linux-kernel - [PATCH 5.9 357/391] drm/amd/pm: increase mclk switch threshold to 200 us

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Date:   Tue,  3 Nov 2020 21:36:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.9 357/391] drm/amd/pm: increase mclk switch threshold to 200 us

From: Evan Quan <evan.quan@....com>

commit 83da6eea3af669ee0b1f1bc05ffd6150af984994 upstream.

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.

Signed-off-by: Evan Quan <evan.quan@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


---
 drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
@@ -2873,7 +2873,7 @@ static int smu7_vblank_too_short(struct
 		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;