From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932278AbaAFWjD (ORCPT ); Mon, 6 Jan 2014 17:39:03 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:47571 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932193AbaAFWi7 (ORCPT ); Mon, 6 Jan 2014 17:38:59 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alex Deucher Subject: [PATCH 3.12 071/144] drm/radeon/dpm: disable ss on Cayman Date: Mon, 6 Jan 2014 14:37:12 -0800 Message-Id: <20140106223747.384032905@linuxfoundation.org> X-Mailer: git-send-email 1.8.5.1.163.gd7aced9 In-Reply-To: <20140106223745.326293132@linuxfoundation.org> References: <20140106223745.326293132@linuxfoundation.org> User-Agent: quilt/0.61-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit c745fe611ca42295c9d91d8e305d27983e9132ef upstream. Spread spectrum seems to cause hangs when dynamic clock switching is enabled. Disable it for now. This does not affect performance or the amount of power saved. Tracked down by Martin Andersson. bug: https://bugs.freedesktop.org/show_bug.cgi?id=69723 Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/rv770_dpm.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/gpu/drm/radeon/rv770_dpm.c +++ b/drivers/gpu/drm/radeon/rv770_dpm.c @@ -2328,6 +2328,12 @@ void rv770_get_engine_memory_ss(struct r pi->mclk_ss = radeon_atombios_get_asic_ss_info(rdev, &ss, ASIC_INTERNAL_MEMORY_SS, 0); + /* disable ss, causes hangs on some cayman boards */ + if (rdev->family == CHIP_CAYMAN) { + pi->sclk_ss = false; + pi->mclk_ss = false; + } + if (pi->sclk_ss || pi->mclk_ss) pi->dynamic_ss = true; else