From patchwork Wed Aug 2 17:34:47 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Praveen Paneri X-Patchwork-Id: 9877265 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7F2F360360 for ; Wed, 2 Aug 2017 17:25:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6041F2866B for ; Wed, 2 Aug 2017 17:25:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 54F6B2882B; Wed, 2 Aug 2017 17:25:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D829F28825 for ; Wed, 2 Aug 2017 17:24:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 37A6A6E004; Wed, 2 Aug 2017 17:24:59 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3BDAE6E004 for ; Wed, 2 Aug 2017 17:24:58 +0000 (UTC) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Aug 2017 10:24:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.41,312,1498546800"; d="scan'208"; a="1158301707" Received: from intel-desktop.iind.intel.com ([10.223.26.163]) by orsmga001.jf.intel.com with ESMTP; 02 Aug 2017 10:24:56 -0700 From: Praveen Paneri To: intel-gfx@lists.freedesktop.org Date: Wed, 2 Aug 2017 23:04:47 +0530 Message-Id: <1501695287-9496-1-git-send-email-praveen.paneri@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <20170802164139.kmqotezbfyhxsivu@boom> References: <20170802164139.kmqotezbfyhxsivu@boom> Cc: Praveen Paneri Subject: [Intel-gfx] [PATCH] drm/i915: enable WaDisableDopClkGating for gen9 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP This WA is required when decoupled frequencies for slice and unslice are enabled. This disables DOP clock gating for gen9. v2: enable the WA for all gen9 platforms (not just for SKL GT4 where the hang issue is originally reported) to avoid rare hangs (David) Cc: David Weinehall Reviewed-by: David Weinehall Signed-off-by: Praveen Paneri --- drivers/gpu/drm/i915/intel_pm.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 3fc42aa..e369d77 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -88,6 +88,12 @@ static void gen9_init_clock_gating(struct drm_i915_private *dev_priv) /* WaFbcHighMemBwCorruptionAvoidance:skl,bxt,kbl,cfl */ I915_WRITE(ILK_DPFC_CHICKEN, I915_READ(ILK_DPFC_CHICKEN) | ILK_DPFC_DISABLE_DUMMY0); + + if (IS_GEN9(dev_priv)) { + /* WaDisableDopClockGating */ + I915_WRITE(GEN7_MISCCPCTL, I915_READ(GEN7_MISCCPCTL) + & ~GEN7_DOP_CLOCK_GATE_ENABLE); + } } static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)