From patchwork Tue Feb 7 10:48:46 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chauhan, Madhav" X-Patchwork-Id: 9559669 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 B1D4560434 for ; Tue, 7 Feb 2017 10:48:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A2BCF28338 for ; Tue, 7 Feb 2017 10:48:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 976CE28375; Tue, 7 Feb 2017 10:48:52 +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 3167E28338 for ; Tue, 7 Feb 2017 10:48:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A24D56E656; Tue, 7 Feb 2017 10:48:51 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id C95FE6E656 for ; Tue, 7 Feb 2017 10:48:50 +0000 (UTC) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP; 07 Feb 2017 02:48:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.33,346,1477983600"; d="scan'208"; a="1091806408" Received: from unknown (HELO MCHAUHANVM.gar.corp.intel.com) ([10.109.67.20]) by orsmga001.jf.intel.com with ESMTP; 07 Feb 2017 02:48:47 -0800 From: Madhav Chauhan To: intel-gfx@lists.freedesktop.org Date: Tue, 7 Feb 2017 05:48:46 -0500 Message-Id: <1486464526-19132-1-git-send-email-madhav.chauhan@intel.com> X-Mailer: git-send-email 1.9.1 Cc: ander.conselvan.de.oliveira@intel.com, jani.nikula@intel.com Subject: [Intel-gfx] [PATCH] drm/i915/glk: CDCLK calculation changes for glk 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 As per BSPEC, valid cdclk values for glk are 79.2, 158.4, 316.8 Mhz. Practically we can achive only 99% of these cdclk values. So cdclk should be calculated for the given pixclk as per that otherwise it may lead to screen corruption for some scenarios. Signed-off-by: Madhav Chauhan --- drivers/gpu/drm/i915/intel_display.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 45e5874..2e1bfe9 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6544,9 +6544,9 @@ static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv, static int glk_calc_cdclk(int max_pixclk) { - if (max_pixclk > 2 * 158400) + if (max_pixclk > DIV_ROUND_UP(2 * 158400 * 99, 100)) return 316800; - else if (max_pixclk > 2 * 79200) + else if (max_pixclk > DIV_ROUND_UP(2 * 79200 * 99, 100)) return 158400; else return 79200;