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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT 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 3849BC43381 for ; Wed, 20 Feb 2019 23:37:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0D6C62146E for ; Wed, 20 Feb 2019 23:37:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726919AbfBTXhC (ORCPT ); Wed, 20 Feb 2019 18:37:02 -0500 Received: from anholt.net ([50.246.234.109]:52450 "EHLO anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726070AbfBTXhC (ORCPT ); Wed, 20 Feb 2019 18:37:02 -0500 Received: from localhost (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id 6346C10A2D21; Wed, 20 Feb 2019 15:37:01 -0800 (PST) X-Virus-Scanned: Debian amavisd-new at anholt.net Received: from anholt.net ([127.0.0.1]) by localhost (kingsolver.anholt.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 3PyzK8KvN_dJ; Wed, 20 Feb 2019 15:36:59 -0800 (PST) Received: from eliezer.anholt.net (localhost [127.0.0.1]) by anholt.net (Postfix) with ESMTP id C8DB710A2ADF; Wed, 20 Feb 2019 15:36:59 -0800 (PST) Received: by eliezer.anholt.net (Postfix, from userid 1000) id 0E9242FE464E; Wed, 20 Feb 2019 15:36:59 -0800 (PST) From: Eric Anholt To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, david.emett@broadcom.com, thomas.spurden@broadcom.com, Eric Anholt Subject: [PATCH v3 3/3] drm/v3d: Make sure the GPU is on when measuring clocks. Date: Wed, 20 Feb 2019 15:36:58 -0800 Message-Id: <20190220233658.986-3-eric@anholt.net> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190220233658.986-1-eric@anholt.net> References: <20190220233658.986-1-eric@anholt.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org You'll get garbage measurements if the registers always read back 0xdeadbeef Signed-off-by: Eric Anholt --- drivers/gpu/drm/v3d/v3d_debugfs.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c index eb2b2d2f8553..a24af2d2f574 100644 --- a/drivers/gpu/drm/v3d/v3d_debugfs.c +++ b/drivers/gpu/drm/v3d/v3d_debugfs.c @@ -187,6 +187,11 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) uint32_t cycles; int core = 0; int measure_ms = 1000; + int ret; + + ret = pm_runtime_get_sync(v3d->dev); + if (ret < 0) + return ret; if (v3d->ver >= 40) { V3D_CORE_WRITE(core, V3D_V4_PCTR_0_SRC_0_3, @@ -210,6 +215,9 @@ static int v3d_measure_clock(struct seq_file *m, void *unused) cycles / (measure_ms * 1000), (cycles / (measure_ms * 100)) % 10); + pm_runtime_mark_last_busy(v3d->dev); + pm_runtime_put_autosuspend(v3d->dev); + return 0; } -- 2.20.1