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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 5364EC433DF for ; Sat, 8 Aug 2020 23:50:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C7FA20672 for ; Sat, 8 Aug 2020 23:50:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596930658; bh=0/hszbWEWY+uc1pMJXENVvjhlqC59WOheY0I+GsN32Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QZ9GCaAd4/JuPuOB5gWstvBM7T531CO6zsB538oZ7yyh9Y3nDDr/63K+DdIrZZN0S RPPTi+0pHCc5KJwe9KmldFsV9lVOMDmryJnXxi07Mg8Iwne7oARwypd0VrjpcKL5VR EY4a52YrVcqlPQ3m/8KCvGhlPwvQJwV8d4gsgauk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727902AbgHHXu5 (ORCPT ); Sat, 8 Aug 2020 19:50:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:48568 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726479AbgHHXgN (ORCPT ); Sat, 8 Aug 2020 19:36:13 -0400 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 Cc: Ondrej Jirman , Maxime Ripard , Sasha Levin , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.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 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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