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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 B5969C433E1 for ; Mon, 17 Aug 2020 19:08:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A57920738 for ; Mon, 17 Aug 2020 19:08:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597691335; bh=0/hszbWEWY+uc1pMJXENVvjhlqC59WOheY0I+GsN32Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zAAzZXgRL4LN+QkDzXCRmWUUrWOflsuV6NIZguNovGLthxYEuGhsOzX8k1FRs/Ud4 64LSThhmdZizZOb/1AwzwcyJgcrRtCefhmRzSq/+1PavXbHgpoI5fbWs0v3HAm1+LZ IsdwjgZh4AHH0tlonGtmEzfagRKYWOL5V7O0kyKc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392037AbgHQTIy (ORCPT ); Mon, 17 Aug 2020 15:08:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:53036 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387586AbgHQPmt (ORCPT ); Mon, 17 Aug 2020 11:42:49 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0BA9920760; Mon, 17 Aug 2020 15:42:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597678968; bh=0/hszbWEWY+uc1pMJXENVvjhlqC59WOheY0I+GsN32Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OQx9louYzBvCiw2ItBQJGKA9y/BYnDPLyYaM6hx3qr2yvBgRrQasgBdV9mGYv93CW Q5YRTNp7CrDBRLdBFTs7L789qSC1KZX7XbC79EkUkW02QgrcXCmX764SkRWQercq/X Z1AYSZFG+7kad4Sw6OalTBKT+jsh50/jBDjQ7nZo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ondrej Jirman , Maxime Ripard , Sasha Levin Subject: [PATCH 5.7 024/393] arm64: dts: sun50i-pinephone: dldo4 must not be >= 1.8V Date: Mon, 17 Aug 2020 17:11:14 +0200 Message-Id: <20200817143820.775296147@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143819.579311991@linuxfoundation.org> References: <20200817143819.579311991@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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