From patchwork Fri Nov 18 15:09:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kumar, Mahesh" X-Patchwork-Id: 9436875 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 8AAA860238 for ; Fri, 18 Nov 2016 15:10:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7F3E62993B for ; Fri, 18 Nov 2016 15:10:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 73EB82993E; Fri, 18 Nov 2016 15:10:31 +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 2170C2993D for ; Fri, 18 Nov 2016 15:10:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 78CC66E9E6; Fri, 18 Nov 2016 15:10:30 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6C7416E9E6 for ; Fri, 18 Nov 2016 15:10:28 +0000 (UTC) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga102.jf.intel.com with ESMTP; 18 Nov 2016 07:10:28 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,510,1473145200"; d="scan'208";a="902935598" Received: from kumarmah-desk.iind.intel.com ([10.223.26.44]) by orsmga003.jf.intel.com with ESMTP; 18 Nov 2016 07:10:25 -0800 From: Mahesh Kumar To: intel-gfx@lists.freedesktop.org Date: Fri, 18 Nov 2016 20:39:29 +0530 Message-Id: <20161118150934.29851-4-mahesh1.kumar@intel.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161118150934.29851-1-mahesh1.kumar@intel.com> References: <20161118150934.29851-1-mahesh1.kumar@intel.com> Cc: paulo.r.zanoni@intel.com, maarten.lankhorst@intel.com Subject: [Intel-gfx] [PATCH v5 3/8] drm/i915/kbl: IPC workaround for kabylake 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 IPC (Isoch Priority Control) may cause underflows. KBL WA: When IPC is enabled, watermark latency values must be increased by 4us across all levels. This brings level 0 up to 6us. Signed-off-by: Mahesh Kumar Reviewed-by: Paulo Zanoni --- drivers/gpu/drm/i915/intel_pm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 7090a7c..df39b50 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3599,6 +3599,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv, return 0; } + /* IPC WA for kabylake */ + if (IS_KABYLAKE(dev_priv) && dev_priv->ipc_enabled) + latency += 4; + y_tiled = fb->modifier == I915_FORMAT_MOD_Y_TILED || fb->modifier == I915_FORMAT_MOD_Yf_TILED; x_tiled = fb->modifier == I915_FORMAT_MOD_X_TILED;