mt76: introduce __mt76_mcu_send_firmware routine

Introduce __mt76_mcu_send_firmware routine to specify mcu message max
length. This is a preliminary patch to support mt7921s driver.
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mcu.c

@@ -106,13 +106,13 @@ int mt76_mcu_skb_send_and_get_msg(struct mt76_dev *dev, struct sk_buff *skb,
 }
 EXPORT_SYMBOL_GPL(mt76_mcu_skb_send_and_get_msg);
 
-int mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
-			   int len)
+int __mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
+			     int len, int max_len)
 {
 	int err, cur_len;
 
 	while (len > 0) {
-		cur_len = min_t(int, 4096 - dev->mcu_ops->headroom, len);
+		cur_len = min_t(int, max_len - dev->mcu_ops->headroom, len);
 
 		err = mt76_mcu_send_msg(dev, cmd, data, cur_len, false);
 		if (err)
@@ -129,4 +129,4 @@ int mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(mt76_mcu_send_firmware);
+EXPORT_SYMBOL_GPL(__mt76_mcu_send_firmware);

drivers/net/wireless/mediatek/mt76/mt76.h

@@ -1258,8 +1258,15 @@ int mt76_mcu_send_and_get_msg(struct mt76_dev *dev, int cmd, const void *data,
 			      int len, bool wait_resp, struct sk_buff **ret);
 int mt76_mcu_skb_send_and_get_msg(struct mt76_dev *dev, struct sk_buff *skb,
 				  int cmd, bool wait_resp, struct sk_buff **ret);
-int mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
-			   int len);
+int __mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
+			     int len, int max_len);
+static inline int
+mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
+		       int len)
+{
+	return __mt76_mcu_send_firmware(dev, cmd, data, len, 4096);
+}
+
 static inline int
 mt76_mcu_send_msg(struct mt76_dev *dev, int cmd, const void *data, int len,
 		  bool wait_resp)

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c

@@ -716,8 +716,8 @@ static int mt7921_load_patch(struct mt7921_dev *dev)
 			goto out;
 		}
 
-		ret = mt76_mcu_send_firmware(&dev->mt76, MCU_CMD_FW_SCATTER,
-					     dl, len);
+		ret = __mt76_mcu_send_firmware(&dev->mt76, MCU_CMD_FW_SCATTER,
+					       dl, len, 4096);
 		if (ret) {
 			dev_err(dev->mt76.dev, "Failed to send patch\n");
 			goto out;
@@ -788,8 +788,8 @@ mt7921_mcu_send_ram_firmware(struct mt7921_dev *dev,
 			return err;
 		}
 
-		err = mt76_mcu_send_firmware(&dev->mt76, MCU_CMD_FW_SCATTER,
-					     data + offset, len);
+		err = __mt76_mcu_send_firmware(&dev->mt76, MCU_CMD_FW_SCATTER,
+					       data + offset, len, 4096);
 		if (err) {
 			dev_err(dev->mt76.dev, "Failed to send firmware.\n");
 			return err;