From 51954e17914aaadf18d97b21c2a2cee16fa29513 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 13 Feb 2018 14:26:54 -0500
Subject: [PATCH] drm/amd/powerplay/smu7: allow mclk switching with no displays
Git-commit: 51954e17914aaadf18d97b21c2a2cee16fa29513
Patch-mainline: v4.16-rc4
References: bsc#1051510
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
@@ -2756,10 +2756,13 @@ static int smu7_apply_state_adjust_rules
PHM_PlatformCaps_DisableMclkSwitchingForFrameLock);
- disable_mclk_switching = ((1 < info.display_count) ||
- disable_mclk_switching_for_frame_lock ||
- smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us) ||
- (mode_info.refresh_rate > 120));
+ if (info.display_count == 0)
+ disable_mclk_switching = false;
+ else
+ disable_mclk_switching = ((1 < info.display_count) ||
+ disable_mclk_switching_for_frame_lock ||
+ 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;