[PATCH 05/10] drm/amd/display: Force det buf size to 192KB with 3+ streams and upscaling

[Pavle Kotarac]

From: Michael Strauss <michael.stra...@amd.com>

[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.ya...@amd.com>
Acked-by: Pavle Kotarac <pavle.kota...@amd.com>
Signed-off-by: Michael Strauss <michael.stra...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
index 04b52c9d18da..a99800146c9d 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
@@ -1770,6 +1770,7 @@ 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);
 
@@ -1781,6 +1782,11 @@ 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
@@ -1828,6 +1834,8 @@ 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;
-- 
2.32.0