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drm/radeon/dpm: make sure dc performance level limits are valid (CI)

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Check to make sure the dc limits are valid before using them.
Some systems may not have a dc limits table.  In that case just
use the ac limits.  This fixes hangs on systems when the power
state is changed when on battery (dc) due to invalid performance
state parameters.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=68708

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-08-30 16:24:33 -04:00
parent 1ff60ddb84
commit 679fe80fbe
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/ci_dpm.c
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@ -5179,6 +5179,12 @@ int ci_dpm_init(struct radeon_device *rdev)
pi->uvd_power_gated = false;
/* make sure dc limits are valid */
if ((rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.sclk == 0) ||
(rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.mclk == 0))
rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc =
rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
return 0;
}