From eef10dc32594c6bb00b0c6af4a0f4ce197ddc623 Mon Sep 17 00:00:00 2001
From: Denes Tarjan <denes.tarjan@arm.com>
Date: Mon, 23 Sep 2024 14:34:15 +0000
Subject: [PATCH] Disable morphology HAL for small kernels

---
 adapters/opencv/kleidicv_hal.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/adapters/opencv/kleidicv_hal.cpp b/adapters/opencv/kleidicv_hal.cpp
index a9f106e47..0d0bcb5cb 100644
--- a/adapters/opencv/kleidicv_hal.cpp
+++ b/adapters/opencv/kleidicv_hal.cpp
@@ -630,6 +630,13 @@ int morphology_init(cvhalFilter2D **cvcontext, int operation, int src_type,
   size_t kernel_height_sz = static_cast<size_t>(kernel_height);
   size_t kernel_area = kernel_width_sz * kernel_height_sz;
 
+#if !KLEIDICV_ENABLE_ALL_OPENCV_HAL
+  // KleidiCV is not that fast on smaller kernels
+  if (kernel_width_sz < 5 || kernel_height < 5) {
+    return CV_HAL_ERROR_NOT_IMPLEMENTED;
+  }
+#endif
+
   switch (CV_MAT_DEPTH(kernel_type)) {
     case CV_8U: {
       size_t nonzero_count = 0;
-- 
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