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drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2)

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[ 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@amd.com>
Signed-off-by: Ahzo <Ahzo@tutanota.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ahzo 2019-08-05 21:14:18 +02:00 committed by Greg Kroah-Hartman
parent 9a6bb360f5
commit 33bdbb12e2
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c
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@ -3739,6 +3739,11 @@ 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);