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


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