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drm/amd/display: Change DCN2 vupdate start programming 

[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>
This commit is contained in:
Eryk Brol 2019-04-15 16:09:01 -04:00 committed by Alex Deucher
parent 78b674573a
commit 7fad39ca4a
1 changed files with 3 additions and 6 deletions
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9
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@ -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);