drm/radeon/dpm: disable ss on Cayman
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> Cc: stable@vger.kernel.org
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@ -2328,6 +2328,12 @@ void rv770_get_engine_memory_ss(struct radeon_device *rdev)
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pi->mclk_ss = radeon_atombios_get_asic_ss_info(rdev, &ss,
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ASIC_INTERNAL_MEMORY_SS, 0);
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/* disable ss, causes hangs on some cayman boards */
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if (rdev->family == CHIP_CAYMAN) {
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pi->sclk_ss = false;
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pi->mclk_ss = false;
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}
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if (pi->sclk_ss || pi->mclk_ss)
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pi->dynamic_ss = true;
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else
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