Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10845C636CC for ; Tue, 7 Feb 2023 18:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231642AbjBGSP7 (ORCPT ); Tue, 7 Feb 2023 13:15:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231634AbjBGSPz (ORCPT ); Tue, 7 Feb 2023 13:15:55 -0500 Received: from mail-il1-x130.google.com (mail-il1-x130.google.com [IPv6:2607:f8b0:4864:20::130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E36DB3C284 for ; Tue, 7 Feb 2023 10:15:47 -0800 (PST) Received: by mail-il1-x130.google.com with SMTP id s10so2025704iln.6 for ; Tue, 07 Feb 2023 10:15:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=DIIm1+g/ieDfo2JsHwQzMqN/Ba3IscAwZj3f1TonJb0=; b=YzCZLNWtJxObUdTX43IEeAFhxBrw637FwOvoP4gEurknqZjz6o5VpokiV/MTyWNLbP qCNtBGl3Jozt8D7kQ/xCEybXV9BqImb43BlMUe61UGveju1/z0e0AxNPCRkO7KPE8IWC I1nLIMh1Owx5XBtLeo7dxRgAUjdcuOBXSUVZQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=DIIm1+g/ieDfo2JsHwQzMqN/Ba3IscAwZj3f1TonJb0=; b=hNwWDLpuRq/g4JPCO1eKBf7yxgVs6vJlMjl8H9X+HoYBr9UTOhQliaJQWnUdgVYeaW kDUQaR6NhQBGvcwXcqC42n2mRvzDvWCSMMTYvXgeHRhuigSVa3BxvgJRPxfylIvZIFYe D8KLaroYIroRW5n04HmibDyO3MAup4DqGckzKU1HGKdNVlnqU8cGLZ4jFHaKVS2khvwg 2NsIBTCA9PZGA4gbC7YMLABwTyDK4ihrmwhmgM3f7goK9bHp2tAOvpJxp+cbfDJs/I6+ 1vnkKfxZaj2DGcv/rCwy6Vb9my6SehCjjDiUytGj5RQhdM85QFxBd1s/pX9cvj84tghI PpiA== X-Gm-Message-State: AO0yUKWHv/5ZSI0kx12LuHYMUe0tJltZeS9oXnxIKv1p6u9rGIh+W0Sp UUDxW+jkzc6cTjHjzRCnMf5LDCBMATCX9PCT X-Google-Smtp-Source: AK7set+XchsPuKJ4lojMcTAhqn6IGV7VTuP7cvQpcmx2RAPuCQYg5u1XZjTeis8OAIqLVlb+52kw+g== X-Received: by 2002:a05:6e02:12ed:b0:313:ea54:e22 with SMTP id l13-20020a056e0212ed00b00313ea540e22mr2066121iln.23.1675793746897; Tue, 07 Feb 2023 10:15:46 -0800 (PST) Received: from localhost (30.23.70.34.bc.googleusercontent.com. [34.70.23.30]) by smtp.gmail.com with UTF8SMTPSA id d70-20020a0285cc000000b003a69bd12c6dsm4534819jai.58.2023.02.07.10.15.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Feb 2023 10:15:46 -0800 (PST) Date: Tue, 7 Feb 2023 18:15:46 +0000 From: Matthias Kaehlcke To: Douglas Anderson Cc: Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Jiri Kosina , Benjamin Tissoires , linux-input@vger.kernel.org, linux-arm-msm@vger.kernel.org, Dmitry Torokhov , devicetree@vger.kernel.org, Stephen Kitt , Konrad Dybcio , Andy Gross , linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/7] arm64: dts: qcom: sc7280: Add 3ms ramp to herobrine's pp3300_left_in_mlb Message-ID: References: <20230207024816.525938-1-dianders@chromium.org> <20230206184744.2.I13814cefc5ab3e0a39ebd09f052e3fd25d4e8f1d@changeid> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230206184744.2.I13814cefc5ab3e0a39ebd09f052e3fd25d4e8f1d@changeid> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Feb 06, 2023 at 06:48:11PM -0800, Douglas Anderson wrote: > The "pp3300_left_in_mlb" rail on herobrine eventually connects up to > "vreg_edp_3p3" on the qcard. On several herobrine designs this rail > has been measured to need more than 1ms to turn on. > > While technically a herobrine derivative (defined as anyone including > the "herobrine.dtsi") could change the board to make the rail rise > faster or slower, the fact that two boards (evoker and villager) both > measured it as taking more than 1ms implies that it's probably going > to be the norm. Thus, let's add a "regulator-enable-ramp-delay" > straight into the herobrine.dtsi to handle this. If a particular > derivative board needs a faster or slower one then they can override > it, though that feels unlikely. > > While we measured something a bit over 1ms, we'll choose 3ms to give > us a tiny bit of margin. This isn't a rail that turns off and on all > the time anyway and 3ms is nothing compared to the total amount of > time to power on a panel. > > Signed-off-by: Douglas Anderson Reviewed-by: Matthias Kaehlcke