[PATCH 11/31] drm/vc4: hvs: Print error if we fail an allocation

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

From: Maxime Ripard <maxime@cerno.tech>

We need to allocate a few additional structures when checking our
atomic_state, especially related to hardware SRAM that will hold the
plane descriptors (DLIST) and the current line context (LBM) during
composition.

Since those allocation can fail, let's add some error message in that
case to help debug what goes wrong.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hvs.c   | 4 +++-
 drivers/gpu/drm/vc4/vc4_plane.c | 7 +++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index 189d00fcf4c2..2c69b74b25a7 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -475,8 +475,10 @@ int vc4_hvs_atomic_check(struct drm_crtc *crtc, struct drm_atomic_state *state)
 	ret = drm_mm_insert_node(&vc4->hvs->dlist_mm, &vc4_state->mm,
 				 dlist_count);
 	spin_unlock_irqrestore(&vc4->hvs->mm_lock, flags);
-	if (ret)
+	if (ret) {
+		drm_err(dev, "Failed to allocate DLIST entry: %d\n", ret);
 		return ret;
+	}
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 978433554f3d..e4fcef11cf6f 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -739,7 +739,8 @@ static void vc4_plane_calc_load(struct drm_plane_state *state)
 
 static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
 {
-	struct vc4_dev *vc4 = to_vc4_dev(state->plane->dev);
+	struct drm_device *drm = state->plane->dev;
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
 	unsigned long irqflags;
 	u32 lbm_size;
@@ -765,8 +766,10 @@ static int vc4_plane_allocate_lbm(struct drm_plane_state *state)
 						 0, 0);
 		spin_unlock_irqrestore(&vc4->hvs->mm_lock, irqflags);
 
-		if (ret)
+		if (ret) {
+			drm_err(drm, "Failed to allocate LBM entry: %d\n", ret);
 			return ret;
+		}
 	} else {
 		WARN_ON_ONCE(lbm_size != vc4_state->lbm.size);
 	}
-- 
2.34.1