From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B317E41223 for ; Wed, 15 Nov 2023 19:30:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0yeDS8Se" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0CFDC433C7; Wed, 15 Nov 2023 19:30:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700076607; bh=+PEr+LndLYXOn2B3hbYAB2FLmKD1Y7E6BgB5p3ArbUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0yeDS8Se5/pGDfpeQ+ey618qLx3qhWMlpPdYRhervz6pLTHYogD1gjmfxGHYOfOsm uDtFsI2iL7MIaWqsPA4z3s8IudGysiiIqAiYd19d0b/uTOvFvri3tqwy6eec6XZVvC vNT6za80vMV/JtG8b66UYQoeB0/2EBPVgGmR+Cek= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Aisheng Dong , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Daniel Thompson , Lee Jones , Sasha Levin Subject: [PATCH 6.5 336/550] backlight: pwm_bl: Disable PWM on shutdown, suspend and remove Date: Wed, 15 Nov 2023 14:15:20 -0500 Message-ID: <20231115191624.056264327@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115191600.708733204@linuxfoundation.org> References: <20231115191600.708733204@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Uwe Kleine-König [ Upstream commit 40da4737717b252fd01d92ff38d3b95a491167cc ] Since commit 00e7e698bff1 ("backlight: pwm_bl: Configure pwm only once per backlight toggle") calling pwm_backlight_power_off() doesn't disable the PWM any more. However this is necessary to suspend because PWM drivers usually refuse to suspend if they are still enabled. Also adapt shutdown and remove callbacks to disable the PWM for similar reasons. Fixes: 00e7e698bff1 ("backlight: pwm_bl: Configure pwm only once per backlight toggle") Reported-by: Aisheng Dong Tested-by: Aisheng Dong Signed-off-by: Uwe Kleine-König Reviewed-by: Daniel Thompson Link: https://lore.kernel.org/r/20231009093223.227286-1-u.kleine-koenig@pengutronix.de Signed-off-by: Lee Jones Signed-off-by: Sasha Levin --- drivers/video/backlight/pwm_bl.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index a51fbab963680..289bd9ce4d36d 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -626,9 +626,14 @@ static void pwm_backlight_remove(struct platform_device *pdev) { struct backlight_device *bl = platform_get_drvdata(pdev); struct pwm_bl_data *pb = bl_get_data(bl); + struct pwm_state state; backlight_device_unregister(bl); pwm_backlight_power_off(pb); + pwm_get_state(pb->pwm, &state); + state.duty_cycle = 0; + state.enabled = false; + pwm_apply_state(pb->pwm, &state); if (pb->exit) pb->exit(&pdev->dev); @@ -638,8 +643,13 @@ static void pwm_backlight_shutdown(struct platform_device *pdev) { struct backlight_device *bl = platform_get_drvdata(pdev); struct pwm_bl_data *pb = bl_get_data(bl); + struct pwm_state state; pwm_backlight_power_off(pb); + pwm_get_state(pb->pwm, &state); + state.duty_cycle = 0; + state.enabled = false; + pwm_apply_state(pb->pwm, &state); } #ifdef CONFIG_PM_SLEEP @@ -647,12 +657,24 @@ static int pwm_backlight_suspend(struct device *dev) { struct backlight_device *bl = dev_get_drvdata(dev); struct pwm_bl_data *pb = bl_get_data(bl); + struct pwm_state state; if (pb->notify) pb->notify(pb->dev, 0); pwm_backlight_power_off(pb); + /* + * Note that disabling the PWM doesn't guarantee that the output stays + * at its inactive state. However without the PWM disabled, the PWM + * driver refuses to suspend. So disable here even though this might + * enable the backlight on poorly designed boards. + */ + pwm_get_state(pb->pwm, &state); + state.duty_cycle = 0; + state.enabled = false; + pwm_apply_state(pb->pwm, &state); + if (pb->notify_after) pb->notify_after(pb->dev, 0); -- 2.42.0