Commit 89cb5614 authored Jul 30, 2019 by Zi Yu Liao Committed by Alex Deucher Aug 23, 2019

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>

parent 57430404

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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,

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