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drm/amd/display: Fix surface optimization regression on Carrizo

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[Why]
DCE legacy optimization path isn't well tested under new DC optimization
flow which can result in underflow occuring when initializing X11 on
Carrizo.

[How]
Retain the legacy optimization flow for DCE and keep the new one for DCN
to satisfy optimizations being correctly applied for ASIC that can
support it.

Fixes: 34316c1e56 ("drm/amd/display: Optimize bandwidth on following fast update")
Reported-by: Tom St Denis <tom.stdenis@amd.com>
Tested-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2021-10-12 10:04:03 -04:00 committed by Alex Deucher
parent 9470620e99
commit 62e5a7e233
1 changed files with 13 additions and 2 deletions
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15
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -3118,8 +3118,13 @@ void dc_commit_updates_for_stream(struct dc *dc,
if (new_pipe->plane_state && new_pipe->plane_state != old_pipe->plane_state)
new_pipe->plane_state->force_full_update = true;
}
} else if (update_type == UPDATE_TYPE_FAST) {
/* Previous frame finished and HW is ready for optimization. */
} else if (update_type == UPDATE_TYPE_FAST && dc_ctx->dce_version >= DCE_VERSION_MAX) {
/*
* Previous frame finished and HW is ready for optimization.
*
* Only relevant for DCN behavior where we can guarantee the optimization
* is safe to apply - retain the legacy behavior for DCE.
*/
dc_post_update_surfaces_to_stream(dc);
}
@ -3178,6 +3183,12 @@ void dc_commit_updates_for_stream(struct dc *dc,
}
}
/* Legacy optimization path for DCE. */
if (update_type >= UPDATE_TYPE_FULL && dc_ctx->dce_version < DCE_VERSION_MAX) {
dc_post_update_surfaces_to_stream(dc);
TRACE_DCE_CLOCK_STATE(&context->bw_ctx.bw.dce);
}
return;
}