diff --git a/llms/mlx_lm/models/mamba2.py b/llms/mlx_lm/models/mamba2.py
index 3360a615..141ffeee 100644
--- a/llms/mlx_lm/models/mamba2.py
+++ b/llms/mlx_lm/models/mamba2.py
@@ -89,63 +89,29 @@ def ssd(x, A, B, C, chunk_size):
 
 
 class DepthWiseConv1d(nn.Module):
-    def __init__(self, in_channels, out_channels, kernel_size, bias=True, groups=None, padding=0):
+    def __init__(self, channels, kernel_size, bias=True, padding=0):
         super().__init__()
-        self.in_channels = in_channels
-        self.out_channels = out_channels
+        self.channels = channels
         self.kernel_size = kernel_size
         self.padding = padding
-        self.groups = groups if groups is not None else in_channels
-        
-        assert in_channels == out_channels, "In and out channels must be same for depthwise convolution"
-        assert self.groups == in_channels, "Groups must be equal to in_channels for depthwise convolution"
-        
-        self.weight = mx.random.normal((in_channels, 1, kernel_size))
-        self.bias = mx.zeros((out_channels,)) if bias else None
+        self.weight = mx.random.normal((self.channels, kernel_size, 1))
+        self.bias = mx.zeros((channels,)) if bias else None
 
-    def __call__(self, x: mx.array, cache=None) -> mx.array:
+    def __call__(self, x, cache=None):
         B, L, C = x.shape
-        K = self.kernel_size
+        groups, K, _ = self.weight.shape
 
-        assert C == self.in_channels, f"Input channels {C} doesn't match expected {self.in_channels}"
-        
         if cache is not None:
-            # Access conv_state directly from cache[0]
-            if cache[0] is None:
-                cache[0] = mx.zeros((B, K-1, C))
+            x = mx.concatenate([cache, x], axis=1)
+        else:
+            x = mx.pad(x, [(0, 0), (K - 1, 0), (0, 0)])
 
-            x = mx.concatenate([cache[0], x], axis=1)
-
-        outputs = []
-        for c in range(C):
-            x_c = x[:, :, c]
-            x_c = mx.expand_dims(x_c, axis=1)
-
-            w_c = self.weight[c]
-            if w_c.ndim == 2:
-                w_c = mx.expand_dims(w_c, axis=0)
-            elif w_c.ndim == 1:
-                w_c = mx.expand_dims(mx.expand_dims(w_c, axis=0), axis=0)
-
-            y_c = mx.conv_general(
-                x_c,
-                w_c,
-                stride=1,
-                padding=0
-            )
-            if self.bias is not None:
-                y_c = y_c + self.bias[c]
-            
-            y_c = mx.squeeze(y_c, axis=1)
-            outputs.append(y_c)
+        y = mx.conv_general(x, self.weight, groups=groups)
         
-        y = mx.stack(outputs, axis=-1)
+        if self.bias is not None:
+            y = y + self.bias
 
-        # Update cache directly using cache[0]
-        if cache is not None:
-            cache[0] = x[:, -K+1:, :] if x.shape[1] >= K else x
-
-        return y
+        return y, x[:, -K + 1:, :]
 
 
 class Mamba2Block(nn.Module):
@@ -169,11 +135,9 @@ class Mamba2Block(nn.Module):
         # Convolution
         conv_dim = self.d_inner + 2 * self.d_state
         self.conv1d = DepthWiseConv1d(
-            in_channels=conv_dim,
-            out_channels=conv_dim,
+            channels=conv_dim,
             kernel_size=self.d_conv,
-            bias=args.use_conv_bias,
-            groups=conv_dim
+            bias=args.use_conv_bias
         )
         
         # SSM parameters
@@ -206,7 +170,9 @@ class Mamba2Block(nn.Module):
         dt = mx.maximum(dt, self.args.time_step_floor)
         
         # Convolution and activation
-        x_conv = self.conv1d(x_conv, cache=[cache[0] if cache else None])
+        x_conv, conv_state = self.conv1d(x_conv, cache[0] if cache else None)
+        if cache is not None:
+            cache[0] = conv_state
         x_conv = silu(x_conv)
         
         # Split conv output
@@ -328,6 +294,12 @@ class Model(nn.Module):
             logits = self.lm_head(hidden)
         
         return logits
+    
+    def sanitize(self, weights):
+        for k, v in weights.items():
+            if "conv1d.weight" in k and v.shape[-1] != 1:
+                weights[k] = v.moveaxis(2, 1)
+        return weights
 
     def make_cache(self):
         return [MambaCache() for _ in range(len(self.layers))]