drm/radeon/dpm: make sure dc performance level limits are valid (BTC-SI) (v2)
authorAlex Deucher <alexander.deucher@amd.com>
Fri, 30 Aug 2013 20:18:35 +0000 (16:18 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Fri, 30 Aug 2013 20:31:24 +0000 (16:31 -0400)
commit1ff60ddb84bb9ff6fa182710c4e08b66badf918c
tree34a8876fe4c3cebb2915c1a3b36fef9b13014afd
parent5b7d245009e734588e553092f5c0b0bd788b3a55
drm/radeon/dpm: make sure dc performance level limits are valid (BTC-SI) (v2)

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

v2: fix up limits in dpm_init()

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
drivers/gpu/drm/radeon/btc_dpm.c
drivers/gpu/drm/radeon/ni_dpm.c
drivers/gpu/drm/radeon/si_dpm.c