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drm/amd/display: fix MPO HUBP underflow with Scatter Gather 

[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>
This commit is contained in:
Zi Yu Liao 2019-07-30 15:36:53 -04:00 committed by Alex Deucher
parent 574304041b
commit 89cb561473
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@ -934,6 +934,9 @@ 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,