From patchwork Wed Jul 31 08:40:18 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 11067291 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C74D413B1 for ; Wed, 31 Jul 2019 08:40:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B059F28806 for ; Wed, 31 Jul 2019 08:40:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9F30028831; Wed, 31 Jul 2019 08:40:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2747928806 for ; Wed, 31 Jul 2019 08:40:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727732AbfGaIkV (ORCPT ); Wed, 31 Jul 2019 04:40:21 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:35098 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726168AbfGaIkV (ORCPT ); Wed, 31 Jul 2019 04:40:21 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x6V8eFfc078983; Wed, 31 Jul 2019 03:40:15 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1564562415; bh=f8OILjK+4xrFtumGGFPWPDxRCqrguz9p6urLvVz00sU=; h=From:To:CC:Subject:Date; b=j3PTc/Xcx9hTMnjgCer63vG17POH5udTLqEDNcL7ONFZFvIXCJVJLP5kzIGg7FLEA KndqyFc5myT8luPQYO/k/kOH7Ns6nR9mK5Lksp60mHMOnjL7uweKXLnrUSotuSJKLP 8Fe8+VB6nfgo2URujZLmogYjukgy+uNa9s64fEH0= Received: from DFLE104.ent.ti.com (dfle104.ent.ti.com [10.64.6.25]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x6V8eFnW016389 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 31 Jul 2019 03:40:15 -0500 Received: from DFLE100.ent.ti.com (10.64.6.21) by DFLE104.ent.ti.com (10.64.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Wed, 31 Jul 2019 03:40:14 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Wed, 31 Jul 2019 03:40:14 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id x6V8eCSn048437; Wed, 31 Jul 2019 03:40:13 -0500 From: Peter Ujfalusi To: , , CC: , , , Subject: [PATCH v3] backlight: gpio-backlight: Correct initial power state handling Date: Wed, 31 Jul 2019 11:40:18 +0300 Message-ID: <20190731084018.5318-1-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The default-on property - or the def_value via legacy pdata) should be handled as: if it is 1, the backlight must be enabled (kept enabled) if it is 0, the backlight must be disabled (kept disabled) This only works for the case when default-on is set. If it is not set then the brightness of the backlight is set to 0. Now if the backlight is enabled by external driver (graphics) the backlight will stay disabled since the brightness is configured as 0. The backlight will not turn on. In order to minimize screen flickering during device boot: The initial brightness should be set to 1. If booted in non DT mode or no phandle link to the backlight node: follow the def_value/default-on to select UNBLANK or POWERDOWN If in DT boot we have phandle link then leave the GPIO in a state which the bootloader left it and let the user of the backlight to configure it further. Signed-off-by: Peter Ujfalusi Reviewed-by: Daniel Thompson --- Hi, sorry for the delay, but got distracted a bit with the resend of this... Let's try again ;) Changes since v2 (https://lore.kernel.org/patchwork/patch/1002359/): - Rebased on drm-next Changes since v1: - Implement similiar initial power state handling as pwm backlight have Regards, Peter drivers/video/backlight/gpio_backlight.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c index e84f3087e29f..18e053e4716c 100644 --- a/drivers/video/backlight/gpio_backlight.c +++ b/drivers/video/backlight/gpio_backlight.c @@ -59,13 +59,11 @@ static int gpio_backlight_probe_dt(struct platform_device *pdev, struct gpio_backlight *gbl) { struct device *dev = &pdev->dev; - enum gpiod_flags flags; int ret; gbl->def_value = device_property_read_bool(dev, "default-on"); - flags = gbl->def_value ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW; - gbl->gpiod = devm_gpiod_get(dev, NULL, flags); + gbl->gpiod = devm_gpiod_get(dev, NULL, GPIOD_ASIS); if (IS_ERR(gbl->gpiod)) { ret = PTR_ERR(gbl->gpiod); @@ -79,6 +77,22 @@ static int gpio_backlight_probe_dt(struct platform_device *pdev, return 0; } +static int gpio_backlight_initial_power_state(struct gpio_backlight *gbl) +{ + struct device_node *node = gbl->dev->of_node; + + /* Not booted with device tree or no phandle link to the node */ + if (!node || !node->phandle) + return gbl->def_value ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; + + /* if the enable GPIO is disabled, do not enable the backlight */ + if (gpiod_get_value_cansleep(gbl->gpiod) == 0) + return FB_BLANK_POWERDOWN; + + return FB_BLANK_UNBLANK; +} + + static int gpio_backlight_probe(struct platform_device *pdev) { struct gpio_backlight_platform_data *pdata = @@ -136,7 +150,9 @@ static int gpio_backlight_probe(struct platform_device *pdev) return PTR_ERR(bl); } - bl->props.brightness = gbl->def_value; + bl->props.power = gpio_backlight_initial_power_state(gbl); + bl->props.brightness = 1; + backlight_update_status(bl); platform_set_drvdata(pdev, bl);