Bluetooth: btusb: Trigger Intel FW download error recovery

Sometimes during FW data download stage, in case of an error is
encountered the controller device could not be recovered. To recover
from such failures send Intel hard Reset to re-trigger FW download in
following error scenarios:

1. Intel Read version command error
2. Firmware download timeout
3. Failure in Intel Soft Reset for switching to operational FW
4. Boot timeout for switching to operaional FW

Signed-off-by: Raghuram Hegde <raghuram.hegde@intel.com>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Amit K Bag <amit.k.bag@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c
index bb99c8653aab..62e781a18bf0 100644
--- a/drivers/bluetooth/btintel.c
+++ b/drivers/bluetooth/btintel.c
@@ -709,6 +709,51 @@ done:
 }
 EXPORT_SYMBOL_GPL(btintel_download_firmware);
 
+void btintel_reset_to_bootloader(struct hci_dev *hdev)
+{
+	struct intel_reset params;
+	struct sk_buff *skb;
+
+	/* Send Intel Reset command. This will result in
+	 * re-enumeration of BT controller.
+	 *
+	 * Intel Reset parameter description:
+	 * reset_type :   0x00 (Soft reset),
+	 *		  0x01 (Hard reset)
+	 * patch_enable : 0x00 (Do not enable),
+	 *		  0x01 (Enable)
+	 * ddc_reload :   0x00 (Do not reload),
+	 *		  0x01 (Reload)
+	 * boot_option:   0x00 (Current image),
+	 *                0x01 (Specified boot address)
+	 * boot_param:    Boot address
+	 *
+	 */
+	params.reset_type = 0x01;
+	params.patch_enable = 0x01;
+	params.ddc_reload = 0x01;
+	params.boot_option = 0x00;
+	params.boot_param = cpu_to_le32(0x00000000);
+
+	skb = __hci_cmd_sync(hdev, 0xfc01, sizeof(params),
+			     &params, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "FW download error recovery failed (%ld)",
+			   PTR_ERR(skb));
+		return;
+	}
+	bt_dev_info(hdev, "Intel reset sent to retry FW download");
+	kfree_skb(skb);
+
+	/* Current Intel BT controllers(ThP/JfP) hold the USB reset
+	 * lines for 2ms when it receives Intel Reset in bootloader mode.
+	 * Whereas, the upcoming Intel BT controllers will hold USB reset
+	 * for 150ms. To keep the delay generic, 150ms is chosen here.
+	 */
+	msleep(150);
+}
+EXPORT_SYMBOL_GPL(btintel_reset_to_bootloader);
+
 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 MODULE_DESCRIPTION("Bluetooth support for Intel devices ver " VERSION);
 MODULE_VERSION(VERSION);