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=-3.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_NEOMUTT 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 B9537C04AB4 for ; Fri, 17 May 2019 09:09:10 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8A4EC20818 for ; Fri, 17 May 2019 09:09:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="M3NO8FbU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A4EC20818 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WRCjzBbsXbLrJdkWA2Bw4oTTyZurTrlxiZ5yxs4goeA=; b=M3NO8FbUTvaXJkUK7Ic0bs1Er fmcNqradnYnq+LtDGvA400Vj/G2G4oqDjFVkrOErnyaSsVS52C0DwCguCRhk/U9gjPGETkjAGROAA J0+b28HDa5bOY2WvcWlt3PCU6q0uGcJry2FQm3ZssA70e1L+0j+EOjIXNDKM9QziClGDJgHKJPq0+ 6fbfKmCP7s/QpGtvUv7XdayLX2ePd1FHdgMTt5NXLuUYHtCyCLOCYkF572vmHbraAOhSUHkcdA0NZ IooYHixfhOdzpXgsPOFSIAqCgrb0wz2YuwilpCUlD9jSTFAZy0ocLKIRUvvB6030yKS1jAFhy9y/g ds0jkemjw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hRYrP-0001OT-E9; Fri, 17 May 2019 09:09:03 +0000 Received: from relay4-d.mail.gandi.net ([217.70.183.196]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hRYrL-0001NO-B7 for linux-arm-kernel@lists.infradead.org; Fri, 17 May 2019 09:09:01 +0000 X-Originating-IP: 80.215.154.25 Received: from localhost (unknown [80.215.154.25]) (Authenticated sender: maxime.ripard@bootlin.com) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id E48BAE000E; Fri, 17 May 2019 09:08:45 +0000 (UTC) Date: Fri, 17 May 2019 11:08:45 +0200 From: Maxime Ripard To: Torsten Duwe Subject: Re: [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge on Teres-I Message-ID: <20190517090845.oujs33nplbaxcyun@flea> References: <20190514155911.6C0AC68B05@newverein.lst.de> <20190514160241.9EAC768C7B@newverein.lst.de> <20190515093141.41016b11@blackhole.lan> <20190516154820.GA10431@lst.de> <20190516164859.GB10431@lst.de> <20190517072738.deohh5fly4jxms7k@flea> <20190517101353.3e86d696@blackhole.lan> MIME-Version: 1.0 In-Reply-To: <20190517101353.3e86d696@blackhole.lan> User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190517_020859_680577_11F37F52 X-CRM114-Status: GOOD ( 21.08 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree , David Airlie , linux-kernel , dri-devel , Andrzej Hajda , Chen-Yu Tsai , Rob Herring , Thierry Reding , Laurent Pinchart , Daniel Vetter , Harald Geyer , Sean Paul , arm-linux , Icenowy Zheng Content-Type: multipart/mixed; boundary="===============7097544567740246424==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============7097544567740246424== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="rsrvm5wgc3yqgwap" Content-Disposition: inline --rsrvm5wgc3yqgwap Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, May 17, 2019 at 10:14:18AM +0200, Torsten Duwe wrote: > On Fri, 17 May 2019 09:27:38 +0200 > Maxime Ripard wrote: > > > On Thu, May 16, 2019 at 06:48:59PM +0200, Torsten Duwe wrote: > > > On Thu, May 16, 2019 at 09:06:41AM -0700, Vasily Khoruzhick wrote: > > > > > > > > Driver can talk to the panel over AUX channel only after t1+t3, > > > > t1 is up to 10ms, t3 is up to 200ms. > > > > > > This is after power-on. The boot loader needs to deal with this. > > > > The bootloader can deal with it, but the kernel will also need to. The > > bootloader might not be doing this because it's not been updated, the > > regulator might have been disabled between the time the kernel was > > started and the time the bridge driver probes, etc. > > No, you cannot practically switch off this voltage. It supports _all_ > the devices I mentioned. In fact, the PMIC needs to enable it initially, > and then it takes some time before the SoC can access the MMC and read > the SPL from it, just because of exactly these 3.3V. Then the boot > loader starts, and later the eDP bridge gets initialised. All these devices can be unused, disabled, or compiled as modules. > In *theory*, albeit a very daring one, I could imagine a very deep > sleep mode that can only be ended by pressing the power button, which > should still work without DCDC1. Only then, a description of the panel > would be required. But I probably missed something and even this does > not work. > > So for all current practical purposes, we can assume the Teres-I panel > to be powered properly and providing valid EDID; nothing to worry about > in software. You're creating a generic binding for all the users of that bridge, while considering only the specific case of the Teres-I. Maxime -- Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --rsrvm5wgc3yqgwap Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXN56HQAKCRDj7w1vZxhR xZh0AP4+w3VFZULGFliCxVroYWWP58DFQSolgLvZtZpZrGVBeAEA6zaZsM+cYTlD SY3UolrT94qs2Tr0bSG5TvhQwQ111wk= =giob -----END PGP SIGNATURE----- --rsrvm5wgc3yqgwap-- --===============7097544567740246424== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============7097544567740246424==--