From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alex Deucher Subject: [PATCH 3.13 058/120] drm/radeon/dpm: disable mclk switching on desktop RV770 Date: Tue, 11 Feb 2014 11:04:59 -0800 Message-Id: <20140211184825.278466197@linuxfoundation.org> In-Reply-To: <20140211184823.492407127@linuxfoundation.org> References: <20140211184823.492407127@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit 8097d94116d0c17e774ba4c8256e774018dc2a46 upstream. Mclk switching doesn't seem to work reliably on these cards. Most RV770 boards specify the same mclk for all performance levels anyway so in most cases, this has no affect. Bug: https://bugs.freedesktop.org/show_bug.cgi?id=73067 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 @@ -2531,6 +2531,12 @@ bool rv770_dpm_vblank_too_short(struct r (rdev->pdev->subsystem_device == 0x1c42)) switch_limit = 200; + /* RV770 */ + /* mclk switching doesn't seem to work reliably on desktop RV770s */ + if ((rdev->family == CHIP_RV770) && + !(rdev->flags & RADEON_IS_MOBILITY)) + switch_limit = 0xffffffff; /* disable mclk switching */ + if (vblank_time < switch_limit) return true; else