From patchwork Fri Dec 9 02:06:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 633001 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 7FF64C001B2 for ; Fri, 9 Dec 2022 02:06:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229983AbiLICGc (ORCPT ); Thu, 8 Dec 2022 21:06:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230085AbiLICGa (ORCPT ); Thu, 8 Dec 2022 21:06:30 -0500 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC4417D096 for ; Thu, 8 Dec 2022 18:06:29 -0800 (PST) Received: by mail-pj1-x102f.google.com with SMTP id 3-20020a17090a098300b00219041dcbe9so3452495pjo.3 for ; Thu, 08 Dec 2022 18:06:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=VheF3QaaF2exP1BBRM3nf5LuJc1NkNdCQqtMnYJ/9kg=; b=JhH5QWI4fDvw6CK0ooJ1jAUGCVa2TJ2L4YPH3WJ33TpDW1aNUQy6OBN6UDsX7k3vSW hb85z+ffV5H2emu8I+9J0FKxNDC5dhJkEZz+dYfWyzhXjDrxyFPQcAzz/SqZLag6rv0u JhET5YQSpY9ESn3sIh1jLQFEzrCcTCfJZpPpg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=VheF3QaaF2exP1BBRM3nf5LuJc1NkNdCQqtMnYJ/9kg=; b=M/scm8xgFblIjao4Bshby+iXuAIujdDhvEjocPDTA/BWG93s0vt5tuKKoWA5kkjZ7V cYxC8xgtSDMALGlBlFbX0i69yeHwvHeeiYelR5K58XBYcZFugXOvMaJUWqfJBZpd7o0B OGaWrOF2COxU0oVBAoYBKAdTxyvlnXZhvDleQ6rcVaDzCn+6IvJ3HQoE4zexVyte5sYB Q7tnhkw0H8J6xPE0aEWaCcv52Ozwd5aAXj//8rZ4WC+1ehmuMUZAi4x7Be70MLR74Teb EoSB9QRq1LRUaQgDDLVpoa0PvAuY03MG1LFSy0gizQKTJI2qMzZU2ephziHhEoRdRmWq U6bQ== X-Gm-Message-State: ANoB5pnHjwL6oXUwTwBoemsIij76uPs6nyYSlGvzpva84eNLZTp1Bqq2 aYuOcH9LganofDIPJkd7ItPGwg== X-Google-Smtp-Source: AA0mqf5ZPcXEMtKwPfze121M3Bof+c5ifljUBFjVB9NrSrfEF7Mjl8XKULe5dHHXKGLGmF8zfOEfyQ== X-Received: by 2002:a05:6a21:2d8b:b0:a0:462f:8e3e with SMTP id ty11-20020a056a212d8b00b000a0462f8e3emr5900754pzb.55.1670551589597; Thu, 08 Dec 2022 18:06:29 -0800 (PST) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:9a82:7898:7bf4:b4f]) by smtp.gmail.com with ESMTPSA id h3-20020a17090a648300b00218ddc8048bsm233473pjj.34.2022.12.08.18.06.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Dec 2022 18:06:29 -0800 (PST) From: Douglas Anderson To: Bjorn Andersson , Dmitry Torokhov Cc: linux-arm-msm@vger.kernel.org, mka@chromium.org, Yunlong Jia , Konrad Dybcio , linux-input@vger.kernel.org, swboyd@chromium.org, Douglas Anderson , Andy Gross , Krzysztof Kozlowski , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/5] arm64: dts: qcom: sc7180: Add trogdor eDP/touchscreen regulator off-on-time Date: Thu, 8 Dec 2022 18:06:09 -0800 Message-Id: <20221208180603.v2.2.I65ac577411b017eff50e7a4fda254e5583ccdc48@changeid> X-Mailer: git-send-email 2.39.0.rc1.256.g54fd8350bd-goog In-Reply-To: <20221209020612.1303267-1-dianders@chromium.org> References: <20221209020612.1303267-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org In general, the timing diagrams for components specify a minimum time for power cycling the component. When we remove power from a device we need to let the device fully discharge and get to a quiescent state before applying power again. If we power a device on too soon then it might not have fully powered off and might be in a weird in-between / invalid state. eDP panels typically have a time that's at least 500 ms here. You can see that in Linux's panel-edp driver nearly every device specifies a "unprepare" time of at least 500 ms. This is a common minimum and the 500 ms is even in the example in the eDP spec. In Linux, the "panel-edp" driver enforces this delay for its own control of the regulator, but the "panel-edp" driver can't do anything about other control of the regulator (for instance, by the touchpanel driver). Let's add 500 ms as a board constraint for the regulator that's used for eDP/touchpanel on trogdor boards. If a given trogdor board stuffs only panels that can use a shorter time or stuff some panels that need a larger time then they can manually adjust this timing. We'll only do this minimum delay for trogdor devices with eDP (ones that use either bridge chip), not for devices with MIPI panels. MIPI panels could have similar constraints but the 500 ms isn't necessarily as standard and there are no known cases where this delay is needed. For most trogdor boards, this doesn't actually seem to affect anything when testing against shipping Linux. However, with pazqel360 it seems that this does make a difference. It seems that the touchscreen on this board _also_ needs some time for the regulator to discharge. That time is much less than 500 ms, so we'll just put the eDP panel 500 ms in there since the board constraint should be the "max" of the components. Signed-off-by: Douglas Anderson Reviewed-by: Matthias Kaehlcke --- Changes in v2: - Fix typo in commit message (Matthias) .../boot/dts/qcom/sc7180-trogdor-parade-ps8640.dtsi | 12 ++++++++++++ .../boot/dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi | 12 ++++++++++++ 2 files changed, 24 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-parade-ps8640.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-parade-ps8640.dtsi index ebd6765e2afa..e27a769f8cd4 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-parade-ps8640.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-parade-ps8640.dtsi @@ -26,6 +26,18 @@ pp3300_brij_ps8640: pp3300-brij-ps8640-regulator { }; }; +/* + * ADDITIONS TO FIXED REGULATORS DEFINED IN PARENT DEVICE TREE FILES + * + * Sort order matches the order in the parent files (parents before children). + */ + +&pp3300_dx_edp { + off-on-delay-us = <500000>; +}; + +/* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */ + &dsi0_out { remote-endpoint = <&ps8640_in>; }; diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi index 65333709e529..3188788306d0 100644 --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi @@ -7,6 +7,18 @@ #include +/* + * ADDITIONS TO FIXED REGULATORS DEFINED IN PARENT DEVICE TREE FILES + * + * Sort order matches the order in the parent files (parents before children). + */ + +&pp3300_dx_edp { + off-on-delay-us = <500000>; +}; + +/* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */ + &dsi0_out { remote-endpoint = <&sn65dsi86_in>; };