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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
This commit is contained in:
Alex Deucher 2013-12-09 17:46:59 -05:00
parent 533518a43a
commit c745fe611c
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/rv770_dpm.c
View File

@ -2328,6 +2328,12 @@ void rv770_get_engine_memory_ss(struct radeon_device *rdev)
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