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Subject[PATCH 4.15 027/146] drm/amd/powerplay/vega10: allow mclk switching with no displays
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@amd.com>

commit 5825acf5c958a6820b04e9811caeb2f5e572bcd8 upstream.

If there are no displays attached, there is no reason to disable
mclk switching.

Fixes mclks getting set to high when there are no displays attached.

Reviewed-by: Eric Huang <JinhuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
@@ -3208,10 +3208,13 @@ static int vega10_apply_state_adjust_rul
disable_mclk_switching_for_vr = PP_CAP(PHM_PlatformCaps_DisableMclkSwitchForVR);
force_mclk_high = PP_CAP(PHM_PlatformCaps_ForceMclkHigh);

- disable_mclk_switching = (info.display_count > 1) ||
- disable_mclk_switching_for_frame_lock ||
- disable_mclk_switching_for_vr ||
- force_mclk_high;
+ if (info.display_count == 0)
+ disable_mclk_switching = false;
+ else
+ disable_mclk_switching = (info.display_count > 1) ||
+ disable_mclk_switching_for_frame_lock ||
+ disable_mclk_switching_for_vr ||
+ force_mclk_high;

sclk = vega10_ps->performance_levels[0].gfx_clock;
mclk = vega10_ps->performance_levels[0].mem_clock;

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