| From b38096bab1f264e185cb3b81ed3582f237cc3f37 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 5 Aug 2019 21:14:18 +0200 |
| Subject: drm/amd/powerplay/smu7: enforce minimal VBITimeout (v2) |
| |
| From: Ahzo <Ahzo@tutanota.com> |
| |
| [ 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> |
| --- |
| 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 3907439417e76..c0db3b57dfe58 100644 |
| --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c |
| +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c |
| @@ -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); |
| -- |
| 2.20.1 |
| |