNs5ZtG5W4Olzkxbu2TLpafuOulj5L4vWK/BOrtSJ/rsylLGjZELpgnWJDTrs odZdlfblbfxRZkcVw9QeOkSZi2V5TzzQrlluNOlC7pEAAA== X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-pwm@vger.kernel.org On stm32mp1xx based machines (and others) a PWM consumer has to disable the PWM because an enabled PWM refuses to suspend. So check the LED_SUSPENDED flag and depending on that set the .enabled property. Link: https://bugzilla.kernel.org/show_bug.cgi?id=218559 Fixes: 76fe464c8e64 ("leds: pwm: Don't disable the PWM when the LED should be off") Signed-off-by: Uwe Kleine-König --- Hello, On Wed, Apr 17, 2024 at 03:49:43PM +0100, Lee Jones wrote: > On Tue, 16 Apr 2024, Uwe Kleine-König wrote: > > If you don't consider that suitable, I can create a patch that is easier > > to pick up. > > Yes, please submit it properly. Here it comes. Best regards Uwe drivers/leds/leds-pwm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) base-commit: 4eab358930711bbeb85bf5ee267d0d42d3394c2c diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 4e3936a39d0e..e1b414b40353 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -53,7 +53,13 @@ static int led_pwm_set(struct led_classdev *led_cdev, duty = led_dat->pwmstate.period - duty; led_dat->pwmstate.duty_cycle = duty; - led_dat->pwmstate.enabled = true; + /* + * Disabling a PWM doesn't guarantee that it emits the inactive level. + * So keep it on. Only for suspending the PWM should be disabled because + * otherwise it refuses to suspend. The possible downside is that the + * LED might stay (or even go) on. + */ + led_dat->pwmstate.enabled = !(led_cdev->flags & LED_SUSPENDED); return pwm_apply_might_sleep(led_dat->pwm, &led_dat->pwmstate); }