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    Subject[PATCH AUTOSEL 5.3 61/87] drm/amd/display: fix MPO HUBP underflow with Scatter Gather
    Date
    From: Zi Yu Liao <ziyu.liao@amd.com>

    [ Upstream commit 89cb5614736b9b5d3b833ca2237d10da6b4b0395 ]

    [why]
    With Scatter Gather enabled, HUBP underflows during MPO enabled video
    playback. hubp_init has a register write that fixes this problem, but
    the register is cleared when HUBP gets power gated.

    [how]
    Make a call to hubp_init during enable_plane, so that the fix can
    be applied after HUBP powers back on again.

    Signed-off-by: Zi Yu Liao <ziyu.liao@amd.com>
    Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
    Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@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/dcn20/dcn20_hwseq.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
    index f8abe98a576be..8fdb53a44bfb3 100644
    --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
    +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
    @@ -1110,6 +1110,9 @@ void dcn20_enable_plane(
    /* enable DCFCLK current DCHUB */
    pipe_ctx->plane_res.hubp->funcs->hubp_clk_cntl(pipe_ctx->plane_res.hubp, true);

    + /* initialize HUBP on power up */
    + pipe_ctx->plane_res.hubp->funcs->hubp_init(pipe_ctx->plane_res.hubp);
    +
    /* make sure OPP_PIPE_CLOCK_EN = 1 */
    pipe_ctx->stream_res.opp->funcs->opp_pipe_clock_control(
    pipe_ctx->stream_res.opp,
    --
    2.20.1
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