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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 B2394C5519F for ; Sun, 29 Nov 2020 22:12:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 779B42078D for ; Sun, 29 Nov 2020 22:12:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727845AbgK2WMV (ORCPT ); Sun, 29 Nov 2020 17:12:21 -0500 Received: from asavdk3.altibox.net ([109.247.116.14]:41348 "EHLO asavdk3.altibox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725950AbgK2WMV (ORCPT ); Sun, 29 Nov 2020 17:12:21 -0500 Received: from ravnborg.org (unknown [188.228.123.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by asavdk3.altibox.net (Postfix) with ESMTPS id 0A07F20034; Sun, 29 Nov 2020 23:11:34 +0100 (CET) Date: Sun, 29 Nov 2020 23:11:32 +0100 From: Sam Ravnborg To: Douglas Anderson Cc: Thierry Reding , robdclark@chromium.org, David Airlie , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Rob Herring Subject: Re: [PATCH v4 2/5] drm: panel: simple: Defer unprepare delay till next prepare to shorten it Message-ID: <20201129221132.GI1162850@ravnborg.org> References: <20201109170018.v4.1.Icaa86f0a4ca45a9a7184da4bc63386b29792d613@changeid> <20201109170018.v4.2.I06a95d83e7fa1bd919c8edd63dacacb5436e495a@changeid> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201109170018.v4.2.I06a95d83e7fa1bd919c8edd63dacacb5436e495a@changeid> X-CMAE-Score: 0 X-CMAE-Analysis: v=2.3 cv=Ibmpp1ia c=1 sm=1 tr=0 a=S6zTFyMACwkrwXSdXUNehg==:117 a=S6zTFyMACwkrwXSdXUNehg==:17 a=kj9zAlcOel0A:10 a=cm27Pg_UAAAA:8 a=1W7J8uJR8bNfhs70qOMA:9 a=CjuIK1q_8ugA:10 a=xmb-EsYY8bH0VWELuYED:22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Douglas, On Mon, Nov 09, 2020 at 05:00:56PM -0800, Douglas Anderson wrote: > It is believed that all of the current users of the "unprepare" delay > don't actually need to wait the amount of time specified directly in > the unprepare phase. The purpose of the delay that's specified is to > allow the panel to fully power off so that we don't try to power it > back on before it's managed to full power down. > > Let's use this observation to avoid the fixed delay that we currently > have. Instead of delaying, we'll note the current time when the > unprepare happens. If someone then tries to prepare the panel later > and not enough time has passed, we'll do the delay before starting the > prepare phase. > > Signed-off-by: Douglas Anderson Applied to drm-misc-next. Sam