From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EF6CC468BD for ; Sun, 9 Jun 2019 16:54:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EC966206C3 for ; Sun, 9 Jun 2019 16:54:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099299; bh=4FML/o2EtP3soLK1Ab0p0Ho+ha22Df+p/94QuNrxILI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=h8HyUohAyB98asmLElFUFRkp28bNzlE/ouEPyCK3K7SLH32LWjP7Wc2L6HUASQL52 0fWWLW4I0uEcgzkUVq4u4xmdqtJZQQaZbeep+VR2kV15tVSwGBdr/DzvhHqYXLhlwd RX/dVltUQNtD/fzbkzMMmQGezffZxeo7cqFEs0rk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731536AbfFIQy5 (ORCPT ); Sun, 9 Jun 2019 12:54:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:56872 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732720AbfFIQy4 (ORCPT ); Sun, 9 Jun 2019 12:54:56 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D093E206BB; Sun, 9 Jun 2019 16:54:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099295; bh=4FML/o2EtP3soLK1Ab0p0Ho+ha22Df+p/94QuNrxILI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d2Ru52nmAMsl1IkCn/PxR2PjogHA6KjZZL+JaTc9vCaQQTzGTv5FjtGFIXBLflRBc JWYQFlstMTk5KWRtY2NOsc3XQIxvz2opzXWy9qWimrkJfJYoRFoeLxvfrXPX3qjy7W iKyJZWQPsVmskw4UdYGUnInHzihAl/+SGQXDXcQo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Dufresne , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher Subject: [PATCH 4.9 79/83] drm/radeon: prefer lower reference dividers Date: Sun, 9 Jun 2019 18:42:49 +0200 Message-Id: <20190609164134.682755401@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164127.843327870@linuxfoundation.org> References: <20190609164127.843327870@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Christian König commit 2e26ccb119bde03584be53406bbd22e711b0d6e6 upstream. Instead of the closest reference divider prefer the lowest, this fixes flickering issues on HP Compaq nx9420. Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=108514 Suggested-by: Paul Dufresne Signed-off-by: Christian König Acked-by: Alex Deucher Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_display.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -935,12 +935,12 @@ static void avivo_get_fb_ref_div(unsigne ref_div_max = max(min(100 / post_div, ref_div_max), 1u); /* get matching reference and feedback divider */ - *ref_div = min(max(DIV_ROUND_CLOSEST(den, post_div), 1u), ref_div_max); + *ref_div = min(max(den/post_div, 1u), ref_div_max); *fb_div = DIV_ROUND_CLOSEST(nom * *ref_div * post_div, den); /* limit fb divider to its maximum */ if (*fb_div > fb_div_max) { - *ref_div = DIV_ROUND_CLOSEST(*ref_div * fb_div_max, *fb_div); + *ref_div = (*ref_div * fb_div_max)/(*fb_div); *fb_div = fb_div_max; } }