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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A97FC433F5 for ; Wed, 17 Nov 2021 22:49:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 454E5613D0 for ; Wed, 17 Nov 2021 22:49:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241421AbhKQWwU (ORCPT ); Wed, 17 Nov 2021 17:52:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241434AbhKQWwH (ORCPT ); Wed, 17 Nov 2021 17:52:07 -0500 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16CCCC061570 for ; Wed, 17 Nov 2021 14:49:06 -0800 (PST) Received: by mail-pl1-x62e.google.com with SMTP id q17so3469665plr.11 for ; Wed, 17 Nov 2021 14:49:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rpv3ppQp4AdrKrqKBlCi3lv1TW7GOvkKLKXPxTB7n5Y=; b=CmCe9x1evLqmgJ2tkD2ei5zZtVLnugfocj/BWL7RE6407XI6b4ZrG/ZlsrU08i+PTk U6Xo63RXOuh7ZShFvqCihtigQwrvJUIoqc93GEZiSpBCmuFKYsC8uC+WQWJo0s7PUjfD 6cYU9y1AbXPsd0nSfQYWeT7eD3QkH//b5Sods= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=rpv3ppQp4AdrKrqKBlCi3lv1TW7GOvkKLKXPxTB7n5Y=; b=HRfNbnwQv+pXdgrHg/2YWltTcqXkX3fGgxFT+1BOXE8NoOzDJMJwSY4+OdYFFWPTTU WUzueFi7riritpY1FdDH2HhX144xMI2vbJ1QBDsXqn7dh+uksSesInY4p4v3FnZev6ZE izggIBKPHIwt7ehfBrtWoYU033FKfiV4YwWg6NipOL1DfHj/hWlzL6XylsClTYMekX7T tJQ2YD3YrARWhyQjJRBr3JHq208UVyoRGqWfja3PTTEfRjaoM1XnQ5zLbf7beTVSs9nd ZY/Rx6pqsVLms+5U9EQUjMy3PfzhdWzL1P0Rfcjb5E2lJOUyBGB+6g0qtFAwL9M/GGGZ Bs3A== X-Gm-Message-State: AOAM532gYwDUEY3wXioI8g5MtmNRbdS+TK/LYE8Z9dxi8G9eGi4U2vs4 uXsR2UKcS3i+GY82SypNATND1g== X-Google-Smtp-Source: ABdhPJyLA0GlFJYLVXLkAb23Pd6HZXVzIX/Db1U2jnd4GET4hbncySrNQFQD8cVcGqeHii1Rq+eQxw== X-Received: by 2002:a17:90a:2843:: with SMTP id p3mr4320482pjf.176.1637189345652; Wed, 17 Nov 2021 14:49:05 -0800 (PST) Received: from localhost ([2620:15c:202:201:896b:df38:4eae:c568]) by smtp.gmail.com with UTF8SMTPSA id w189sm620772pfd.164.2021.11.17.14.49.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Nov 2021 14:49:05 -0800 (PST) From: Brian Norris To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Cc: "Kristian H . Kristensen" , linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, Dmitry Torokhov , Doug Anderson , Andrzej Hajda , Rob Clark , linux-input@vger.kernel.org, Rob Clark , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, Brian Norris Subject: [PATCH v2 0/2] drm: Support input-boosted panel self-refresh exit Date: Wed, 17 Nov 2021 14:48:39 -0800 Message-Id: <20211117224841.3442482-1-briannorris@chromium.org> X-Mailer: git-send-email 2.34.0.rc1.387.gb447b232ab-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A variety of applications have found it useful to listen to user-initiated input events to make decisions within a DRM driver, given that input events are often the first sign that we're going to start doing latency-sensitive activities: * Panel self-refresh: software-directed self-refresh (e.g., with Rockchip eDP) is especially latency sensitive. In some cases, it can take 10s of milliseconds for a panel to exit self-refresh, which can be noticeable. Rockchip RK3399 Chrome OS systems have always shipped with an input_handler boost, that preemptively exits self-refresh whenever there is input activity. * GPU drivers: on GPU-accelerated desktop systems, we may need to render new frames immediately after user activity. Powering up the GPU can take enough time that it is worthwhile to start this process as soon as there is input activity. Many Chrome OS systems also ship with an input_handler boost that powers up the GPU. I implement the first bullet in this series, and I also compared with some out-of-tree patches for the second, to ensure this could be useful there too. Past work on upstreaming a variety of Chromebook display patches got held up for this particular feature, as there was some desire to make it a bit more generic, for one. See the latest here: https://lore.kernel.org/all/20180405095000.9756-25-enric.balletbo@collabora.com/ [PATCH v6 24/30] drm/rockchip: Disable PSR on input events I significantly rewrote this to adapt it to the new common drm_self_refresh_helpers and to add a new drm_input_helper thin library, so I only carry my own authorship on this series. Admittedly, this "drm_input_helper" library is barely DRM-specific at all, except that all display- and GPU-related input-watchers are likely to want to watch similar device behavior (unlike, say, rfkill or led input_handler code). The approximate consensus so far seems to be that (a) this isn't much code; if we need it for other subsystems (like, cpufreq-boost), it's easy to implement similar logic (b) input subsystem maintainers think the existing input_handler abstraction is good enough So, I keep the thin input helper in drivers/gpu/drm/. v1: https://lore.kernel.org/all/20211103234018.4009771-1-briannorris@chromium.org/ Changes in v2: - Honor CONFIG_INPUT dependency, via new CONFIG_DRM_INPUT_HELPER - Remove void*; users should use container_of() - Document the callback context - Delay PSR re-entry, when already disabled - Allow default configuration via Kconfig and modparam - really CC dri-devel@lists.freedesktop.org (oops!) Brian Norris (2): drm/input_helper: Add new input-handling helper drm/self_refresh: Disable self-refresh on input events drivers/gpu/drm/Kconfig | 22 ++++ drivers/gpu/drm/Makefile | 2 + drivers/gpu/drm/drm_input_helper.c | 143 ++++++++++++++++++++++ drivers/gpu/drm/drm_self_refresh_helper.c | 98 ++++++++++++--- include/drm/drm_input_helper.h | 41 +++++++ 5 files changed, 292 insertions(+), 14 deletions(-) create mode 100644 drivers/gpu/drm/drm_input_helper.c create mode 100644 include/drm/drm_input_helper.h -- 2.34.0.rc1.387.gb447b232ab-goog