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drm/amd/display: Force det buf size to 192KB with 3+ streams and upscaling 

[WHY]
This workaround resolves underflow caused by incorrect DST_Y_PREFETCH.
Overriding to 192KB DET buf size until the DST_Y_PREFETCH calc is fixed.

Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michael Strauss 2021-12-10 15:04:03 -08:00 committed by Alex Deucher
parent cd9a0d026b
commit 4658b25d38
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
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@ -1776,6 +1776,7 @@ static int dcn31_populate_dml_pipes_from_context(
int i, pipe_cnt;
struct resource_context *res_ctx = &context->res_ctx;
struct pipe_ctx *pipe;
bool upscaled = false;
dcn20_populate_dml_pipes_from_context(dc, context, pipes, fast_validate);
@ -1787,6 +1788,11 @@ static int dcn31_populate_dml_pipes_from_context(
pipe = &res_ctx->pipe_ctx[i];
timing = &pipe->stream->timing;
if (pipe->plane_state &&
(pipe->plane_state->src_rect.height < pipe->plane_state->dst_rect.height ||
pipe->plane_state->src_rect.width < pipe->plane_state->dst_rect.width))
upscaled = true;
/*
* Immediate flip can be set dynamically after enabling the plane.
* We need to require support for immediate flip or underflow can be
@ -1834,6 +1840,8 @@ static int dcn31_populate_dml_pipes_from_context(
} else if (context->stream_count >= dc->debug.crb_alloc_policy_min_disp_count
&& dc->debug.crb_alloc_policy > DET_SIZE_DEFAULT) {
context->bw_ctx.dml.ip.det_buffer_size_kbytes = dc->debug.crb_alloc_policy * 64;
} else if (context->stream_count >= 3 && upscaled) {
context->bw_ctx.dml.ip.det_buffer_size_kbytes = 192;
}
return pipe_cnt;