drm/amd/display: Enable fast plane updates when state->allow_modeset = true

Submitted by Kazlauskas, Nicholas on June 7, 2019, 3:16 p.m.

Details

Message ID 20190607151655.7991-1-nicholas.kazlauskas@amd.com
State Accepted
Commit 37fb6e8a96fbc9c809c58f9490267ffe7101ac33
Headers show
Series "drm/amd/display: Enable fast plane updates when state->allow_modeset = true" ( rev: 1 ) in AMD X.Org drivers

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Commit Message

Kazlauskas, Nicholas June 7, 2019, 3:16 p.m.
[Why]
Whenever the a modeset is allowed (but not neccessarily required) we
currently recreate all the planes in the state. Most IGT tests and
legacy IOCTLs create atomic commits with this flag set, so the pipes
are often unnecessarily reprogrammed.

Poor performance and stuttering can occur when many of these commits
are frequently issued.

This flag was needed when the appropriate conditions for checking
whether the planes needed a reset were not in place, but
should_reset_plane should cover everything needed now.

[How]
Drop the check for state->allow_modeset in should_reset_plane.

All planes on a CRTC should reset in the following conditions:
- The CRTC needs a modeset
- The CRTC degamma changes
- Planes are added or removed to the CRTC

These conditions are all covered in should_reset_plane.

We still can't drop the format change check in should_reset_plane since
fill_dc_plane_info_and_addr isn't called when validating the state, so
we can't tell if a FULL update is needed or not.

Cc: David Francis <david.francis@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 8 --------
 1 file changed, 8 deletions(-)

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diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index a698c8f272ed..45f0d5b6c468 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6446,14 +6446,6 @@  static bool should_reset_plane(struct drm_atomic_state *state,
 	struct drm_crtc_state *new_crtc_state;
 	int i;
 
-	/*
-	 * TODO: Remove this hack once the checks below are sufficient
-	 * enough to determine when we need to reset all the planes on
-	 * the stream.
-	 */
-	if (state->allow_modeset)
-		return true;
-
 	/* Exit early if we know that we're adding or removing the plane. */
 	if (old_plane_state->crtc != new_plane_state->crtc)
 		return true;