[PATCH 2/4] drm/amdgpu: switch DM to atomic fence helpers

[Christian König]

This gives us the standard atomic implicit and explicit fencing rules.

Signed-off-by: Christian König <christian.koenig at amd.com>
Cc: Harry Wentland <harry.wentland at amd.com>
Cc: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Cc: Roman Li <Roman.Li at amd.com>
Cc: Qingqing Zhuo <qingqing.zhuo at amd.com>
Cc: Jude Shih <shenshih at amd.com>
Cc: Wayne Lin <Wayne.Lin at amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira at amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 23 ++++++++-----------
 1 file changed, 10 insertions(+), 13 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 2ade82cfb1ac..c5b2417adcc6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -83,6 +83,7 @@
 #include <drm/drm_edid.h>
 #include <drm/drm_vblank.h>
 #include <drm/drm_audio_component.h>
+#include <drm/drm_gem_atomic_helper.h>
 
 #if defined(CONFIG_DRM_AMD_DC_DCN)
 #include "ivsrcid/dcn/irqsrcs_dcn_1_0.h"
@@ -7627,6 +7628,10 @@ static int dm_plane_helper_prepare_fb(struct drm_plane *plane,
 		goto error_unpin;
 	}
 
+	r = drm_gem_plane_helper_prepare_fb(plane, new_state);
+	if (unlikely(r != 0))
+		goto error_unpin;
+
 	amdgpu_bo_unreserve(rbo);
 
 	afb->address = amdgpu_bo_gpu_offset(rbo);
@@ -9160,7 +9165,6 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *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, vpos, hpos;
-	long r;
 	unsigned long flags;
 	struct amdgpu_bo *abo;
 	uint32_t target_vblank, last_flip_vblank;
@@ -9173,6 +9177,7 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		struct dc_flip_addrs flip_addrs[MAX_SURFACES];
 		struct dc_stream_update stream_update;
 	} *bundle;
+	int r;
 
 	bundle = kzalloc(sizeof(*bundle), GFP_KERNEL);
 
@@ -9181,6 +9186,10 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		goto cleanup;
 	}
 
+	r = drm_atomic_helper_wait_for_fences(dev, state, false);
+	if (unlikely(r))
+		DRM_ERROR("Waiting for fences timed out!");
+
 	/*
 	 * Disable the cursor first if we're disabling all the planes.
 	 * It'll remain on the screen after the planes are re-enabled
@@ -9235,18 +9244,6 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		}
 
 		abo = gem_to_amdgpu_bo(fb->obj[0]);
-
-		/*
-		 * Wait for all fences on this FB. Do limited wait to avoid
-		 * deadlock during GPU reset when this fence will not signal
-		 * but we hold reservation lock for the BO.
-		 */
-		r = dma_resv_wait_timeout(abo->tbo.base.resv,
-					  DMA_RESV_USAGE_WRITE, false,
-					  msecs_to_jiffies(5000));
-		if (unlikely(r <= 0))
-			DRM_ERROR("Waiting for fences timed out!");
-
 		fill_dc_plane_info_and_addr(
 			dm->adev, new_plane_state,
 			afb->tiling_flags,
-- 
2.25.1