Bluetooth: btmrvl: implement read-to-clear for SD8897 interrupts

For SD8897, CMD52 write_to_clear may have missing interrupts
under certain corner case condition. Use CMD53 read-to-clear
to fix the problem.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c
index 2c4997ce2484..5c0b9444b5e1 100644
--- a/drivers/bluetooth/btmrvl_main.c
+++ b/drivers/bluetooth/btmrvl_main.c
@@ -24,6 +24,7 @@
 #include <net/bluetooth/hci_core.h>
 
 #include "btmrvl_drv.h"
+#include "btmrvl_sdio.h"
 
 #define VERSION "1.0"
 
@@ -337,10 +338,25 @@ static int btmrvl_tx_pkt(struct btmrvl_private *priv, struct sk_buff *skb)
 
 static void btmrvl_init_adapter(struct btmrvl_private *priv)
 {
+        int buf_size;
+
         skb_queue_head_init(&priv->adapter->tx_queue);
 
         priv->adapter->ps_state = PS_AWAKE;
 
+        buf_size = ALIGN_SZ(SDIO_BLOCK_SIZE, BTSDIO_DMA_ALIGN);
+        priv->adapter->hw_regs_buf = kzalloc(buf_size, GFP_KERNEL);
+        if (!priv->adapter->hw_regs_buf) {
+                priv->adapter->hw_regs = NULL;
+                BT_ERR("Unable to allocate buffer for hw_regs.");
+        } else {
+                priv->adapter->hw_regs =
+                        (u8 *)ALIGN_ADDR(priv->adapter->hw_regs_buf,
+                                         BTSDIO_DMA_ALIGN);
+                BT_DBG("hw_regs_buf=%p hw_regs=%p",
+                       priv->adapter->hw_regs_buf, priv->adapter->hw_regs);
+        }
+
         init_waitqueue_head(&priv->adapter->cmd_wait_q);
 }
 
@@ -348,6 +364,7 @@ static void btmrvl_free_adapter(struct btmrvl_private *priv)
 {
         skb_queue_purge(&priv->adapter->tx_queue);
 
+        kfree(priv->adapter->hw_regs_buf);
         kfree(priv->adapter);
 
         priv->adapter = NULL;