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=-8.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT 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 02BCDC0044C for ; Mon, 29 Oct 2018 16:16:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B068D205F4 for ; Mon, 29 Oct 2018 16:16:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=poorly.run header.i=@poorly.run header.b="b1cmsvRG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B068D205F4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=poorly.run Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727799AbeJ3BGK (ORCPT ); Mon, 29 Oct 2018 21:06:10 -0400 Received: from mail-yw1-f66.google.com ([209.85.161.66]:45802 "EHLO mail-yw1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727629AbeJ3BGJ (ORCPT ); Mon, 29 Oct 2018 21:06:09 -0400 Received: by mail-yw1-f66.google.com with SMTP id i185-v6so3586541ywa.12 for ; Mon, 29 Oct 2018 09:16:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=poorly.run; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=uuvv4KbWEcHka5r4P5bFlludWOvRK7kQkTjszpNysi4=; b=b1cmsvRGIzQYAgNNO4vJzXtmOnhkEfihfj4HqyaQdwm0dEJ5Ckmq0sEozxG/82CcEG e8IPCtZozwWzBY1P7/Z2pAvHhkBdB42Xzo7gsk0rNL3aevzuRe0WKWk8DB2XPW5l2JIn hHEKSr99KpOxqA48pSNxA1R8vgQrPUYZVjtcuVOzLQS6iyq35a6zV0aXXMZ05j3KzK6u LkumFIq2OX/hmPucbboSvIVblYfUidojx3dvik+HgSOAtx1UEtmrgYV58aKaUXX3ndhc T91sbfdnwXBB+KPwrdi8H7TJ83nuQUYaSMcI/ERdJ3Ks0e1UDEdrjjxBCkUoXPJqDL18 cPug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=uuvv4KbWEcHka5r4P5bFlludWOvRK7kQkTjszpNysi4=; b=YXDfcBTzjKEAkNUfY4JhA7nBZDyIW75OhqggmOR3x8rIpB6j9Iid1gqQzVSBgcoGvq 0xdDHT393+bkjceCvqDnTQjG98J5+K5BPCkHWEdXaDRqhpilsCILK50blypUNRbThLsf VPeyU3yoFmC8tzaF8RwNNlSXV9VThu65az8WdE4BWzkKgzAl3Ge51AwGB7iqAf91Nb6F 7mypIIbdn4Uf1xjG9KRAdZc8/F+d2vjf/xEHQ+gAvS7uwyX6hnJXUiTvE1ViO1Op4c5C SFI9oaLOoYffc/bVDVH7cclZKNrvF9t8/5NJ1oJKinpLpBnUnVWGfD9dcAfLdtZvaPfV TKnQ== X-Gm-Message-State: AGRZ1gIezQoTfjbPI+o2H7iDkhynbtG2TS2Xrf6lSDmQ/ysLAyKkJtgp /fd1RbQ8rd8scgh2wdQHCsiCiQ== X-Google-Smtp-Source: AJdET5dwwHUEdmq6eA1ccZTnTH6iDm9/QGfV+yVC8MaDbTbAZSaBFxkuJ1BzPeN4dHWEwfksO3pBXA== X-Received: by 2002:a81:61c1:: with SMTP id v184-v6mr2102102ywb.173.1540829812860; Mon, 29 Oct 2018 09:16:52 -0700 (PDT) Received: from localhost ([2620:0:1013:11:ad55:b1db:adfe:3b9f]) by smtp.gmail.com with ESMTPSA id g21-v6sm1525986ywk.5.2018.10.29.09.16.51 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 29 Oct 2018 09:16:51 -0700 (PDT) Date: Mon, 29 Oct 2018 12:16:51 -0400 From: Sean Paul To: Douglas Anderson Cc: Sean Paul , Thierry Reding , Sandeep Panda , linux-arm-msm@vger.kernel.org, Laurent Pinchart , jsanka@codeaurora.org, ryandcase@chromium.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Rob Herring , David Airlie , Mark Rutland Subject: Re: [PATCH v2 1/6] dt-bindings: drm/panel: simple: Add no-hpd property Message-ID: <20181029161651.GW154160@art_vandelay> References: <20181025222134.174583-1-dianders@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181025222134.174583-1-dianders@chromium.org> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 25, 2018 at 03:21:29PM -0700, Douglas Anderson wrote: > Some eDP panels that are designed to be always connected to a board > use their HPD signal to signal that they've finished powering on and > they're ready to be talked to. > > However, for various reasons it's possible that the HPD signal from > the panel isn't actually hooked up. In the case where the HPD isn't > hooked up you can look at the timing diagram on the panel datasheet > and insert a delay for the maximum amount of time that the HPD might > take to come up. > > Let's add a property in the device tree for this concept. > > Signed-off-by: Douglas Anderson Thanks for the series, Doug, I've applied it all to drm-misc-next-fixes for 4.20. Sean > Reviewed-by: Sean Paul > Reviewed-by: Rob Herring > --- > > Changes in v2: None > > .../devicetree/bindings/display/panel/simple-panel.txt | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/panel/simple-panel.txt b/Documentation/devicetree/bindings/display/panel/simple-panel.txt > index 45a457ad38f0..b2b872c710f2 100644 > --- a/Documentation/devicetree/bindings/display/panel/simple-panel.txt > +++ b/Documentation/devicetree/bindings/display/panel/simple-panel.txt > @@ -11,6 +11,9 @@ Optional properties: > - ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing > - enable-gpios: GPIO pin to enable or disable the panel > - backlight: phandle of the backlight device attached to the panel > +- no-hpd: This panel is supposed to communicate that it's ready via HPD > + (hot plug detect) signal, but the signal isn't hooked up so we should > + hardcode the max delay from the panel spec when powering up the panel. > > Example: > > -- > 2.19.1.568.g152ad8e336-goog > -- Sean Paul, Software Engineer, Google / Chromium OS