[PATCH 17/21] drm/amd/display: Don't adjust VRR unnecessarily

[Pavle Kotarac]

From: "Cyr, Aric" <Aric.Cyr at amd.com>

[why]
Do not need to spend time reprogramming DRR if there were no updates to
the parameters.

[how]
Compare the current stream state to the requested one to determine if an
update is required.

In amdgpu_dm the timing_changed flag is set but never used so can remove it.
Similarly, the stream update for VRR is done after dc_commit and should
not update its adjust field until after the update is completed.  The
adjust field is managed by dc_stream_adjust_vmin_vmax and should not be
manually updated in amdgpu_dm.

Reviewed-by: Anthony Koo <Anthony.Koo at amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac at amd.com>
Signed-off-by: Aric Cyr <aric.cyr at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 10 ----------
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  1 -
 drivers/gpu/drm/amd/display/dc/core/dc.c          |  3 +++
 3 files changed, 3 insertions(+), 11 deletions(-)

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 dbe76b85552e..7a9f7c7da7d6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7385,11 +7385,6 @@ static void update_freesync_state_on_stream(
 		&vrr_infopacket,
 		pack_sdp_v1_3);
 
-	new_crtc_state->freesync_timing_changed |=
-		(memcmp(&acrtc->dm_irq_params.vrr_params.adjust,
-			&vrr_params.adjust,
-			sizeof(vrr_params.adjust)) != 0);
-
 	new_crtc_state->freesync_vrr_info_changed |=
 		(memcmp(&new_crtc_state->vrr_infopacket,
 			&vrr_infopacket,
@@ -7398,7 +7393,6 @@ static void update_freesync_state_on_stream(
 	acrtc->dm_irq_params.vrr_params = vrr_params;
 	new_crtc_state->vrr_infopacket = vrr_infopacket;
 
-	new_stream->adjust = acrtc->dm_irq_params.vrr_params.adjust;
 	new_stream->vrr_infopacket = vrr_infopacket;
 
 	if (new_crtc_state->freesync_vrr_info_changed)
@@ -7461,10 +7455,6 @@ static void update_stream_irq_parameters(
 				      new_stream,
 				      &config, &vrr_params);
 
-	new_crtc_state->freesync_timing_changed |=
-		(memcmp(&acrtc->dm_irq_params.vrr_params.adjust,
-			&vrr_params.adjust, sizeof(vrr_params.adjust)) != 0);
-
 	new_crtc_state->freesync_config = config;
 	/* Copy state for access from DM IRQ handler */
 	acrtc->dm_irq_params.freesync_config = config;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index b44faaad9b0b..b5ce15c43bcc 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -681,7 +681,6 @@ struct dm_crtc_state {
 
 	int crc_skip_count;
 
-	bool freesync_timing_changed;
 	bool freesync_vrr_info_changed;
 
 	bool dsc_force_changed;
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 9860bf38c547..7481801c6d7c 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -401,6 +401,9 @@ bool dc_stream_adjust_vmin_vmax(struct dc *dc,
 {
 	int i;
 
+	if (memcmp(adjust, &stream->adjust, sizeof(struct dc_crtc_timing_adjust)) == 0)
+		return true;
+
 	stream->adjust.v_total_max = adjust->v_total_max;
 	stream->adjust.v_total_mid = adjust->v_total_mid;
 	stream->adjust.v_total_mid_frame_num = adjust->v_total_mid_frame_num;
-- 
2.34.1