drm/amd/display: Call into DC once per multiplane flip

[Why]
amdgpu_dm_commit_planes was performing multi-plane
flips incorrectly:

It waited for vblank once per flipped plane

It prepared flip ISR and acquired the corresponding vblank ref
once per plane, although it closed ISR and put the ref once
per crtc

It called into dc once per flipped plane, duplicating some work

[How]
Wait for vblank, get vblank ref, prepare flip ISR, and call into
DC only once, and only if there is a pageflip

Make freesync continue to update planes even if vrr information
has already been changed
Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -4589,12 +4589,12 @@ static void update_freesync_state_on_stream(
 		TRANSFER_FUNC_UNKNOWN,
 		&vrr_infopacket);
 
-	new_crtc_state->freesync_timing_changed =
+	new_crtc_state->freesync_timing_changed |=
 		(memcmp(&new_crtc_state->vrr_params.adjust,
 			&vrr_params.adjust,
 			sizeof(vrr_params.adjust)) != 0);
 
-	new_crtc_state->freesync_vrr_info_changed =
+	new_crtc_state->freesync_vrr_info_changed |=
 		(memcmp(&new_crtc_state->vrr_infopacket,
 			&vrr_infopacket,
 			sizeof(vrr_infopacket)) != 0);
@@ -4618,156 +4618,6 @@ static void update_freesync_state_on_stream(
 				  vrr_params.adjust.v_total_max);
 }
 
-/*
- * Executes flip
- *
- * Waits on all BO's fences and for proper vblank count
- */
-static void amdgpu_dm_do_flip(struct drm_crtc *crtc,
-			      struct drm_framebuffer *fb,
-			      uint32_t target,
-			      struct dc_state *state)
-{
-	unsigned long flags;
-	uint64_t timestamp_ns;
-	uint32_t target_vblank;
-	int r, vpos, hpos;
-	struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);
-	struct amdgpu_framebuffer *afb = to_amdgpu_framebuffer(fb);
-	struct amdgpu_bo *abo = gem_to_amdgpu_bo(fb->obj[0]);
-	struct amdgpu_device *adev = crtc->dev->dev_private;
-	bool async_flip = (crtc->state->pageflip_flags & DRM_MODE_PAGE_FLIP_ASYNC) != 0;
-	struct dc_flip_addrs addr = { {0} };
-	/* TODO eliminate or rename surface_update */
-	struct dc_surface_update surface_updates[1] = { {0} };
-	struct dc_stream_update stream_update = {0};
-	struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state);
-	struct dc_stream_status *stream_status;
-	struct dc_plane_state *surface;
-	uint64_t tiling_flags, dcc_address;
-
-
-	/* Prepare wait for target vblank early - before the fence-waits */
-	target_vblank = target - (uint32_t)drm_crtc_vblank_count(crtc) +
-			amdgpu_get_vblank_counter_kms(crtc->dev, acrtc->crtc_id);
-
-	/*
-	 * TODO This might fail and hence better not used, wait
-	 * explicitly on fences instead
-	 * and in general should be called for
-	 * blocking commit to as per framework helpers
-	 */
-	r = amdgpu_bo_reserve(abo, true);
-	if (unlikely(r != 0)) {
-		DRM_ERROR("failed to reserve buffer before flip\n");
-		WARN_ON(1);
-	}
-
-	/* Wait for all fences on this FB */
-	WARN_ON(reservation_object_wait_timeout_rcu(abo->tbo.resv, true, false,
-								    MAX_SCHEDULE_TIMEOUT) < 0);
-
-	amdgpu_bo_get_tiling_flags(abo, &tiling_flags);
-
-	amdgpu_bo_unreserve(abo);
-
-	/*
-	 * Wait until we're out of the vertical blank period before the one
-	 * targeted by the flip
-	 */
-	while ((acrtc->enabled &&
-		(amdgpu_display_get_crtc_scanoutpos(adev->ddev, acrtc->crtc_id,
-						    0, &vpos, &hpos, NULL,
-						    NULL, &crtc->hwmode)
-		 & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK)) ==
-		(DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK) &&
-		(int)(target_vblank -
-		  amdgpu_get_vblank_counter_kms(adev->ddev, acrtc->crtc_id)) > 0)) {
-		usleep_range(1000, 1100);
-	}
-
-	/* Flip */
-	spin_lock_irqsave(&crtc->dev->event_lock, flags);
-
-	WARN_ON(acrtc->pflip_status != AMDGPU_FLIP_NONE);
-	WARN_ON(!acrtc_state->stream);
-
-	addr.address.grph.addr.low_part = lower_32_bits(afb->address);
-	addr.address.grph.addr.high_part = upper_32_bits(afb->address);
-
-	dcc_address = get_dcc_address(afb->address, tiling_flags);
-	addr.address.grph.meta_addr.low_part = lower_32_bits(dcc_address);
-	addr.address.grph.meta_addr.high_part = upper_32_bits(dcc_address);
-
-	addr.flip_immediate = async_flip;
-
-	timestamp_ns = ktime_get_ns();
-	addr.flip_timestamp_in_us = div_u64(timestamp_ns, 1000);
-
-
-	if (acrtc->base.state->event)
-		prepare_flip_isr(acrtc);
-
-	spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
-
-	stream_status = dc_stream_get_status(acrtc_state->stream);
-	if (!stream_status) {
-		DRM_ERROR("No stream status for CRTC: id=%d\n",
-			acrtc->crtc_id);
-		return;
-	}
-
-	surface = stream_status->plane_states[0];
-	surface_updates->surface = surface;
-
-	if (!surface) {
-		DRM_ERROR("No surface for CRTC: id=%d\n",
-			acrtc->crtc_id);
-		return;
-	}
-	surface_updates->flip_addr = &addr;
-
-	if (acrtc_state->stream) {
-		update_freesync_state_on_stream(
-			&adev->dm,
-			acrtc_state,
-			acrtc_state->stream,
-			surface,
-			addr.flip_timestamp_in_us);
-
-		if (acrtc_state->freesync_timing_changed)
-			stream_update.adjust =
-				&acrtc_state->stream->adjust;
-
-		if (acrtc_state->freesync_vrr_info_changed)
-			stream_update.vrr_infopacket =
-				&acrtc_state->stream->vrr_infopacket;
-	}
-
-	/* Update surface timing information. */
-	surface->time.time_elapsed_in_us[surface->time.index] =
-		addr.flip_timestamp_in_us - surface->time.prev_update_time_in_us;
-	surface->time.prev_update_time_in_us = addr.flip_timestamp_in_us;
-	surface->time.index++;
-	if (surface->time.index >= DC_PLANE_UPDATE_TIMES_MAX)
-		surface->time.index = 0;
-
-	mutex_lock(&adev->dm.dc_lock);
-
-	dc_commit_updates_for_stream(adev->dm.dc,
-					     surface_updates,
-					     1,
-					     acrtc_state->stream,
-					     &stream_update,
-					     state);
-	mutex_unlock(&adev->dm.dc_lock);
-
-	DRM_DEBUG_DRIVER("%s Flipping to hi: 0x%x, low: 0x%x \n",
-			 __func__,
-			 addr.address.grph.addr.high_part,
-			 addr.address.grph.addr.low_part);
-}
-
 /*
  * TODO this whole function needs to go
  *
@@ -4874,10 +4724,10 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 				    struct drm_crtc *pcrtc,
 				    bool *wait_for_vblank)
 {
-	uint32_t i;
+	uint32_t i, r;
+	uint64_t timestamp_ns;
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
-	struct dc_stream_state *dc_stream_attach;
 	struct dc_plane_state *plane_states_constructed[MAX_SURFACES];
 	struct amdgpu_crtc *acrtc_attach = to_amdgpu_crtc(pcrtc);
 	struct drm_crtc_state *new_pcrtc_state =
@@ -4885,17 +4735,35 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 	struct dm_crtc_state *acrtc_state = to_dm_crtc_state(new_pcrtc_state);
 	struct dm_crtc_state *dm_old_crtc_state =
 			to_dm_crtc_state(drm_atomic_get_old_crtc_state(state, pcrtc));
-	int planes_count = 0;
+	int flip_count = 0, planes_count = 0, vpos, hpos;
 	unsigned long flags;
+	struct amdgpu_bo *abo;
+	uint64_t tiling_flags, dcc_address;
+	struct dc_stream_status *stream_status;
+	uint32_t target, target_vblank;
+
+	struct {
+		struct dc_surface_update surface_updates[MAX_SURFACES];
+		struct dc_flip_addrs flip_addrs[MAX_SURFACES];
+		struct dc_stream_update stream_update;
+	} *flip;
+
+	flip = kzalloc(sizeof(*flip), GFP_KERNEL);
+
+	if (!flip)
+		dm_error("Failed to allocate update bundles\n");
 
 	/* update planes when needed */
 	for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 		struct drm_crtc *crtc = new_plane_state->crtc;
 		struct drm_crtc_state *new_crtc_state;
 		struct drm_framebuffer *fb = new_plane_state->fb;
+		struct amdgpu_framebuffer *afb = to_amdgpu_framebuffer(fb);
 		bool pflip_needed;
+		struct dc_plane_state *surface;
 		struct dm_plane_state *dm_new_plane_state = to_dm_plane_state(new_plane_state);
 
+
 		if (plane->type == DRM_PLANE_TYPE_CURSOR) {
 			handle_cursor_update(plane, old_plane_state);
 			continue;
@@ -4910,44 +4778,150 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 
 		pflip_needed = !state->allow_modeset;
 
-		spin_lock_irqsave(&crtc->dev->event_lock, flags);
-		if (acrtc_attach->pflip_status != AMDGPU_FLIP_NONE) {
-			DRM_ERROR("%s: acrtc %d, already busy\n",
-				  __func__,
-				  acrtc_attach->crtc_id);
-			/* In commit tail framework this cannot happen */
-			WARN_ON(1);
-		}
-		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
-
 		if (!pflip_needed || plane->type == DRM_PLANE_TYPE_OVERLAY) {
 			WARN_ON(!dm_new_plane_state->dc_state);
 
 			plane_states_constructed[planes_count] = dm_new_plane_state->dc_state;
 
-			dc_stream_attach = acrtc_state->stream;
 			planes_count++;
 
 		} else if (new_crtc_state->planes_changed) {
-			/* Assume even ONE crtc with immediate flip means
+			/*
+			 * Assume even ONE crtc with immediate flip means
 			 * entire can't wait for VBLANK
 			 * TODO Check if it's correct
 			 */
-			*wait_for_vblank =
-					new_pcrtc_state->pageflip_flags & DRM_MODE_PAGE_FLIP_ASYNC ?
-				false : true;
-
-			/* TODO: Needs rework for multiplane flip */
-			if (plane->type == DRM_PLANE_TYPE_PRIMARY)
-				drm_crtc_vblank_get(crtc);
-
-			amdgpu_dm_do_flip(
-				crtc,
-				fb,
-				(uint32_t)drm_crtc_vblank_count(crtc) + *wait_for_vblank,
-				dc_state);
+			if (new_pcrtc_state->pageflip_flags & DRM_MODE_PAGE_FLIP_ASYNC)
+				*wait_for_vblank = false;
+
+			/*
+			 * TODO This might fail and hence better not used, wait
+			 * explicitly on fences instead
+			 * and in general should be called for
+			 * blocking commit to as per framework helpers
+			 */
+			abo = gem_to_amdgpu_bo(fb->obj[0]);
+			r = amdgpu_bo_reserve(abo, true);
+			if (unlikely(r != 0)) {
+				DRM_ERROR("failed to reserve buffer before flip\n");
+				WARN_ON(1);
 			}
 
+			/* Wait for all fences on this FB */
+			WARN_ON(reservation_object_wait_timeout_rcu(abo->tbo.resv, true, false,
+										    MAX_SCHEDULE_TIMEOUT) < 0);
+
+			amdgpu_bo_get_tiling_flags(abo, &tiling_flags);
+
+			amdgpu_bo_unreserve(abo);
+
+			flip->flip_addrs[flip_count].address.grph.addr.low_part = lower_32_bits(afb->address);
+			flip->flip_addrs[flip_count].address.grph.addr.high_part = upper_32_bits(afb->address);
+
+			dcc_address = get_dcc_address(afb->address, tiling_flags);
+			flip->flip_addrs[flip_count].address.grph.meta_addr.low_part = lower_32_bits(dcc_address);
+			flip->flip_addrs[flip_count].address.grph.meta_addr.high_part = upper_32_bits(dcc_address);
+
+			flip->flip_addrs[flip_count].flip_immediate =
+					(crtc->state->pageflip_flags & DRM_MODE_PAGE_FLIP_ASYNC) != 0;
+
+			timestamp_ns = ktime_get_ns();
+			flip->flip_addrs[flip_count].flip_timestamp_in_us = div_u64(timestamp_ns, 1000);
+			flip->surface_updates[flip_count].flip_addr = &flip->flip_addrs[flip_count];
+
+			stream_status = dc_stream_get_status(acrtc_state->stream);
+			if (!stream_status) {
+				DRM_ERROR("No stream status for CRTC: id=%d\n",
+						acrtc_attach->crtc_id);
+				continue;
+			}
+
+			surface = stream_status->plane_states[0];
+			flip->surface_updates[flip_count].surface = surface;
+			if (!flip->surface_updates[flip_count].surface) {
+				DRM_ERROR("No surface for CRTC: id=%d\n",
+						acrtc_attach->crtc_id);
+				continue;
+			}
+
+			if (acrtc_state->stream)
+				update_freesync_state_on_stream(
+					dm,
+					acrtc_state,
+					acrtc_state->stream,
+					surface,
+					flip->flip_addrs[flip_count].flip_timestamp_in_us);
+
+			/* Update surface timing information. */
+			surface->time.time_elapsed_in_us[surface->time.index] =
+				flip->flip_addrs[flip_count].flip_timestamp_in_us -
+				surface->time.prev_update_time_in_us;
+			surface->time.prev_update_time_in_us = flip->flip_addrs[flip_count].flip_timestamp_in_us;
+			surface->time.index++;
+			if (surface->time.index >= DC_PLANE_UPDATE_TIMES_MAX)
+				surface->time.index = 0;
+
+			DRM_DEBUG_DRIVER("%s Flipping to hi: 0x%x, low: 0x%x\n",
+					 __func__,
+					 flip->flip_addrs[flip_count].address.grph.addr.high_part,
+					 flip->flip_addrs[flip_count].address.grph.addr.low_part);
+
+			flip_count += 1;
+		}
+
+	}
+
+	if (flip_count) {
+		target = (uint32_t)drm_crtc_vblank_count(pcrtc) + *wait_for_vblank;
+		/* Prepare wait for target vblank early - before the fence-waits */
+		target_vblank = target - (uint32_t)drm_crtc_vblank_count(pcrtc) +
+				amdgpu_get_vblank_counter_kms(pcrtc->dev, acrtc_attach->crtc_id);
+
+		/*
+		 * Wait until we're out of the vertical blank period before the one
+		 * targeted by the flip
+		 */
+		while ((acrtc_attach->enabled &&
+			(amdgpu_display_get_crtc_scanoutpos(dm->ddev, acrtc_attach->crtc_id,
+							    0, &vpos, &hpos, NULL,
+							    NULL, &pcrtc->hwmode)
+			 & (DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK)) ==
+			(DRM_SCANOUTPOS_VALID | DRM_SCANOUTPOS_IN_VBLANK) &&
+			(int)(target_vblank -
+			  amdgpu_get_vblank_counter_kms(dm->ddev, acrtc_attach->crtc_id)) > 0)) {
+			usleep_range(1000, 1100);
+		}
+
+		if (acrtc_attach->base.state->event) {
+			drm_crtc_vblank_get(pcrtc);
+
+			spin_lock_irqsave(&pcrtc->dev->event_lock, flags);
+
+			WARN_ON(acrtc_attach->pflip_status != AMDGPU_FLIP_NONE);
+			prepare_flip_isr(acrtc_attach);
+
+			spin_unlock_irqrestore(&pcrtc->dev->event_lock, flags);
+		}
+
+		if (acrtc_state->stream) {
+
+			if (acrtc_state->freesync_timing_changed)
+				flip->stream_update.adjust =
+					&acrtc_state->stream->adjust;
+
+			if (acrtc_state->freesync_vrr_info_changed)
+				flip->stream_update.vrr_infopacket =
+					&acrtc_state->stream->vrr_infopacket;
+		}
+
+		mutex_lock(&dm->dc_lock);
+		dc_commit_updates_for_stream(dm->dc,
+						     flip->surface_updates,
+						     flip_count,
+						     acrtc_state->stream,
+						     &flip->stream_update,
+						     dc_state);
+		mutex_unlock(&dm->dc_lock);
 	}
 
 	if (planes_count) {
@@ -4962,7 +4936,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 			spin_unlock_irqrestore(&pcrtc->dev->event_lock, flags);
 		}
 
-		dc_stream_attach->abm_level = acrtc_state->abm_level;
+		acrtc_state->stream->abm_level = acrtc_state->abm_level;
 
 		if (false == commit_planes_to_stream(dm,
 							dm->dc,