From patchwork Tue Oct 21 10:52:16 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dheeraj Jamwal X-Patchwork-Id: 5119001 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 63746C11AC for ; Tue, 21 Oct 2014 11:45:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6FD8F2010F for ; Tue, 21 Oct 2014 11:45:54 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A427A200E8 for ; Tue, 21 Oct 2014 11:45:53 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 268EB10D4; Tue, 21 Oct 2014 11:08:33 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp2.linuxfoundation.org (smtp2.linux-foundation.org [172.17.192.36]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 2DA0D10B7 for ; Tue, 21 Oct 2014 11:08:32 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by smtp2.linuxfoundation.org (Postfix) with ESMTP id D7EE51DD16 for ; Tue, 21 Oct 2014 11:08:31 +0000 (UTC) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 21 Oct 2014 04:07:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,761,1406617200"; d="scan'208";a="617796993" Received: from ubuntu-desktop.png.intel.com ([10.221.122.25]) by fmsmga002.fm.intel.com with ESMTP; 21 Oct 2014 04:07:28 -0700 From: Dheeraj Jamwal To: ltsi-dev@lists.linuxfoundation.org Date: Tue, 21 Oct 2014 18:52:16 +0800 Message-Id: <1413889294-31328-537-git-send-email-dheerajx.s.jamwal@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> References: <1413889294-31328-1-git-send-email-dheerajx.s.jamwal@intel.com> X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Subject: [LTSI-dev] [PATCH 0536/1094] drm/i915: don't schedule force_wake_timer at gen6_read X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Paulo Zanoni So far force_wake_timer was only used by gen6_gt_force_wake_put. Since we always had balanced gen6_gt_force_wake_get/put calls, we could guarantee balanced calls to intel_runtime_pm_get/put. Commit 8232644ccf099548710843e97360a3fcd6d28e04, "drm/i915: Convert the forcewake worker into a timer func" started scheduling the force_wake_timer at gen6_read, which resulted in an unbalanced runtime_pm refcount. So this commit just reverts to the old behavior until we can find a proper way to used delayed force_wake from the register read/write macros without leaving the runtime_pm refcounts unbalanced and without runtime suspending the driver while forcewake is active. Testcase: igt/pm_pc8/rte Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76544 Signed-off-by: Paulo Zanoni Signed-off-by: Daniel Vetter (cherry picked from commit aa0b3b5bb8768c1a6a6788869d9c7015eae7e80c) Signed-off-by: Dheeraj Jamwal --- drivers/gpu/drm/i915/intel_uncore.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index c3832d9..c47853b 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -550,11 +550,12 @@ gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \ NEEDS_FORCE_WAKE((dev_priv), (reg))) { \ dev_priv->uncore.funcs.force_wake_get(dev_priv, \ FORCEWAKE_ALL); \ - dev_priv->uncore.forcewake_count++; \ - mod_timer_pinned(&dev_priv->uncore.force_wake_timer, \ - jiffies + 1); \ + val = __raw_i915_read##x(dev_priv, reg); \ + dev_priv->uncore.funcs.force_wake_put(dev_priv, \ + FORCEWAKE_ALL); \ + } else { \ + val = __raw_i915_read##x(dev_priv, reg); \ } \ - val = __raw_i915_read##x(dev_priv, reg); \ REG_READ_FOOTER; \ }