From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2BB1C433E0 for ; Sat, 8 Aug 2020 23:39:06 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C14C920791 for ; Sat, 8 Aug 2020 23:39:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gK6X97Wq"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="f554LPEy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C14C920791 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YpWqdtS0zNELftVZqNfQJRYz/m1LXrn+2UP2tygBPKc=; b=gK6X97Wq40TOqzvL4qlg//uOe kPTufoK9xgbjVz7P6NNy0X2tfEffivH2id6XO523LR8fvjLZU8CGHc3XzSyaKqV6z0NEUbRv3YAVT +0wrC6SUOgnXfOmdjJodddYjeVBNGDmhW/TPBv2JnmMm6L8B2cOgOoAeODTn+dermX58t3sAfPyG7 947Q8GFac0XO+9yXLfZX2oDXk0yvvlMl4RZk0mg5HvD5P7yKbdlOKkTZPwXKe6FXXmh1LvU6vB4rP nS2w5txBFlg9FxfTKJOxAGbrcAfYT7Ar9pBZyg3b1unwUD0R6Xicj2sxBZExIgZvhQnsYndgCVT7H gMrnsIS7g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YOF-00012p-Nl; Sat, 08 Aug 2020 23:36:39 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k4YNp-0000ud-LY for linux-arm-kernel@lists.infradead.org; Sat, 08 Aug 2020 23:36:14 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 572E820791; Sat, 8 Aug 2020 23:36:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596929773; bh=0/hszbWEWY+uc1pMJXENVvjhlqC59WOheY0I+GsN32Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f554LPEyCAzkyMCHnI5UtEhZlGOejBA9tDgbInlWXYwTrfjtTlYIcsS+V0nElGcUZ rcOuYV6NHFgyBQ1aVB2BylQJvu5K5n/RB3R2RcVyv6dZCUVIgAVXZl44ooOOiJywhE tqlwD1Nwcpu0x+Gi66rSPUSyyiMfapNUJmtN4tu8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 23/72] arm64: dts: sun50i-pinephone: dldo4 must not be >= 1.8V Date: Sat, 8 Aug 2020 19:34:52 -0400 Message-Id: <20200808233542.3617339-23-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200808233542.3617339-1-sashal@kernel.org> References: <20200808233542.3617339-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200808_193613_809833_92B6DE72 X-CRM114-Status: GOOD ( 15.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ondrej Jirman , Sasha Levin , Maxime Ripard , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ondrej Jirman [ Upstream commit 86be5c789690eb08656b08c072c50a7b02bf41f1 ] Some outputs from the RTL8723CS are connected to the PL port (BT_WAKE_AP), which runs at 1.8V. When BT_WAKE_AP is high, the PL pin this signal is connected to is overdriven, and the whole PL port's voltage rises somewhat. This results in changing voltage on the R_PWM pin (PL10), which is the cause for backlight flickering very noticeably when typing on a Bluetooth keyboard, because backlight intensity is highly sensitive to the voltage of the R_PWM pin. Limit the maximum WiFi/BT I/O voltage to 1.8V to avoid overdriving the PL port pins via BT and WiFi IO port signals. WiFi and BT functionality is unaffected by this change. This completely stops the backlight flicker when using bluetooth. Fixes: 91f480d40942 ("arm64: dts: allwinner: Add initial support for Pine64 PinePhone") Signed-off-by: Ondrej Jirman Link: https://lore.kernel.org/r/20200703194842.111845-4-megous@megous.com Signed-off-by: Maxime Ripard Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi index cefda145c3c9d..342733a20c337 100644 --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi @@ -279,7 +279,7 @@ ®_dldo3 { ®_dldo4 { regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <3300000>; + regulator-max-microvolt = <1800000>; regulator-name = "vcc-wifi-io"; }; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel