Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next

Johan Hedberg says:

====================
Here's the main bluetooth-next pull request for the 5.1 kernel.

 - Fixes & improvements to mediatek, hci_qca, btrtl, and btmrvl HCI drivers
 - Fixes to parsing invalid L2CAP config option sizes
 - Locking fix to bt_accept_enqueue()
 - Add support for new Marvel sd8977 chipset
 - Various other smaller fixes & cleanups
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

13 files changed, 552 insertions, 146 deletions

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 845b0314ce3a..7b2e76e7f22f 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -336,7 +336,7 @@ config BT_MRVL
 	  The core driver to support Marvell Bluetooth devices.
 
 	  This driver is required if you want to support
-	  Marvell Bluetooth devices, such as 8688/8787/8797/8887/8897/8997.
+	  Marvell Bluetooth devices, such as 8688/8787/8797/8887/8897/8977/8997.
 
 	  Say Y here to compile Marvell Bluetooth driver
 	  into the kernel or say M to compile it as module.
@@ -350,7 +350,7 @@ config BT_MRVL_SDIO
 	  The driver for Marvell Bluetooth chipsets with SDIO interface.
 
 	  This driver is required if you want to use Marvell Bluetooth
-	  devices with SDIO interface. Currently SD8688/SD8787/SD8797/SD8887/SD8897/SD8997
+	  devices with SDIO interface. Currently SD8688/SD8787/SD8797/SD8887/SD8897/SD8977/SD8997
 	  chipsets are supported.
 
 	  Say Y here to compile support for Marvell BT-over-SDIO driver
diff --git a/drivers/bluetooth/btmrvl_drv.h b/drivers/bluetooth/btmrvl_drv.h
index f0454541e5fd..fb7729779166 100644
--- a/drivers/bluetooth/btmrvl_drv.h
+++ b/drivers/bluetooth/btmrvl_drv.h
@@ -24,11 +24,9 @@
 #include <linux/slab.h>
 #include <net/bluetooth/bluetooth.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/gfp.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c
index fb3d03928460..047b75ce1deb 100644
--- a/drivers/bluetooth/btmrvl_sdio.c
+++ b/drivers/bluetooth/btmrvl_sdio.c
@@ -62,13 +62,14 @@ static const struct of_device_id btmrvl_sdio_of_match_table[] = {
 static irqreturn_t btmrvl_wake_irq_bt(int irq, void *priv)
 {
 	struct btmrvl_sdio_card *card = priv;
+	struct device *dev = &card->func->dev;
 	struct btmrvl_plt_wake_cfg *cfg = card->plt_wake_cfg;
 
-	pr_info("%s: wake by bt\n", __func__);
+	dev_info(dev, "wake by bt\n");
 	cfg->wake_by_bt = true;
 	disable_irq_nosync(irq);
 
-	pm_wakeup_event(&card->func->dev, 0);
+	pm_wakeup_event(dev, 0);
 	pm_system_wakeup();
 
 	return IRQ_HANDLED;
@@ -87,7 +88,7 @@ static int btmrvl_sdio_probe_of(struct device *dev,
 
 	if (!dev->of_node ||
 	    !of_match_node(btmrvl_sdio_of_match_table, dev->of_node)) {
-		pr_err("sdio platform data not available\n");
+		dev_info(dev, "sdio device tree data not available\n");
 		return -1;
 	}
 
@@ -211,6 +212,29 @@ static const struct btmrvl_sdio_card_reg btmrvl_reg_8897 = {
 	.fw_dump_end = 0xea,
 };
 
+static const struct btmrvl_sdio_card_reg btmrvl_reg_8977 = {
+	.cfg = 0x00,
+	.host_int_mask = 0x08,
+	.host_intstatus = 0x0c,
+	.card_status = 0x5c,
+	.sq_read_base_addr_a0 = 0xf8,
+	.sq_read_base_addr_a1 = 0xf9,
+	.card_revision = 0xc8,
+	.card_fw_status0 = 0xe8,
+	.card_fw_status1 = 0xe9,
+	.card_rx_len = 0xea,
+	.card_rx_unit = 0xeb,
+	.io_port_0 = 0xe4,
+	.io_port_1 = 0xe5,
+	.io_port_2 = 0xe6,
+	.int_read_to_clear = true,
+	.host_int_rsr = 0x04,
+	.card_misc_cfg = 0xD8,
+	.fw_dump_ctrl = 0xf0,
+	.fw_dump_start = 0xf1,
+	.fw_dump_end = 0xf8,
+};
+
 static const struct btmrvl_sdio_card_reg btmrvl_reg_8997 = {
 	.cfg = 0x00,
 	.host_int_mask = 0x08,
@@ -279,6 +303,15 @@ static const struct btmrvl_sdio_device btmrvl_sdio_sd8897 = {
 	.supports_fw_dump = true,
 };
 
+static const struct btmrvl_sdio_device btmrvl_sdio_sd8977 = {
+	.helper         = NULL,
+	.firmware       = "mrvl/sd8977_uapsta.bin",
+	.reg            = &btmrvl_reg_8977,
+	.support_pscan_win_report = true,
+	.sd_blksz_fw_dl = 256,
+	.supports_fw_dump = true,
+};
+
 static const struct btmrvl_sdio_device btmrvl_sdio_sd8997 = {
 	.helper         = NULL,
 	.firmware       = "mrvl/sd8997_uapsta.bin",
@@ -307,6 +340,9 @@ static const struct sdio_device_id btmrvl_sdio_ids[] = {
 	/* Marvell SD8897 Bluetooth device */
 	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x912E),
 			.driver_data = (unsigned long)&btmrvl_sdio_sd8897 },
+	/* Marvell SD8977 Bluetooth device */
+	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x9146),
+			.driver_data = (unsigned long)&btmrvl_sdio_sd8977 },
 	/* Marvell SD8997 Bluetooth device */
 	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL, 0x9142),
 			.driver_data = (unsigned long)&btmrvl_sdio_sd8997 },
@@ -1760,4 +1796,5 @@ MODULE_FIRMWARE("mrvl/sd8787_uapsta.bin");
 MODULE_FIRMWARE("mrvl/sd8797_uapsta.bin");
 MODULE_FIRMWARE("mrvl/sd8887_uapsta.bin");
 MODULE_FIRMWARE("mrvl/sd8897_uapsta.bin");
+MODULE_FIRMWARE("mrvl/sd8977_uapsta.bin");
 MODULE_FIRMWARE("mrvl/sd8997_uapsta.bin");
diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index 4593baff2bc9..e73b1013ba73 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -12,6 +12,7 @@
 #include <linux/atomic.h>
 #include <linux/clk.h>
 #include <linux/firmware.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -37,7 +38,17 @@
 enum {
 	MTK_WMT_PATCH_DWNLD = 0x1,
 	MTK_WMT_FUNC_CTRL = 0x6,
-	MTK_WMT_RST = 0x7
+	MTK_WMT_RST = 0x7,
+	MTK_WMT_SEMAPHORE = 0x17,
+};
+
+enum {
+	BTMTK_WMT_INVALID,
+	BTMTK_WMT_PATCH_UNDONE,
+	BTMTK_WMT_PATCH_DONE,
+	BTMTK_WMT_ON_UNDONE,
+	BTMTK_WMT_ON_DONE,
+	BTMTK_WMT_ON_PROGRESS,
 };
 
 struct mtk_stp_hdr {
@@ -58,6 +69,32 @@ struct mtk_hci_wmt_cmd {
 	u8 data[256];
 } __packed;
 
+struct btmtk_hci_wmt_evt {
+	struct hci_event_hdr hhdr;
+	struct mtk_wmt_hdr whdr;
+} __packed;
+
+struct btmtk_hci_wmt_evt_funcc {
+	struct btmtk_hci_wmt_evt hwhdr;
+	__be16 status;
+} __packed;
+
+struct btmtk_tci_sleep {
+	u8 mode;
+	__le16 duration;
+	__le16 host_duration;
+	u8 host_wakeup_pin;
+	u8 time_compensation;
+} __packed;
+
+struct btmtk_hci_wmt_params {
+	u8 op;
+	u8 flag;
+	u16 dlen;
+	const void *data;
+	u32 *status;
+};
+
 struct btmtkuart_dev {
 	struct hci_dev *hdev;
 	struct serdev_device *serdev;
@@ -68,31 +105,34 @@ struct btmtkuart_dev {
 	struct sk_buff_head txq;
 
 	struct sk_buff *rx_skb;
+	struct sk_buff *evt_skb;
 
 	u8	stp_pad[6];
 	u8	stp_cursor;
 	u16	stp_dlen;
 };
 
-static int mtk_hci_wmt_sync(struct hci_dev *hdev, u8 op, u8 flag, u16 plen,
-			    const void *param)
+static int mtk_hci_wmt_sync(struct hci_dev *hdev,
+			    struct btmtk_hci_wmt_params *wmt_params)
 {
 	struct btmtkuart_dev *bdev = hci_get_drvdata(hdev);
+	struct btmtk_hci_wmt_evt_funcc *wmt_evt_funcc;
+	u32 hlen, status = BTMTK_WMT_INVALID;
+	struct btmtk_hci_wmt_evt *wmt_evt;
 	struct mtk_hci_wmt_cmd wc;
 	struct mtk_wmt_hdr *hdr;
-	u32 hlen;
 	int err;
 
-	hlen = sizeof(*hdr) + plen;
+	hlen = sizeof(*hdr) + wmt_params->dlen;
 	if (hlen > 255)
 		return -EINVAL;
 
 	hdr = (struct mtk_wmt_hdr *)&wc;
 	hdr->dir = 1;
-	hdr->op = op;
-	hdr->dlen = cpu_to_le16(plen + 1);
-	hdr->flag = flag;
-	memcpy(wc.data, param, plen);
+	hdr->op = wmt_params->op;
+	hdr->dlen = cpu_to_le16(wmt_params->dlen + 1);
+	hdr->flag = wmt_params->flag;
+	memcpy(wc.data, wmt_params->data, wmt_params->dlen);
 
 	set_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 
@@ -107,7 +147,7 @@ static int mtk_hci_wmt_sync(struct hci_dev *hdev, u8 op, u8 flag, u16 plen,
 	 * Complete as with usual HCI command flow control.
 	 *
 	 * After sending the command, wait for BTMTKUART_TX_WAIT_VND_EVT
-	 * state to be cleared. The driver speicfic event receive routine
+	 * state to be cleared. The driver specific event receive routine
 	 * will clear that state and with that indicate completion of the
 	 * WMT command.
 	 */
@@ -115,19 +155,56 @@ static int mtk_hci_wmt_sync(struct hci_dev *hdev, u8 op, u8 flag, u16 plen,
 				  TASK_INTERRUPTIBLE, HCI_INIT_TIMEOUT);
 	if (err == -EINTR) {
 		bt_dev_err(hdev, "Execution of wmt command interrupted");
+		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 		return err;
 	}
 
 	if (err) {
 		bt_dev_err(hdev, "Execution of wmt command timed out");
+		clear_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state);
 		return -ETIMEDOUT;
 	}
 
-	return 0;
+	/* Parse and handle the return WMT event */
+	wmt_evt = (struct btmtk_hci_wmt_evt *)bdev->evt_skb->data;
+	if (wmt_evt->whdr.op != hdr->op) {
+		bt_dev_err(hdev, "Wrong op received %d expected %d",
+			   wmt_evt->whdr.op, hdr->op);
+		err = -EIO;
+		goto err_free_skb;
+	}
+
+	switch (wmt_evt->whdr.op) {
+	case MTK_WMT_SEMAPHORE:
+		if (wmt_evt->whdr.flag == 2)
+			status = BTMTK_WMT_PATCH_UNDONE;
+		else
+			status = BTMTK_WMT_PATCH_DONE;
+		break;
+	case MTK_WMT_FUNC_CTRL:
+		wmt_evt_funcc = (struct btmtk_hci_wmt_evt_funcc *)wmt_evt;
+		if (be16_to_cpu(wmt_evt_funcc->status) == 0x404)
+			status = BTMTK_WMT_ON_DONE;
+		else if (be16_to_cpu(wmt_evt_funcc->status) == 0x420)
+			status = BTMTK_WMT_ON_PROGRESS;
+		else
+			status = BTMTK_WMT_ON_UNDONE;
+		break;
+	}
+
+	if (wmt_params->status)
+		*wmt_params->status = status;
+
+err_free_skb:
+	kfree_skb(bdev->evt_skb);
+	bdev->evt_skb = NULL;
+
+	return err;
 }
 
 static int mtk_setup_fw(struct hci_dev *hdev)
 {
+	struct btmtk_hci_wmt_params wmt_params;
 	const struct firmware *fw;
 	const u8 *fw_ptr;
 	size_t fw_size;
@@ -153,6 +230,9 @@ static int mtk_setup_fw(struct hci_dev *hdev)
 	fw_ptr += 30;
 	flag = 1;
 
+	wmt_params.op = MTK_WMT_PATCH_DWNLD;
+	wmt_params.status = NULL;
+
 	while (fw_size > 0) {
 		dlen = min_t(int, 250, fw_size);
 
@@ -162,18 +242,37 @@ static int mtk_setup_fw(struct hci_dev *hdev)
 		else if (fw_size < fw->size - 30)
 			flag = 2;
 
-		err = mtk_hci_wmt_sync(hdev, MTK_WMT_PATCH_DWNLD, flag, dlen,
-				       fw_ptr);
+		wmt_params.flag = flag;
+		wmt_params.dlen = dlen;
+		wmt_params.data = fw_ptr;
+
+		err = mtk_hci_wmt_sync(hdev, &wmt_params);
 		if (err < 0) {
 			bt_dev_err(hdev, "Failed to send wmt patch dwnld (%d)",
 				   err);
-			break;
+			goto free_fw;
 		}
 
 		fw_size -= dlen;
 		fw_ptr += dlen;
 	}
 
+	wmt_params.op = MTK_WMT_RST;
+	wmt_params.flag = 4;
+	wmt_params.dlen = 0;
+	wmt_params.data = NULL;
+	wmt_params.status = NULL;
+
+	/* Activate funciton the firmware providing to */
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
+		goto free_fw;
+	}
+
+	/* Wait a few moments for firmware activation done */
+	usleep_range(10000, 12000);
+
 free_fw:
 	release_firmware(fw);
 	return err;
@@ -192,7 +291,20 @@ static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 	if (hdr->evt == 0xe4)
 		hdr->evt = HCI_EV_VENDOR;
 
+	/* When someone waits for the WMT event, the skb is being cloned
+	 * and being processed the events from there then.
+	 */
+	if (test_bit(BTMTKUART_TX_WAIT_VND_EVT, &bdev->tx_state)) {
+		bdev->evt_skb = skb_clone(skb, GFP_KERNEL);
+		if (!bdev->evt_skb) {
+			err = -ENOMEM;
+			goto err_out;
+		}
+	}
+
 	err = hci_recv_frame(hdev, skb);
+	if (err < 0)
+		goto err_free_skb;
 
 	if (hdr->evt == HCI_EV_VENDOR) {
 		if (test_and_clear_bit(BTMTKUART_TX_WAIT_VND_EVT,
@@ -203,6 +315,13 @@ static int btmtkuart_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
 		}
 	}
 
+	return 0;
+
+err_free_skb:
+	kfree_skb(bdev->evt_skb);
+	bdev->evt_skb = NULL;
+
+err_out:
 	return err;
 }
 
@@ -465,42 +584,134 @@ static int btmtkuart_flush(struct hci_dev *hdev)
 	return 0;
 }
 
+static int btmtkuart_func_query(struct hci_dev *hdev)
+{
+	struct btmtk_hci_wmt_params wmt_params;
+	int status, err;
+	u8 param = 0;
+
+	/* Query whether the function is enabled */
+	wmt_params.op = MTK_WMT_FUNC_CTRL;
+	wmt_params.flag = 4;
+	wmt_params.dlen = sizeof(param);
+	wmt_params.data = &param;
+	wmt_params.status = &status;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to query function status (%d)", err);
+		return err;
+	}
+
+	return status;
+}
+
 static int btmtkuart_setup(struct hci_dev *hdev)
 {
+	struct btmtk_hci_wmt_params wmt_params;
+	ktime_t calltime, delta, rettime;
+	struct btmtk_tci_sleep tci_sleep;
+	unsigned long long duration;
+	struct sk_buff *skb;
+	int err, status;
 	u8 param = 0x1;
-	int err = 0;
+
+	calltime = ktime_get();
+
+	/* Query whether the firmware is already download */
+	wmt_params.op = MTK_WMT_SEMAPHORE;
+	wmt_params.flag = 1;
+	wmt_params.dlen = 0;
+	wmt_params.data = NULL;
+	wmt_params.status = &status;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
+	if (err < 0) {
+		bt_dev_err(hdev, "Failed to query firmware status (%d)", err);
+		return err;
+	}
+
+	if (status == BTMTK_WMT_PATCH_DONE) {
+		bt_dev_info(hdev, "Firmware already downloaded");
+		goto ignore_setup_fw;
+	}
 
 	/* Setup a firmware which the device definitely requires */
 	err = mtk_setup_fw(hdev);
 	if (err < 0)
 		return err;
 
-	/* Activate function the firmware providing to */
-	err = mtk_hci_wmt_sync(hdev, MTK_WMT_RST, 0x4, 0, 0);
-	if (err < 0) {
-		bt_dev_err(hdev, "Failed to send wmt rst (%d)", err);
+ignore_setup_fw:
+	/* Query whether the device is already enabled */
+	err = readx_poll_timeout(btmtkuart_func_query, hdev, status,
+				 status < 0 || status != BTMTK_WMT_ON_PROGRESS,
+				 2000, 5000000);
+	/* -ETIMEDOUT happens */
+	if (err < 0)
 		return err;
+
+	/* The other errors happen in btusb_mtk_func_query */
+	if (status < 0)
+		return status;
+
+	if (status == BTMTK_WMT_ON_DONE) {
+		bt_dev_info(hdev, "function already on");
+		goto ignore_func_on;
 	}
 
 	/* Enable Bluetooth protocol */
-	err = mtk_hci_wmt_sync(hdev, MTK_WMT_FUNC_CTRL, 0x0, sizeof(param),
-			       &param);
+	wmt_params.op = MTK_WMT_FUNC_CTRL;
+	wmt_params.flag = 0;
+	wmt_params.dlen = sizeof(param);
+	wmt_params.data = &param;
+	wmt_params.status = NULL;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
 	if (err < 0) {
 		bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
 		return err;
 	}
 
+ignore_func_on:
+	/* Apply the low power environment setup */
+	tci_sleep.mode = 0x5;
+	tci_sleep.duration = cpu_to_le16(0x640);
+	tci_sleep.host_duration = cpu_to_le16(0x640);
+	tci_sleep.host_wakeup_pin = 0;
+	tci_sleep.time_compensation = 0;
+
+	skb = __hci_cmd_sync(hdev, 0xfc7a, sizeof(tci_sleep), &tci_sleep,
+			     HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "Failed to apply low power setting (%d)", err);
+		return err;
+	}
+	kfree_skb(skb);
+
+	rettime = ktime_get();
+	delta = ktime_sub(rettime, calltime);
+	duration = (unsigned long long)ktime_to_ns(delta) >> 10;
+
+	bt_dev_info(hdev, "Device setup in %llu usecs", duration);
+
 	return 0;
 }
 
 static int btmtkuart_shutdown(struct hci_dev *hdev)
 {
+	struct btmtk_hci_wmt_params wmt_params;
 	u8 param = 0x0;
 	int err;
 
 	/* Disable the device */
-	err = mtk_hci_wmt_sync(hdev, MTK_WMT_FUNC_CTRL, 0x0, sizeof(param),
-			       &param);
+	wmt_params.op = MTK_WMT_FUNC_CTRL;
+	wmt_params.flag = 0;
+	wmt_params.dlen = sizeof(param);
+	wmt_params.data = &param;
+	wmt_params.status = NULL;
+
+	err = mtk_hci_wmt_sync(hdev, &wmt_params);
 	if (err < 0) {
 		bt_dev_err(hdev, "Failed to send wmt func ctrl (%d)", err);
 		return err;
diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index ec9e03a6b778..612268574fc7 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -391,6 +391,25 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
 }
 EXPORT_SYMBOL_GPL(qca_uart_setup);
 
+int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	struct sk_buff *skb;
+	int err;
+
+	skb = __hci_cmd_sync_ev(hdev, EDL_WRITE_BD_ADDR_OPCODE, 6, bdaddr,
+				HCI_EV_VENDOR, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		err = PTR_ERR(skb);
+		bt_dev_err(hdev, "QCA Change address cmd failed (%d)", err);
+		return err;
+	}
+
+	kfree_skb(skb);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qca_set_bdaddr);
+
 MODULE_AUTHOR("Ben Young Tae Kim <ytkim@qca.qualcomm.com>");
 MODULE_DESCRIPTION("Bluetooth support for Qualcomm Atheros family ver " VERSION);
 MODULE_VERSION(VERSION);
diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
index 0c01f375fe83..c72c56ea7480 100644
--- a/drivers/bluetooth/btqca.h
+++ b/drivers/bluetooth/btqca.h
@@ -20,6 +20,7 @@
 
 #define EDL_PATCH_CMD_OPCODE		(0xFC00)
 #define EDL_NVM_ACCESS_OPCODE		(0xFC0B)
+#define EDL_WRITE_BD_ADDR_OPCODE	(0xFC14)
 #define EDL_PATCH_CMD_LEN		(1)
 #define EDL_PATCH_VER_REQ_CMD		(0x19)
 #define EDL_PATCH_TLV_REQ_CMD		(0x1E)
@@ -140,7 +141,7 @@ int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr);
 int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
 		   enum qca_btsoc_type soc_type, u32 soc_ver);
 int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version);
-
+int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr);
 #else
 
 static inline int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr)
@@ -159,4 +160,9 @@ static inline int qca_read_soc_version(struct hci_dev *hdev, u32 *soc_version)
 	return -EOPNOTSUPP;
 }
 
+static inline int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
+{
+	return -EOPNOTSUPP;
+}
+
 #endif
diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 41405de27d66..c91bba00df4e 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -552,10 +552,9 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 					    hdev->bus);
 
 	if (!btrtl_dev->ic_info) {
-		rtl_dev_err(hdev, "rtl: unknown IC info, lmp subver %04x, hci rev %04x, hci ver %04x",
+		rtl_dev_info(hdev, "rtl: unknown IC info, lmp subver %04x, hci rev %04x, hci ver %04x",
 			    lmp_subver, hci_rev, hci_ver);
-		ret = -EINVAL;
-		goto err_free;
+		return btrtl_dev;
 	}
 
 	if (btrtl_dev->ic_info->has_rom_version) {
@@ -610,6 +609,11 @@ int btrtl_download_firmware(struct hci_dev *hdev,
 	 * standard btusb. Once that firmware is uploaded, the subver changes
 	 * to a different value.
 	 */
+	if (!btrtl_dev->ic_info) {
+		rtl_dev_info(hdev, "rtl: assuming no firmware upload needed\n");
+		return 0;
+	}
+
 	switch (btrtl_dev->ic_info->lmp_subver) {
 	case RTL_ROM_LMP_8723A:
 	case RTL_ROM_LMP_3499:
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 4761499db9ee..d4c8d989e714 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -29,6 +29,7 @@
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/suspend.h>
+#include <linux/gpio/consumer.h>
 #include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
@@ -439,6 +440,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
 #define BTUSB_BOOTING		9
 #define BTUSB_DIAG_RUNNING	10
 #define BTUSB_OOB_WAKE_ENABLED	11
+#define BTUSB_HW_RESET_ACTIVE	12
 
 struct btusb_data {
 	struct hci_dev       *hdev;
@@ -476,6 +478,8 @@ struct btusb_data {
 	struct usb_endpoint_descriptor *diag_tx_ep;
 	struct usb_endpoint_descriptor *diag_rx_ep;
 
+	struct gpio_desc *reset_gpio;
+
 	__u8 cmdreq_type;
 	__u8 cmdreq;
 
@@ -489,8 +493,41 @@ struct btusb_data {
 	int (*setup_on_usb)(struct hci_dev *hdev);
 
 	int oob_wake_irq;   /* irq for out-of-band wake-on-bt */
+	unsigned cmd_timeout_cnt;
 };
 
+
+static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+	struct gpio_desc *reset_gpio = data->reset_gpio;
+
+	if (++data->cmd_timeout_cnt < 5)
+		return;
+
+	if (!reset_gpio) {
+		bt_dev_err(hdev, "No way to reset. Ignoring and continuing");
+		return;
+	}
+
+	/*
+	 * Toggle the hard reset line if the platform provides one. The reset
+	 * is going to yank the device off the USB and then replug. So doing
+	 * once is enough. The cleanup is handled correctly on the way out
+	 * (standard USB disconnect), and the new device is detected cleanly
+	 * and bound to the driver again like it should be.
+	 */
+	if (test_and_set_bit(BTUSB_HW_RESET_ACTIVE, &data->flags)) {
+		bt_dev_err(hdev, "last reset failed? Not resetting again");
+		return;
+	}
+
+	bt_dev_err(hdev, "Initiating HW reset via gpio");
+	gpiod_set_value_cansleep(reset_gpio, 1);
+	msleep(100);
+	gpiod_set_value_cansleep(reset_gpio, 0);
+}
+
 static inline void btusb_free_frags(struct btusb_data *data)
 {
 	unsigned long flags;
@@ -2397,6 +2434,24 @@ static int btusb_shutdown_intel(struct hci_dev *hdev)
 	return 0;
 }
 
+static int btusb_shutdown_intel_new(struct hci_dev *hdev)
+{
+	struct sk_buff *skb;
+
+	/* Send HCI Reset to the controller to stop any BT activity which
+	 * were triggered. This will help to save power and maintain the
+	 * sync b/w Host and controller
+	 */
+	skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
+	if (IS_ERR(skb)) {
+		bt_dev_err(hdev, "HCI reset during shutdown failed");
+		return PTR_ERR(skb);
+	}
+	kfree_skb(skb);
+
+	return 0;
+}
+
 #ifdef CONFIG_PM
 /* Configure an out-of-band gpio as wake-up pin, if specified in device tree */
 static int marvell_config_oob_wake(struct hci_dev *hdev)
@@ -2915,6 +2970,7 @@ static int btusb_probe(struct usb_interface *intf,
 		       const struct usb_device_id *id)
 {
 	struct usb_endpoint_descriptor *ep_desc;
+	struct gpio_desc *reset_gpio;
 	struct btusb_data *data;
 	struct hci_dev *hdev;
 	unsigned ifnum_base;
@@ -3028,6 +3084,15 @@ static int btusb_probe(struct usb_interface *intf,
 
 	SET_HCIDEV_DEV(hdev, &intf->dev);
 
+	reset_gpio = gpiod_get_optional(&data->udev->dev, "reset",
+					GPIOD_OUT_LOW);
+	if (IS_ERR(reset_gpio)) {
+		err = PTR_ERR(reset_gpio);
+		goto out_free_dev;
+	} else if (reset_gpio) {
+		data->reset_gpio = reset_gpio;
+	}
+
 	hdev->open   = btusb_open;
 	hdev->close  = btusb_close;
 	hdev->flush  = btusb_flush;
@@ -3082,6 +3147,7 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->shutdown = btusb_shutdown_intel;
 		hdev->set_diag = btintel_set_diag_mfg;
 		hdev->set_bdaddr = btintel_set_bdaddr;
+		hdev->cmd_timeout = btusb_intel_cmd_timeout;
 		set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
 		set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
 		set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks);
@@ -3091,9 +3157,11 @@ static int btusb_probe(struct usb_interface *intf,
 		hdev->manufacturer = 2;
 		hdev->send = btusb_send_frame_intel;
 		hdev->setup = btusb_setup_intel_new;
+		hdev->shutdown = btusb_shutdown_intel_new;
 		hdev->hw_error = btintel_hw_error;
 		hdev->set_diag = btintel_set_diag;
 		hdev->set_bdaddr = btintel_set_bdaddr;
+		hdev->cmd_timeout = btusb_intel_cmd_timeout;
 		set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
 		set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks);
 		set_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks);
@@ -3226,6 +3294,8 @@ static int btusb_probe(struct usb_interface *intf,
 	return 0;
 
 out_free_dev:
+	if (data->reset_gpio)
+		gpiod_put(data->reset_gpio);
 	hci_free_dev(hdev);
 	return err;
 }
@@ -3269,6 +3339,9 @@ static void btusb_disconnect(struct usb_interface *intf)
 	if (data->oob_wake_irq)
 		device_init_wakeup(&data->udev->dev, false);
 
+	if (data->reset_gpio)
+		gpiod_put(data->reset_gpio);
+
 	hci_free_dev(hdev);
 }
 
diff --git a/drivers/bluetooth/h4_recv.h b/drivers/bluetooth/h4_recv.h
index b432651f8236..87ccaceadba7 100644
--- a/drivers/bluetooth/h4_recv.h
+++ b/drivers/bluetooth/h4_recv.h
@@ -60,12 +60,13 @@ static inline struct sk_buff *h4_recv_buf(struct hci_dev *hdev,
 					  const struct h4_recv_pkt *pkts,
 					  int pkts_count)
 {
+	/* Check for error from previous call */
+	if (IS_ERR(skb))
+		skb = NULL;
+
 	while (count) {
 		int i, len;
 
-		if (!count)
-			break;
-
 		if (!skb) {
 			for (i = 0; i < pkts_count; i++) {
 				if (buffer[0] != (&pkts[i])->type)
diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c
index fb97a3bf069b..5d97d77627c1 100644
--- a/drivers/bluetooth/hci_h4.c
+++ b/drivers/bluetooth/hci_h4.c
@@ -174,6 +174,10 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	u8 alignment = hu->alignment ? hu->alignment : 1;
 
+	/* Check for error from previous call */
+	if (IS_ERR(skb))
+		skb = NULL;
+
 	while (count) {
 		int i, len;
 
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index fbf7b4df23ab..4918fefc4a6f 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -207,11 +207,11 @@ void hci_uart_init_work(struct work_struct *work)
 	err = hci_register_dev(hu->hdev);
 	if (err < 0) {
 		BT_ERR("Can't register HCI device");
+		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
+		hu->proto->close(hu);
 		hdev = hu->hdev;
 		hu->hdev = NULL;
 		hci_free_dev(hdev);
-		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
-		hu->proto->close(hu);
 		return;
 	}
 
@@ -616,6 +616,7 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 static int hci_uart_register_dev(struct hci_uart *hu)
 {
 	struct hci_dev *hdev;
+	int err;
 
 	BT_DBG("");
 
@@ -659,11 +660,22 @@ static int hci_uart_register_dev(struct hci_uart *hu)
 	else
 		hdev->dev_type = HCI_PRIMARY;
 
+	/* Only call open() for the protocol after hdev is fully initialized as
+	 * open() (or a timer/workqueue it starts) may attempt to reference it.
+	 */
+	err = hu->proto->open(hu);
+	if (err) {
+		hu->hdev = NULL;
+		hci_free_dev(hdev);
+		return err;
+	}
+
 	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
 		return 0;
 
 	if (hci_register_dev(hdev) < 0) {
 		BT_ERR("Can't register HCI device");
+		hu->proto->close(hu);
 		hu->hdev = NULL;
 		hci_free_dev(hdev);
 		return -ENODEV;
@@ -683,17 +695,12 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
 	if (!p)
 		return -EPROTONOSUPPORT;
 
-	err = p->open(hu);
-	if (err)
-		return err;
-
 	hu->proto = p;
 	set_bit(HCI_UART_PROTO_READY, &hu->flags);
 
 	err = hci_uart_register_dev(hu);
 	if (err) {
 		clear_bit(HCI_UART_PROTO_READY, &hu->flags);
-		p->close(hu);
 		return err;
 	}
 
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index f036c8f98ea3..5e03504c4e0c 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -60,6 +60,7 @@
 #define IBS_WAKE_RETRANS_TIMEOUT_MS	100
 #define IBS_TX_IDLE_TIMEOUT_MS		2000
 #define BAUDRATE_SETTLE_TIMEOUT_MS	300
+#define POWER_PULSE_TRANS_TIMEOUT_MS	100
 
 /* susclk rate */
 #define SUSCLK_RATE_32KHZ	32768
@@ -770,16 +771,17 @@ static int qca_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 	/* Prepend skb with frame type */
 	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 
+	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
+
 	/* Don't go to sleep in middle of patch download or
 	 * Out-Of-Band(GPIOs control) sleep is selected.
 	 */
 	if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) {
 		skb_queue_tail(&qca->txq, skb);
+		spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 		return 0;
 	}
 
-	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
-
 	/* Act according to current state */
 	switch (qca->tx_ibs_state) {
 	case HCI_IBS_TX_AWAKE:
@@ -963,7 +965,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 	struct hci_uart *hu = hci_get_drvdata(hdev);
 	struct qca_data *qca = hu->priv;
 	struct sk_buff *skb;
-	struct qca_serdev *qcadev;
 	u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
 
 	if (baudrate > QCA_BAUDRATE_3200000)
@@ -977,13 +978,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 		return -ENOMEM;
 	}
 
-	/* Disabling hardware flow control is mandatory while
-	 * sending change baudrate request to wcn3990 SoC.
-	 */
-	qcadev = serdev_device_get_drvdata(hu->serdev);
-	if (qcadev->btsoc_type == QCA_WCN3990)
-		hci_uart_set_flow_control(hu, true);
-
 	/* Assign commands to change baudrate and packet type. */
 	skb_put_data(skb, cmd, sizeof(cmd));
 	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
@@ -999,9 +993,6 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
 	schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
 	set_current_state(TASK_RUNNING);
 
-	if (qcadev->btsoc_type == QCA_WCN3990)
-		hci_uart_set_flow_control(hu, false);
-
 	return 0;
 }
 
@@ -1013,11 +1004,10 @@ static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
 		hci_uart_set_baudrate(hu, speed);
 }
 
-static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
+static int qca_send_power_pulse(struct hci_uart *hu, u8 cmd)
 {
-	struct hci_uart *hu = hci_get_drvdata(hdev);
-	struct qca_data *qca = hu->priv;
-	struct sk_buff *skb;
+	int ret;
+	int timeout = msecs_to_jiffies(POWER_PULSE_TRANS_TIMEOUT_MS);
 
 	/* These power pulses are single byte command which are sent
 	 * at required baudrate to wcn3990. On wcn3990, we have an external
@@ -1029,19 +1019,17 @@ static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
 	 * save power. Disabling hardware flow control is mandatory while
 	 * sending power pulses to SoC.
 	 */
-	bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
-
-	skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
-	if (!skb)
-		return -ENOMEM;
+	bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);
 
+	serdev_device_write_flush(hu->serdev);
 	hci_uart_set_flow_control(hu, true);
+	ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
+	if (ret < 0) {
+		bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
+		return ret;
+	}
 
-	skb_put_u8(skb, cmd);
-	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
-
-	skb_queue_tail(&qca->txq, skb);
-	hci_uart_tx_wakeup(hu);
+	serdev_device_wait_until_sent(hu->serdev, timeout);
 
 	/* Wait for 100 uS for SoC to settle down */
 	usleep_range(100, 200);
@@ -1091,7 +1079,8 @@ static int qca_check_speeds(struct hci_uart *hu)
 static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 {
 	unsigned int speed, qca_baudrate;
-	int ret;
+	struct qca_serdev *qcadev;
+	int ret = 0;
 
 	if (speed_type == QCA_INIT_SPEED) {
 		speed = qca_get_speed(hu, QCA_INIT_SPEED);
@@ -1102,21 +1091,31 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
 		if (!speed)
 			return 0;
 
+		/* Disable flow control for wcn3990 to deassert RTS while
+		 * changing the baudrate of chip and host.
+		 */
+		qcadev = serdev_device_get_drvdata(hu->serdev);
+		if (qcadev->btsoc_type == QCA_WCN3990)
+			hci_uart_set_flow_control(hu, true);
+
 		qca_baudrate = qca_get_baudrate_value(speed);
 		bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
 		ret = qca_set_baudrate(hu->hdev, qca_baudrate);
 		if (ret)
-			return ret;
+			goto error;
 
 		host_set_baudrate(hu, speed);
+
+error:
+		if (qcadev->btsoc_type == QCA_WCN3990)
+			hci_uart_set_flow_control(hu, false);
 	}
 
-	return 0;
+	return ret;
 }
 
 static int qca_wcn3990_init(struct hci_uart *hu)
 {
-	struct hci_dev *hdev = hu->hdev;
 	struct qca_serdev *qcadev;
 	int ret;
 
@@ -1139,12 +1138,12 @@ static int qca_wcn3990_init(struct hci_uart *hu)
 
 	/* Forcefully enable wcn3990 to enter in to boot mode. */
 	host_set_baudrate(hu, 2400);
-	ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWEROFF_PULSE);
+	ret = qca_send_power_pulse(hu, QCA_WCN3990_POWEROFF_PULSE);
 	if (ret)
 		return ret;
 
 	qca_set_speed(hu, QCA_INIT_SPEED);
-	ret = qca_send_power_pulse(hdev, QCA_WCN3990_POWERON_PULSE);
+	ret = qca_send_power_pulse(hu, QCA_WCN3990_POWERON_PULSE);
 	if (ret)
 		return ret;
 
@@ -1241,7 +1240,10 @@ static int qca_setup(struct hci_uart *hu)
 	}
 
 	/* Setup bdaddr */
-	hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
+	if (qcadev->btsoc_type == QCA_WCN3990)
+		hu->hdev->set_bdaddr = qca_set_bdaddr;
+	else
+		hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
 
 	return ret;
 }
@@ -1274,13 +1276,20 @@ static const struct qca_vreg_data qca_soc_data = {
 
 static void qca_power_shutdown(struct hci_uart *hu)
 {
-	struct serdev_device *serdev = hu->serdev;
-	unsigned char cmd = QCA_WCN3990_POWEROFF_PULSE;
+	struct qca_data *qca = hu->priv;
+	unsigned long flags;
+
+	/* From this point we go into power off state. But serial port is
+	 * still open, stop queueing the IBS data and flush all the buffered
+	 * data in skb's.
+	 */
+	spin_lock_irqsave(&qca->hci_ibs_lock, flags);
+	clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+	qca_flush(hu);
+	spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
 
 	host_set_baudrate(hu, 2400);
-	hci_uart_set_flow_control(hu, true);
-	serdev_device_write_buf(serdev, &cmd, sizeof(cmd));
-	hci_uart_set_flow_control(hu, false);
+	qca_send_power_pulse(hu, QCA_WCN3990_POWEROFF_PULSE);
 	qca_power_setup(hu, false);
 }
 
diff --git a/drivers/usb/core/usb-acpi.c b/drivers/usb/core/usb-acpi.c
index e221861b3187..9043d7242d67 100644
--- a/drivers/usb/core/usb-acpi.c
+++ b/drivers/usb/core/usb-acpi.c
@@ -139,86 +139,123 @@ static struct acpi_device *usb_acpi_find_port(struct acpi_device *parent,
 	return acpi_find_child_device(parent, raw, false);
 }
 
-static struct acpi_device *usb_acpi_find_companion(struct device *dev)
+static struct acpi_device *
+usb_acpi_get_companion_for_port(struct usb_port *port_dev)
 {
 	struct usb_device *udev;
 	struct acpi_device *adev;
 	acpi_handle *parent_handle;
+	int port1;
+
+	/* Get the struct usb_device point of port's hub */
+	udev = to_usb_device(port_dev->dev.parent->parent);
 
 	/*
-	 * In the ACPI DSDT table, only usb root hub and usb ports are
-	 * acpi device nodes. The hierarchy like following.
-	 * Device (EHC1)
-	 *	Device (HUBN)
-	 *		Device (PR01)
-	 *			Device (PR11)
-	 *			Device (PR12)
-	 *			Device (PR13)
-	 *			...
-	 * So all binding process is divided into two parts. binding
-	 * root hub and usb ports.
+	 * The root hub ports' parent is the root hub. The non-root-hub
+	 * ports' parent is the parent hub port which the hub is
+	 * connected to.
 	 */
-	if (is_usb_device(dev)) {
-		udev = to_usb_device(dev);
-		if (udev->parent)
+	if (!udev->parent) {
+		adev = ACPI_COMPANION(&udev->dev);
+		port1 = usb_hcd_find_raw_port_number(bus_to_hcd(udev->bus),
+						     port_dev->portnum);
+	} else {
+		parent_handle = usb_get_hub_port_acpi_handle(udev->parent,
+							     udev->portnum);
+		if (!parent_handle)
 			return NULL;
 
-		/* root hub is only child (_ADR=0) under its parent, the HC */
-		adev = ACPI_COMPANION(dev->parent);
-		return acpi_find_child_device(adev, 0, false);
-	} else if (is_usb_port(dev)) {
-		struct usb_port *port_dev = to_usb_port(dev);
-		int port1 = port_dev->portnum;
-		struct acpi_pld_info *pld;
-		acpi_handle *handle;
-		acpi_status status;
-
-		/* Get the struct usb_device point of port's hub */
-		udev = to_usb_device(dev->parent->parent);
-
-		/*
-		 * The root hub ports' parent is the root hub. The non-root-hub
-		 * ports' parent is the parent hub port which the hub is
-		 * connected to.
-		 */
-		if (!udev->parent) {
-			struct usb_hcd *hcd = bus_to_hcd(udev->bus);
-			int raw;
-
-			raw = usb_hcd_find_raw_port_number(hcd, port1);
-
-			adev = usb_acpi_find_port(ACPI_COMPANION(&udev->dev),
-						  raw);
-
-			if (!adev)
-				return NULL;
-		} else {
-			parent_handle =
-				usb_get_hub_port_acpi_handle(udev->parent,
-				udev->portnum);
-			if (!parent_handle)
-				return NULL;
-
-			acpi_bus_get_device(parent_handle, &adev);
-
-			adev = usb_acpi_find_port(adev, port1);
-
-			if (!adev)
-				return NULL;
-		}
-		handle = adev->handle;
-		status = acpi_get_physical_device_location(handle, &pld);
-		if (ACPI_FAILURE(status) || !pld)
-			return adev;
+		acpi_bus_get_device(parent_handle, &adev);
+		port1 = port_dev->portnum;
+	}
 
+	return usb_acpi_find_port(adev, port1);
+}
+
+static struct acpi_device *
+usb_acpi_find_companion_for_port(struct usb_port *port_dev)
+{
+	struct acpi_device *adev;
+	struct acpi_pld_info *pld;
+	acpi_handle *handle;
+	acpi_status status;
+
+	adev = usb_acpi_get_companion_for_port(port_dev);
+	if (!adev)
+		return NULL;
+
+	handle = adev->handle;
+	status = acpi_get_physical_device_location(handle, &pld);
+	if (!ACPI_FAILURE(status) && pld) {
 		port_dev->location = USB_ACPI_LOCATION_VALID
 			| pld->group_token << 8 | pld->group_position;
 		port_dev->connect_type = usb_acpi_get_connect_type(handle, pld);
 		ACPI_FREE(pld);
+	}
 
-		return adev;
+	return adev;
+}
+
+static struct acpi_device *
+usb_acpi_find_companion_for_device(struct usb_device *udev)
+{
+	struct acpi_device *adev;
+	struct usb_port *port_dev;
+	struct usb_hub *hub;
+
+	if (!udev->parent) {
+		/* root hub is only child (_ADR=0) under its parent, the HC */
+		adev = ACPI_COMPANION(udev->dev.parent);
+		return acpi_find_child_device(adev, 0, false);
 	}
 
+	hub = usb_hub_to_struct_hub(udev->parent);
+	if (!hub)
+		return NULL;
+
+	/*
+	 * This is an embedded USB device connected to a port and such
+	 * devices share port's ACPI companion.
+	 */
+	port_dev = hub->ports[udev->portnum - 1];
+	return usb_acpi_get_companion_for_port(port_dev);
+}
+
+static struct acpi_device *usb_acpi_find_companion(struct device *dev)
+{
+	/*
+	 * The USB hierarchy like following:
+	 *
+	 * Device (EHC1)
+	 *	Device (HUBN)
+	 *		Device (PR01)
+	 *			Device (PR11)
+	 *			Device (PR12)
+	 *				Device (FN12)
+	 *				Device (FN13)
+	 *			Device (PR13)
+	 *			...
+	 * where HUBN is root hub, and PRNN are USB ports and devices
+	 * connected to them, and FNNN are individualk functions for
+	 * connected composite USB devices. PRNN and FNNN may contain
+	 * _CRS and other methods describing sideband resources for
+	 * the connected device.
+	 *
+	 * On the kernel side both root hub and embedded USB devices are
+	 * represented as instances of usb_device structure, and ports
+	 * are represented as usb_port structures, so the whole process
+	 * is split into 2 parts: finding companions for devices and
+	 * finding companions for ports.
+	 *
+	 * Note that we do not handle individual functions of composite
+	 * devices yet, for that we would need to assign companions to
+	 * devices corresponding to USB interfaces.
+	 */
+	if (is_usb_device(dev))
+		return usb_acpi_find_companion_for_device(to_usb_device(dev));
+	else if (is_usb_port(dev))
+		return usb_acpi_find_companion_for_port(to_usb_port(dev));
+
 	return NULL;
 }