diff --git a/src/asahi/vulkan/hk_cmd_buffer.c b/src/asahi/vulkan/hk_cmd_buffer.c
index ff4d69cb7e3..874ff46ffd6 100644
--- a/src/asahi/vulkan/hk_cmd_buffer.c
+++ b/src/asahi/vulkan/hk_cmd_buffer.c
@@ -695,8 +695,11 @@ hk_upload_usc_words(struct hk_cmd_buffer *cmd, struct hk_shader *s,
          hk_usc_upload_spilled_rt_descs(&b, cmd);
       }
 
-      agx_usc_uniform(
-         &b, 4, 8, root_ptr + hk_root_descriptor_offset(draw.blend_constant));
+      if (cmd->state.gfx.uses_blend_constant) {
+         agx_usc_uniform(
+            &b, 4, 8,
+            root_ptr + hk_root_descriptor_offset(draw.blend_constant));
+      }
 
       /* The SHARED state is baked into linked->usc for non-fragment shaders. We
        * don't pass around the information to bake the tilebuffer layout.
diff --git a/src/asahi/vulkan/hk_cmd_buffer.h b/src/asahi/vulkan/hk_cmd_buffer.h
index 1a491742e83..2a69a1c12af 100644
--- a/src/asahi/vulkan/hk_cmd_buffer.h
+++ b/src/asahi/vulkan/hk_cmd_buffer.h
@@ -268,6 +268,9 @@ struct hk_graphics_state {
    struct hk_linked_shader *linked[PIPE_SHADER_TYPES];
    bool generate_primitive_id;
 
+   /* Whether blend constants are required by the active blend state */
+   bool uses_blend_constant;
+
    /* Tessellation state */
    struct {
       uint64_t out_draws;
diff --git a/src/asahi/vulkan/hk_cmd_draw.c b/src/asahi/vulkan/hk_cmd_draw.c
index f5e747c5a82..92528535590 100644
--- a/src/asahi/vulkan/hk_cmd_draw.c
+++ b/src/asahi/vulkan/hk_cmd_draw.c
@@ -2534,6 +2534,36 @@ hk_depth_bias_factor(VkFormat format, bool exact, bool force_unorm)
    }
 }
 
+static bool
+uses_blend_constant(const struct vk_color_blend_state *cb)
+{
+   static_assert(VK_BLEND_FACTOR_CONSTANT_COLOR + 1 ==
+                 VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_COLOR);
+
+   static_assert(VK_BLEND_FACTOR_CONSTANT_COLOR + 2 ==
+                 VK_BLEND_FACTOR_CONSTANT_ALPHA);
+
+   static_assert(VK_BLEND_FACTOR_CONSTANT_COLOR + 3 ==
+                 VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_ALPHA);
+
+   for (unsigned i = 0; i < cb->attachment_count; ++i) {
+      unsigned factors[] = {
+         cb->attachments[i].src_color_blend_factor,
+         cb->attachments[i].src_alpha_blend_factor,
+         cb->attachments[i].dst_color_blend_factor,
+         cb->attachments[i].dst_alpha_blend_factor,
+      };
+
+      for (unsigned j = 0; j < ARRAY_SIZE(factors); ++j) {
+         if (factors[j] >= VK_BLEND_FACTOR_CONSTANT_COLOR &&
+             factors[j] <= VK_BLEND_FACTOR_ONE_MINUS_CONSTANT_ALPHA)
+            return true;
+      }
+   }
+
+   return false;
+}
+
 static void
 hk_flush_dynamic_state(struct hk_cmd_buffer *cmd, struct hk_cs *cs,
                        uint32_t draw_id, struct agx_draw draw)
@@ -2576,6 +2606,10 @@ hk_flush_dynamic_state(struct hk_cmd_buffer *cmd, struct hk_cs *cs,
       desc->root_dirty = true;
    }
 
+   if (IS_DIRTY(CB_BLEND_EQUATIONS) || IS_DIRTY(CB_BLEND_ENABLES)) {
+      gfx->uses_blend_constant = uses_blend_constant(&dyn->cb);
+   }
+
    if (IS_DIRTY(MS_SAMPLE_MASK)) {
       desc->root.draw.api_sample_mask = dyn->ms.sample_mask;
       desc->root_dirty = true;