drm/amd/display: Change DCN2 vupdate start programming (7fad39ca) · Commits · 戴 / test

[Why] In order to ensure that incoming flips are latched and complete immediately, we need to program the vupdate interrupt to come during the back porch of each frame. [How] Program the vupdate start_line to be in the back porch like it's done for DCN1. Signed-off-by:

Eryk Brol <eryk.brol@amd.com> Reviewed-by:

Aric Cyr <Aric.Cyr@amd.com> Acked-by:

Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by:

Alex Deucher <alexander.deucher@amd.com>

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

+3 −6

Original line number	Diff line number	Diff line
		@@ -1704,13 +1704,10 @@ void dcn20_unblank_stream(struct pipe_ctx *pipe_ctx,
		void dcn20_setup_vupdate_interrupt(struct pipe_ctx *pipe_ctx)
		{
		struct timing_generator *tg = pipe_ctx->stream_res.tg;
		int start_position = get_vupdate_offset_from_vsync(pipe_ctx);
		uint32_t start_line;
		int start_line = get_vupdate_offset_from_vsync(pipe_ctx);

		if (start_position < 0)
		start_line = pipe_ctx->stream->timing.v_total + start_position - 1;
		else
		start_line = start_position;
		if (start_line < 0)
		start_line = 0;

		if (tg->funcs->setup_vertical_interrupt2)
		tg->funcs->setup_vertical_interrupt2(tg, start_line);

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