[PATCH 4.19 141/211] drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2)

From: Greg Kroah-Hartman
Date: Thu Oct 03 2019 - 12:21:02 EST


From: Ahzo <Ahzo@xxxxxxxxxxxx>

[ Upstream commit f659bb6dae58c113805f92822e4c16ddd3156b79 ]

This fixes screen corruption/flickering on 75 Hz displays.

v2: make print statement debug only (Alex)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102646
Reviewed-by: Evan Quan <evan.quan@xxxxxxx>
Signed-off-by: Ahzo <Ahzo@xxxxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
index b52ccab428a9e..c7c505095402d 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
@@ -4052,6 +4052,11 @@ static int smu7_program_display_gap(struct pp_hwmgr *hwmgr)

data->frame_time_x2 = frame_time_in_us * 2 / 100;

+ if (data->frame_time_x2 < 280) {
+ pr_debug("%s: enforce minimal VBITimeout: %d -> 280\n", __func__, data->frame_time_x2);
+ data->frame_time_x2 = 280;
+ }
+
display_gap2 = pre_vbi_time_in_us * (ref_clock / 100);

cgs_write_ind_register(hwmgr->device, CGS_IND_REG__SMC, ixCG_DISPLAY_GAP_CNTL2, display_gap2);
--
2.20.1