From patchwork Fri Dec 4 14:17:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak M X-Patchwork-Id: 7766331 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 [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C981A9F350 for ; Fri, 4 Dec 2015 08:43:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0ED4B204A0 for ; Fri, 4 Dec 2015 08:43:43 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 4FFF420498 for ; Fri, 4 Dec 2015 08:43:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D1D806EDE7; Fri, 4 Dec 2015 00:43:41 -0800 (PST) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id 23ABB6EDE7 for ; Fri, 4 Dec 2015 00:43:40 -0800 (PST) Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga101.fm.intel.com with ESMTP; 04 Dec 2015 00:43:40 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,380,1444719600"; d="scan'208";a="864515860" Received: from mdeepakubuntudesk01-desktop.iind.intel.com ([10.223.26.119]) by orsmga002.jf.intel.com with ESMTP; 04 Dec 2015 00:43:38 -0800 From: Deepak M To: intel-gfx@lists.freedesktop.org Date: Fri, 4 Dec 2015 19:47:39 +0530 Message-Id: <1449238659-12473-3-git-send-email-m.deepak@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449238659-12473-1-git-send-email-m.deepak@intel.com> References: <1449238659-12473-1-git-send-email-m.deepak@intel.com> Cc: Deepak M Subject: [Intel-gfx] [PATCH 3/3] drm/i915: Use the ceil value for the additional clk divider 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-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00, DATE_IN_FUTURE_03_06, RCVD_IN_DNSWL_MED,T_RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=no 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 Additional clock value divider should use the ceil value of the calulation to get the correct divider value. Signed-off-by: Deepak M --- drivers/gpu/drm/i915/intel_dsi_pll.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c index cb3cf39..1322a71 100644 --- a/drivers/gpu/drm/i915/intel_dsi_pll.c +++ b/drivers/gpu/drm/i915/intel_dsi_pll.c @@ -454,7 +454,7 @@ static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port) dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2; /* Max possible output of clock is 39.5 MHz, program value -1 */ - divider = (dsi_rate / BXT_MAX_VAR_OUTPUT_KHZ) - 1; + divider = DIV_ROUND_UP(dsi_rate, BXT_MAX_VAR_OUTPUT_KHZ) - 1; tmp |= BXT_MIPI_ESCLK_VAR_DIV(port, divider); /*