Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 071/144] drm/radeon/dpm: disable ss on Cayman | Date | Mon, 6 Jan 2014 14:37:12 -0800 |
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3.12-stable review patch. If anyone has any objections, please let me know.
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From: Alex Deucher <alexander.deucher@amd.com>
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 <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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
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