From patchwork Tue Jul 9 23:00:31 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 2825463 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CDD139F756 for ; Tue, 9 Jul 2013 23:00:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CEF5B20121 for ; Tue, 9 Jul 2013 23:00:47 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 8596E200FF for ; Tue, 9 Jul 2013 23:00:46 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7A2F7E5C1A for ; Tue, 9 Jul 2013 16:00:46 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mail-pa0-f50.google.com (mail-pa0-f50.google.com [209.85.220.50]) by gabe.freedesktop.org (Postfix) with ESMTP id B3F26E5C1A; Tue, 9 Jul 2013 16:00:35 -0700 (PDT) Received: by mail-pa0-f50.google.com with SMTP id fb1so6065846pad.9 for ; Tue, 09 Jul 2013 16:00:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:x-mailer; bh=GIbPNrBouf8c0LR3HauCTqZ3H5RsGFWMjnqIf/td/jo=; b=zWYAsmLpf5Dcskx4kNfsjJ1asT/3kMKjb0qSUgrIaOknnDvCAcRkmTwLdfzbzmPsNt BM0/MKFxu8wkwcL8jQbqdRJlXKTkCWx8GW+5QlNP7rweNPpw4ZqMMRQmdjkg4HRRk1sV hNY183NOvQCZS8ibhVUal8VbUF8qtxZSUfGu32/KB60fZP60/0uvtrLLLpiXBYCfdgcH YTIEhwm35CWPjIYiD03jBnJgA3y/l5yFbqFmMo1t1feYQ/mlEXqzzjsteW60vst8KPwR W2QfayfsIj+ReS5R0Y0SO9/biJh6KTckI1IUBrHu93CFCPV4hRBEjfWEedQ6+5YWbTOk 6VZQ== X-Received: by 10.68.201.6 with SMTP id jw6mr22462387pbc.202.1373410835495; Tue, 09 Jul 2013 16:00:35 -0700 (PDT) Received: from localhost (108-223-40-66.lightspeed.sntcca.sbcglobal.net. [108.223.40.66]) by mx.google.com with ESMTPSA id pl9sm30391514pbc.5.2013.07.09.16.00.33 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 09 Jul 2013 16:00:34 -0700 (PDT) From: Guenter Roeck To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Tue, 9 Jul 2013 16:00:31 -0700 Message-Id: <1373410831-1347-1-git-send-email-linux@roeck-us.net> X-Mailer: git-send-email 1.7.9.7 Cc: David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org, Guenter Roeck , Mika Kuoppala Subject: [Intel-gfx] [PATCH v2] Partially revert "drm/i915: unconditionally use mt forcewake on hsw/ivb" X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+patchwork-intel-gfx=patchwork.kernel.org@lists.freedesktop.org X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch partially reverts commit 36ec8f877481449bdfa072e6adf2060869e2b970 for IvyBridge CPUs. The original commit results in repeated 'Timed out waiting for forcewake old ack to clear' messages on a Supermicro C7H61 board (BIOS version 2.00 and 2.00b) with i7-3770K CPU. It ultimately results in a hangup if the system is highly loaded. Reverting the commit for IvyBridge CPUs fixes the issue. Issue a warning if the CPU is IvyBridge and mt forcewake is disabled, since this condition can result in secondary issues. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60541 Cc: Jesse Barnes Cc: Daniel Vetter Cc: Mika Kuoppala Signed-off-by: Guenter Roeck --- v2: Only revert patch for Ivybridge CPUs Issue info message if mt forcewake is disabled on Ivybridge drivers/gpu/drm/i915/intel_pm.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index aa01128..0392c28 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4510,9 +4510,38 @@ void intel_gt_init(struct drm_device *dev) if (IS_VALLEYVIEW(dev)) { dev_priv->gt.force_wake_get = vlv_force_wake_get; dev_priv->gt.force_wake_put = vlv_force_wake_put; - } else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) { + } else if (IS_HASWELL(dev)) { dev_priv->gt.force_wake_get = __gen6_gt_force_wake_mt_get; dev_priv->gt.force_wake_put = __gen6_gt_force_wake_mt_put; + } else if (IS_IVYBRIDGE(dev)) { + u32 ecobus; + + /* IVB configs may use multi-threaded forcewake */ + + /* A small trick here - if the bios hasn't configured + * MT forcewake, and if the device is in RC6, then + * force_wake_mt_get will not wake the device and the + * ECOBUS read will return zero. Which will be + * (correctly) interpreted by the test below as MT + * forcewake being disabled. + */ + mutex_lock(&dev->struct_mutex); + __gen6_gt_force_wake_mt_get(dev_priv); + ecobus = I915_READ_NOTRACE(ECOBUS); + __gen6_gt_force_wake_mt_put(dev_priv); + mutex_unlock(&dev->struct_mutex); + + if (ecobus & FORCEWAKE_MT_ENABLE) { + dev_priv->gt.force_wake_get = + __gen6_gt_force_wake_mt_get; + dev_priv->gt.force_wake_put = + __gen6_gt_force_wake_mt_put; + } else { + DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n"); + DRM_INFO("when using vblank-synced partial screen updates.\n"); + dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get; + dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put; + } } else if (IS_GEN6(dev)) { dev_priv->gt.force_wake_get = __gen6_gt_force_wake_get; dev_priv->gt.force_wake_put = __gen6_gt_force_wake_put;