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    Subject[PATCH 5.0 300/346] drm/amd/display: add pipe lock during stream update
    Date
    [ Upstream commit e6bddf6c67f9a3abf6f1ef75e52bc1cd228dfe4d ]

    [why]
    Stream update will adjust both info packets and stream params,
    need to make sure all things are applied togather.

    [how]
    add pipe lock during stream update

    Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
    Reviewed-by: Jun Lei <Jun.Lei@amd.com>
    Acked-by: Leo Li <sunpeng.li@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/display/dc/core/dc.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
    index 68529acba015f..c0db7788c4641 100644
    --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
    +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
    @@ -1511,6 +1511,7 @@ static void commit_planes_do_stream_update(struct dc *dc,
    continue;

    if (stream_update->dpms_off) {
    + dc->hwss.pipe_control_lock(dc, pipe_ctx, true);
    if (*stream_update->dpms_off) {
    core_link_disable_stream(pipe_ctx, KEEP_ACQUIRED_RESOURCE);
    dc->hwss.optimize_bandwidth(dc, dc->current_state);
    @@ -1518,6 +1519,7 @@ static void commit_planes_do_stream_update(struct dc *dc,
    dc->hwss.prepare_bandwidth(dc, dc->current_state);
    core_link_enable_stream(dc->current_state, pipe_ctx);
    }
    + dc->hwss.pipe_control_lock(dc, pipe_ctx, false);
    }

    if (stream_update->abm_level && pipe_ctx->stream_res.abm) {
    --
    2.20.1


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