[PATCH] drm/amd/pm: increase mclk switch threshold to 200 us

[Deucher, Alexander]

[AMD Official Use Only - Internal Distribution Only]

Acked-by: Alex Deucher <alexander.deucher at amd.com>
________________________________
From: Quan, Evan <Evan.Quan at amd.com>
Sent: Tuesday, October 13, 2020 2:45 AM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Quan, Evan <Evan.Quan at amd.com>
Subject: [PATCH] drm/amd/pm: increase mclk switch threshold to 200 us

To avoid underflow seen on Polaris10 with some 3440x1440
144Hz displays. As the threshold of 190 us cuts too close
to minVBlankTime of 192 us.

Change-Id: Ieca0dc900f0b5764dc661e397e41e8c277ff13de
Signed-off-by: Evan Quan <evan.quan at amd.com>
---
 drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
index 3bf8be4d107b..1e8919b0acdb 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
@@ -2883,7 +2883,7 @@ static int smu7_vblank_too_short(struct pp_hwmgr *hwmgr,
                 if (hwmgr->is_kicker)
                         switch_limit_us = data->is_memory_gddr5 ? 450 : 150;
                 else
-                       switch_limit_us = data->is_memory_gddr5 ? 190 : 150;
+                       switch_limit_us = data->is_memory_gddr5 ? 200 : 150;
                 break;
         case CHIP_VEGAM:
                 switch_limit_us = 30;
--
2.28.0

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