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drm/amd/powerplay/smu7: disable mclk switching for high refresh rates 

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Cc: stable@vger.kernel.org
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
hifive-unleashed-5.1
Alex Deucher 2017-05-11 13:57:41 -04:00
parent 09be4a5219
commit 2275a3a2fe
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
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@ -2793,7 +2793,8 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
disable_mclk_switching = ((1 < info.display_count) ||
disable_mclk_switching_for_frame_lock ||
smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us));
smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us) ||
(mode_info.refresh_rate > 120));
sclk = smu7_ps->performance_levels[0].engine_clock;
mclk = smu7_ps->performance_levels[0].memory_clock;