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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8E33C64ED8 for ; Mon, 27 Feb 2023 09:17:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230011AbjB0JRg (ORCPT ); Mon, 27 Feb 2023 04:17:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229700AbjB0JRX (ORCPT ); Mon, 27 Feb 2023 04:17:23 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8933F20560; Mon, 27 Feb 2023 01:12:02 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D455A60A53; Mon, 27 Feb 2023 09:12:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DE89C433D2; Mon, 27 Feb 2023 09:12:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1677489121; bh=H9jKrsi8gPdLDgwUuMAPhQE1MHq8dx8huRQwYyUlZuQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Vki/GRNngdVfc9WzkJQhE7t0949d3HaTpPXuiD4MjYGH8fevBqhVqtUUv1X6HZw4I Kza51zXzzBUNlD7XyRJjqpPMZPoFM6kIbbRuBAFRjvGs113EyD25EggAFPPQ09W567 5sJ0aB8wE/9gDmHoDIoTOF96o3cOr3p3d9edgaCcKi5OgQuz3HIzN1EHZjGy4QzIV0 9kdOQZ8fIeljWakqpJ1N2qwyvixEWrZ37TPBrXQ1erQcSm+RrJU+nCWYBWLC9ARVrQ q8KQL3T2s1qg1G41wR9ecaIRFQlPxd0gzQURuBhUIv0Vq/3P/Ho9ogn/jfDZObc1Zv cSPl1/HOLeuXg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1pWZYS-0006ZR-Ic; Mon, 27 Feb 2023 10:12:20 +0100 Date: Mon, 27 Feb 2023 10:12:20 +0100 From: Johan Hovold To: Sasha Levin Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Bjorn Andersson , Kuogee Hsieh , Dmitry Baryshkov , robdclark@gmail.com, quic_abhinavk@quicinc.com, airlied@gmail.com, daniel@ffwll.ch, swboyd@chromium.org, johan+linaro@kernel.org, quic_sbillaka@quicinc.com, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org Subject: Re: [PATCH AUTOSEL 6.2 18/60] drm/msm/dp: Remove INIT_SETUP delay Message-ID: References: <20230227020045.1045105-1-sashal@kernel.org> <20230227020045.1045105-18-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230227020045.1045105-18-sashal@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Sun, Feb 26, 2023 at 09:00:03PM -0500, Sasha Levin wrote: > From: Bjorn Andersson > > [ Upstream commit e17af1c9d861dc177e5b56009bd4f71ace688d97 ] > > During initalization of the DisplayPort controller an EV_HPD_INIT_SETUP > event is generated, but with a delay of 100 units. This delay existed to > circumvent bug in the QMP combo PHY driver, where if the DP part was > powered up before USB, the common properties would not be properly > initialized - and USB wouldn't work. > > This issue was resolved in the recent refactoring of the QMP driver, > so it's now possible to remove this delay. > > While there is still a timing dependency in the current implementation, > test indicates that it's now possible to boot with an external display > on USB Type-C and have the display power up, without disconnecting and > reconnecting the cable. > > Signed-off-by: Bjorn Andersson > Reviewed-by: Kuogee Hsieh > Patchwork: https://patchwork.freedesktop.org/patch/518729/ > Link: https://lore.kernel.org/r/20230117172951.2748456-1-quic_bjorande@quicinc.com > Signed-off-by: Dmitry Baryshkov > Signed-off-by: Sasha Levin This is not a bug fix and should not be backported. Johan