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=-4.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED,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 F2D07C2F3A6 for ; Mon, 21 Jan 2019 13:25:35 +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 B99FB2085A for ; Mon, 21 Jan 2019 13:25:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="WEbneVjA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B99FB2085A 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=jq3x5IRjqlh9gssh3HcOrIZb2+xuwnvlm3nfDwm6ewA=; b=WEbneVjAl9pQiyittGaZa/IVF JVQYHs/0FxcLp+4eOQe38+ZqAxnkRadr1Vr5C3cDLhR5EGOJrtZeCJ9WyI2rFmzefmH5vm3X2vaF5 ZZSUvFU3AyQzECh09bKVTfbpiJ5WTQCSwNqyA/Y8UrkPf4SCZc2IEIT8wiATffLAELKGAxMMlTSmG LPBjMKpwoM7inTPt5lBoMokQvC0ViB0/UxnaKMZ26J84jUkqp+X6mtfe6x4fSNIz6dyH8ec4ABxWD 7vEpgijFQtpyVnNNwROSfJC3B77hcEIeobdXSpLPukZ6h0GVmoVGb1k+PU8Xox8+jM8wNt+tY47uT Sso5CR8bA==; 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 1glZa0-0007pV-7Q; Mon, 21 Jan 2019 13:25:32 +0000 Received: from mail.bootlin.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1glZZx-0007pB-EO for linux-arm-kernel@lists.infradead.org; Mon, 21 Jan 2019 13:25:31 +0000 Received: by mail.bootlin.com (Postfix, from userid 110) id 1E4B4207B2; Mon, 21 Jan 2019 14:25:27 +0100 (CET) Received: from localhost (unknown [185.94.189.187]) by mail.bootlin.com (Postfix) with ESMTPSA id CACA12078C; Mon, 21 Jan 2019 14:25:16 +0100 (CET) Date: Mon, 21 Jan 2019 14:25:17 +0100 From: Maxime Ripard To: Priit Laes Subject: Re: [linux-sunxi] Re: HDMI/DVI spurious failure Message-ID: <20190121132517.iv2v3hug4uihefnk@flea> References: <20190114132934.rywqqtjarbf6fgcr@plaes.org> <20190115094951.e7jnjpibj5tcp5pz@flea> <20190116075854.o2kme5nxq5kckwem@plaes.org> <20190116192442.qz4xi2ky6axgiyvg@flea> <20190116203516.s7pisy4miaclo63u@plaes.org> <20190117113340.ydszal5c3nlrqr47@flea> <20190118101053.gkxpfymsjzw3ptxf@plaes.org> <20190118140418.m5mliyvddfdfju3v@flea> <20190118145126.mpjz5t5hjqqpgzys@plaes.org> MIME-Version: 1.0 In-Reply-To: <20190118145126.mpjz5t5hjqqpgzys@plaes.org> User-Agent: NeoMutt/20180716 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190121_052529_754301_5E04B0DA X-CRM114-Status: GOOD ( 26.18 ) 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: linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com, Chen-Yu Tsai , Jonathan Liu , dri-devel@lists.freedesktop.org Content-Type: multipart/mixed; boundary="===============4352959909304121907==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============4352959909304121907== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="pwfuitnpzretg3l6" Content-Disposition: inline --pwfuitnpzretg3l6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jan 18, 2019 at 02:51:26PM +0000, Priit Laes wrote: > On Fri, Jan 18, 2019 at 03:04:18PM +0100, Maxime Ripard wrote: > > On Fri, Jan 18, 2019 at 10:10:53AM +0000, Priit Laes wrote: > > > > > > > > It doesn't look related to the clock rate itself, since it = doesn't > > > > > > > > change between the two cases. However, in one case the DDC = clock is > > > > > > > > enabled and in the other it's disabled. > > > > > > > >=20 > > > > > > > > Was it taken at the same time? Maybe you can try with that = patch? > > > > > > > > http://code.bulix.org/z7jmkm-555344?raw > > > > > > >=20 > > > > > > > Thanks, after doing ~50+ boots I haven't seen a single failur= e. > > > > > > >=20 > > > > > > > Previously I had following failure cases which are now both f= ixed: > > > > > > >=20 > > > > > > > a) Linux without u-boot HDMI, where one in every 6-7 boots fa= iled. > > > > > > > b) u--boot with hdmi enabled switching to simplefb and then s= witching > > > > > > > to kms, where previously all boots ended up with garbled scre= en. > > > > > >=20 > > > > > > So it's not really a fix, but it really looks like the clock is= not > > > > > > enabled when it should. > > > > > >=20 > > > > > > Can you describe your test scenario a bit more? What are you do= ing > > > > > > exactly, just booting? When do you start using the display? Whe= n did > > > > > > you capture the debugfs output that you pasted? > > > > >=20 > > > > > Display is already connected via HDMI to the board. I don't really > > > > > remove it, I just boot the device and let it start Xorg. > > > > > Meanwhile I just ssh into the device and capture debugfs output. > > > > > See my 3 testing scenarios below. > > > > >=20 > > > > > Kernel also includes one extra patch to fall back to DDC, in case= HPD > > > > > fails. Mostly the same I already submitted last November [1]. > > > >=20 > > > > Do you have the same issue without that patch? > > >=20 > > > Can't really test this display without this patch and I do not have o= ther > > > HDMI/DVI screens. And this issue does not happen with other HDMI disp= lays > > > that I have here. > >=20 > > Can't you just force the monitor to be reported as present? It's not > > great and we don't want to merge it, but that would allow you to test > > that setup without too many interferences. >=20 > Baseline is clean u-boot / linux. U-boot does not detect/enable display. >=20 > 1) Booting Linux with drm.debug=3D0xe >=20 > * Linux does not detect/enable display >=20 > 2) Booting with drm.debug=3D0xe video=3DHDMI-A-1:640x480@60e >=20 > * Linux detects display, but display is garbled, and proper edid data is = detected: >=20 > [snip] > pll-video1 0 0 0 327000000 0= 0 50000 > pll-video1-2x 0 0 0 654000000 0= 0 50000 > hdmi-tmds 0 0 0 25153846 0= 0 50000 > hdmi-ddc 0 0 0 89835 0= 0 50000 > [/snip] >=20 > 3) Booting with drm.debug=3D0xe video=3DHDMI-A-1:640x480@60e > And also one extra patch for Linux where HDMI DDC clock marked as critical >=20 > Linux detects and initializes display properly: > [snip] > pll-video1 1 1 0 327000000 0= 0 50000 > pll-video1-2x 1 1 0 654000000 0= 0 50000 > hdmi-tmds 1 1 0 25153846 0= 0 50000 > hdmi-ddc 1 1 0 89835 0= 0 50000 > [/snip] I guess you'll need to track down when the hdmi-tmds and hdmi-ddc are enabled and disabled, and if it makes sense :/ Maxime --=20 Maxime Ripard, Bootlin Embedded Linux and Kernel engineering https://bootlin.com --pwfuitnpzretg3l6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCXEXIPQAKCRDj7w1vZxhR xcL9AP90HKorMjZWKBoBqwq4XAdHAARaeew1QhNIgEON/f+xqwEAzD+7Pkh/RHY9 MtqiJ6wLMZsP5DEfmy/dv4x3d9lvOQw= =JEgz -----END PGP SIGNATURE----- --pwfuitnpzretg3l6-- --===============4352959909304121907== 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 --===============4352959909304121907==--