Re: [PATCH v3] Bluetooth: btrtl: Add Realtek devcoredump support
From: Luiz Augusto von Dentz
Date: Thu Apr 20 2023 - 19:12:44 EST
Hi,
On Thu, Apr 20, 2023 at 3:53 AM <hildawu@xxxxxxxxxxx> wrote:
>
> From: Hilda Wu <hildawu@xxxxxxxxxxx>
>
> Catch debug exception from controller and driver, and trigger a
> devcoredump using hci devcoredump APIs. The debug exception data
> will be parsed in userspace.
>
> Signed-off-by: Alex Lu <alex_lu@xxxxxxxxxxxxxx>
> Signed-off-by: Hilda Wu <hildawu@xxxxxxxxxxx>
> ---
> Changes in v3:
> - Rebase, fixed merge confilt
>
> Changes in v2:
> - According to devcoredump API revision, modified related part.
> ---
> ---
> drivers/bluetooth/btrtl.c | 145 +++++++++++++++++++++++++++++++-------
> drivers/bluetooth/btrtl.h | 6 ++
> drivers/bluetooth/btusb.c | 74 +++++++++++++++++++
> 3 files changed, 198 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
> index 2915c82d719d..ffb94d6481e2 100644
> --- a/drivers/bluetooth/btrtl.c
> +++ b/drivers/bluetooth/btrtl.c
> @@ -32,6 +32,8 @@
> #define RTL_ROM_LMP_8851B 0x8851
> #define RTL_CONFIG_MAGIC 0x8723ab55
>
> +#define RTL_VSC_OP_COREDUMP 0xfcff
> +
> #define IC_MATCH_FL_LMPSUBV (1 << 0)
> #define IC_MATCH_FL_HCIREV (1 << 1)
> #define IC_MATCH_FL_HCIVER (1 << 2)
> @@ -81,6 +83,7 @@ struct id_table {
> bool has_msft_ext;
> char *fw_name;
> char *cfg_name;
> + char *hw_info;
> };
>
> struct btrtl_device_info {
> @@ -102,21 +105,24 @@ static const struct id_table ic_id_table[] = {
> .config_needed = false,
> .has_rom_version = false,
> .fw_name = "rtl_bt/rtl8723a_fw.bin",
> - .cfg_name = NULL },
> + .cfg_name = NULL,
> + .hw_info = "rtl8723au" },
>
> /* 8723BS */
> { IC_INFO(RTL_ROM_LMP_8723B, 0xb, 0x6, HCI_UART),
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723bs_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723bs_config" },
> + .cfg_name = "rtl_bt/rtl8723bs_config",
> + .hw_info = "rtl8723bs" },
>
> /* 8723B */
> { IC_INFO(RTL_ROM_LMP_8723B, 0xb, 0x6, HCI_USB),
> .config_needed = false,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723b_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723b_config" },
> + .cfg_name = "rtl_bt/rtl8723b_config",
> + .hw_info = "rtl8723bu" },
>
> /* 8723CS-CG */
> { .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
> @@ -127,7 +133,8 @@ static const struct id_table ic_id_table[] = {
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723cs_cg_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723cs_cg_config" },
> + .cfg_name = "rtl_bt/rtl8723cs_cg_config",
> + .hw_info = "rtl8723cs-cg" },
>
> /* 8723CS-VF */
> { .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
> @@ -138,7 +145,8 @@ static const struct id_table ic_id_table[] = {
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723cs_vf_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723cs_vf_config" },
> + .cfg_name = "rtl_bt/rtl8723cs_vf_config",
> + .hw_info = "rtl8723cs-vf" },
>
> /* 8723CS-XX */
> { .match_flags = IC_MATCH_FL_LMPSUBV | IC_MATCH_FL_CHIP_TYPE |
> @@ -149,28 +157,32 @@ static const struct id_table ic_id_table[] = {
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723cs_xx_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723cs_xx_config" },
> + .cfg_name = "rtl_bt/rtl8723cs_xx_config",
> + .hw_info = "rtl8723cs" },
>
> /* 8723D */
> { IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_USB),
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723d_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723d_config" },
> + .cfg_name = "rtl_bt/rtl8723d_config",
> + .hw_info = "rtl8723du" },
>
> /* 8723DS */
> { IC_INFO(RTL_ROM_LMP_8723B, 0xd, 0x8, HCI_UART),
> .config_needed = true,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8723ds_fw.bin",
> - .cfg_name = "rtl_bt/rtl8723ds_config" },
> + .cfg_name = "rtl_bt/rtl8723ds_config",
> + .hw_info = "rtl8723ds" },
>
> /* 8821A */
> { IC_INFO(RTL_ROM_LMP_8821A, 0xa, 0x6, HCI_USB),
> .config_needed = false,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8821a_fw.bin",
> - .cfg_name = "rtl_bt/rtl8821a_config" },
> + .cfg_name = "rtl_bt/rtl8821a_config",
> + .hw_info = "rtl8821au" },
>
> /* 8821C */
> { IC_INFO(RTL_ROM_LMP_8821A, 0xc, 0x8, HCI_USB),
> @@ -178,7 +190,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8821c_fw.bin",
> - .cfg_name = "rtl_bt/rtl8821c_config" },
> + .cfg_name = "rtl_bt/rtl8821c_config",
> + .hw_info = "rtl8821cu" },
>
> /* 8821CS */
> { IC_INFO(RTL_ROM_LMP_8821A, 0xc, 0x8, HCI_UART),
> @@ -186,14 +199,16 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8821cs_fw.bin",
> - .cfg_name = "rtl_bt/rtl8821cs_config" },
> + .cfg_name = "rtl_bt/rtl8821cs_config",
> + .hw_info = "rtl8821cs" },
>
> /* 8761A */
> { IC_INFO(RTL_ROM_LMP_8761A, 0xa, 0x6, HCI_USB),
> .config_needed = false,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8761a_fw.bin",
> - .cfg_name = "rtl_bt/rtl8761a_config" },
> + .cfg_name = "rtl_bt/rtl8761a_config",
> + .hw_info = "rtl8761au" },
>
> /* 8761B */
> { IC_INFO(RTL_ROM_LMP_8761A, 0xb, 0xa, HCI_UART),
> @@ -201,14 +216,16 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8761b_fw.bin",
> - .cfg_name = "rtl_bt/rtl8761b_config" },
> + .cfg_name = "rtl_bt/rtl8761b_config",
> + .hw_info = "rtl8761btv" },
>
> /* 8761BU */
> { IC_INFO(RTL_ROM_LMP_8761A, 0xb, 0xa, HCI_USB),
> .config_needed = false,
> .has_rom_version = true,
> .fw_name = "rtl_bt/rtl8761bu_fw.bin",
> - .cfg_name = "rtl_bt/rtl8761bu_config" },
> + .cfg_name = "rtl_bt/rtl8761bu_config",
> + .hw_info = "rtl8761bu" },
>
> /* 8822C with UART interface */
> { IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0x8, HCI_UART),
> @@ -216,7 +233,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8822cs_fw.bin",
> - .cfg_name = "rtl_bt/rtl8822cs_config" },
> + .cfg_name = "rtl_bt/rtl8822cs_config",
> + .hw_info = "rtl8822cs" },
>
> /* 8822C with UART interface */
> { IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0xa, HCI_UART),
> @@ -224,7 +242,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8822cs_fw.bin",
> - .cfg_name = "rtl_bt/rtl8822cs_config" },
> + .cfg_name = "rtl_bt/rtl8822cs_config",
> + .hw_info = "rtl8822cs" },
>
> /* 8822C with USB interface */
> { IC_INFO(RTL_ROM_LMP_8822B, 0xc, 0xa, HCI_USB),
> @@ -232,7 +251,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8822cu_fw.bin",
> - .cfg_name = "rtl_bt/rtl8822cu_config" },
> + .cfg_name = "rtl_bt/rtl8822cu_config",
> + .hw_info = "rtl8822cu" },
>
> /* 8822B */
> { IC_INFO(RTL_ROM_LMP_8822B, 0xb, 0x7, HCI_USB),
> @@ -240,7 +260,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8822b_fw.bin",
> - .cfg_name = "rtl_bt/rtl8822b_config" },
> + .cfg_name = "rtl_bt/rtl8822b_config",
> + .hw_info = "rtl8822bu" },
>
> /* 8852A */
> { IC_INFO(RTL_ROM_LMP_8852A, 0xa, 0xb, HCI_USB),
> @@ -248,7 +269,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8852au_fw.bin",
> - .cfg_name = "rtl_bt/rtl8852au_config" },
> + .cfg_name = "rtl_bt/rtl8852au_config",
> + .hw_info = "rtl8852au" },
>
> /* 8852B with UART interface */
> { IC_INFO(RTL_ROM_LMP_8852A, 0xb, 0xb, HCI_UART),
> @@ -256,7 +278,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8852bs_fw.bin",
> - .cfg_name = "rtl_bt/rtl8852bs_config" },
> + .cfg_name = "rtl_bt/rtl8852bs_config",
> + .hw_info = "rtl8852bs" },
>
> /* 8852B */
> { IC_INFO(RTL_ROM_LMP_8852A, 0xb, 0xb, HCI_USB),
> @@ -264,7 +287,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8852bu_fw.bin",
> - .cfg_name = "rtl_bt/rtl8852bu_config" },
> + .cfg_name = "rtl_bt/rtl8852bu_config",
> + .hw_info = "rtl8852bu" },
>
> /* 8852C */
> { IC_INFO(RTL_ROM_LMP_8852A, 0xc, 0xc, HCI_USB),
> @@ -272,7 +296,8 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = true,
> .fw_name = "rtl_bt/rtl8852cu_fw.bin",
> - .cfg_name = "rtl_bt/rtl8852cu_config" },
> + .cfg_name = "rtl_bt/rtl8852cu_config",
> + .hw_info = "rtl8852cu" },
>
> /* 8851B */
> { IC_INFO(RTL_ROM_LMP_8851B, 0xb, 0xc, HCI_USB),
> @@ -280,9 +305,16 @@ static const struct id_table ic_id_table[] = {
> .has_rom_version = true,
> .has_msft_ext = false,
> .fw_name = "rtl_bt/rtl8851bu_fw.bin",
> - .cfg_name = "rtl_bt/rtl8851bu_config" },
> + .cfg_name = "rtl_bt/rtl8851bu_config",
> + .hw_info = "rtl8851bu" },
> };
>
> +static struct {
> + const char *driver_name;
> + char *controller;
> + u32 fw_version;
> +} coredump_info;
> +
> static const struct id_table *btrtl_match_ic(u16 lmp_subver, u16 hci_rev,
> u8 hci_ver, u8 hci_bus,
> u8 chip_type)
> @@ -707,6 +739,7 @@ static int rtlbt_parse_firmware(struct hci_dev *hdev,
> num_patches = le16_to_cpu(epatch_info->num_patches);
> BT_DBG("fw_version=%x, num_patches=%d",
> le32_to_cpu(epatch_info->fw_version), num_patches);
> + coredump_info.fw_version = le32_to_cpu(epatch_info->fw_version);
>
> /* After the rtl_epatch_header there is a funky patch metadata section.
> * Assuming 2 patches, the layout is:
> @@ -903,6 +936,50 @@ static int btrtl_setup_rtl8723b(struct hci_dev *hdev,
> return ret;
> }
>
> +static void btrtl_coredump(struct hci_dev *hdev)
> +{
> + static const u8 param[] = { 0x00, 0x00 };
> +
> + __hci_cmd_send(hdev, RTL_VSC_OP_COREDUMP, sizeof(param), param);
> +}
> +
> +static void btrtl_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> + char buf[80];
> +
> + if (coredump_info.controller)
> + snprintf(buf, sizeof(buf), "Controller Name: %s\n",
> + coredump_info.controller);
> + else
> + snprintf(buf, sizeof(buf), "Controller Name: Unknown\n");
> + skb_put_data(skb, buf, strlen(buf));
> +
> + snprintf(buf, sizeof(buf), "Firmware Version: 0x%X\n",
> + coredump_info.fw_version);
> + skb_put_data(skb, buf, strlen(buf));
> +
> + snprintf(buf, sizeof(buf), "Driver: %s\n", coredump_info.driver_name);
> + skb_put_data(skb, buf, strlen(buf));
> +
> + snprintf(buf, sizeof(buf), "Vendor: Realtek\n");
> + skb_put_data(skb, buf, strlen(buf));
> +}
> +
> +static int btrtl_register_devcoredump_support(struct hci_dev *hdev)
> +{
> + int err;
> +
> + err = hci_devcd_register(hdev, btrtl_coredump, btrtl_dmp_hdr, NULL);
> +
> + return err;
> +}
> +
> +void btrtl_set_driver_name(struct hci_dev *hdev, const char *driver_name)
> +{
> + coredump_info.driver_name = driver_name;
> +}
> +EXPORT_SYMBOL_GPL(btrtl_set_driver_name);
If there are multiple drivers calling the above they will likely
overwrite driver_name.
> +
> static bool rtl_has_chip_type(u16 lmp_subver)
> {
> switch (lmp_subver) {
> @@ -1113,6 +1190,9 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
> if (btrtl_dev->ic_info->has_msft_ext)
> hci_set_msft_opcode(hdev, 0xFCF0);
>
> + if (btrtl_dev->ic_info)
> + coredump_info.controller = btrtl_dev->ic_info->hw_info;
Ditto, coredump_info needs to be stored on a per hdev basis, probably
inside btrtl_device_info.
> +
> return btrtl_dev;
>
> err_free:
> @@ -1125,6 +1205,8 @@ EXPORT_SYMBOL_GPL(btrtl_initialize);
> int btrtl_download_firmware(struct hci_dev *hdev,
> struct btrtl_device_info *btrtl_dev)
> {
> + int err = 0;
> +
> /* Match a set of subver values that correspond to stock firmware,
> * which is not compatible with standard btusb.
> * If matched, upload an alternative firmware that does conform to
> @@ -1133,12 +1215,14 @@ int btrtl_download_firmware(struct hci_dev *hdev,
> */
> if (!btrtl_dev->ic_info) {
> rtl_dev_info(hdev, "assuming no firmware upload needed");
> - return 0;
> + err = 0;
> + goto done;
> }
>
> switch (btrtl_dev->ic_info->lmp_subver) {
> case RTL_ROM_LMP_8723A:
> - return btrtl_setup_rtl8723a(hdev, btrtl_dev);
> + err = btrtl_setup_rtl8723a(hdev, btrtl_dev);
> + break;
> case RTL_ROM_LMP_8723B:
> case RTL_ROM_LMP_8821A:
> case RTL_ROM_LMP_8761A:
> @@ -1146,11 +1230,18 @@ int btrtl_download_firmware(struct hci_dev *hdev,
> case RTL_ROM_LMP_8852A:
> case RTL_ROM_LMP_8703B:
> case RTL_ROM_LMP_8851B:
> - return btrtl_setup_rtl8723b(hdev, btrtl_dev);
> + err = btrtl_setup_rtl8723b(hdev, btrtl_dev);
> + break;
> default:
> rtl_dev_info(hdev, "assuming no firmware upload needed");
> - return 0;
> + break;
> }
> +
> +done:
> + if (!err)
> + err = btrtl_register_devcoredump_support(hdev);
> +
> + return err;
> }
> EXPORT_SYMBOL_GPL(btrtl_download_firmware);
>
> diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h
> index adb4c2c9abc5..fe2888c2d175 100644
> --- a/drivers/bluetooth/btrtl.h
> +++ b/drivers/bluetooth/btrtl.h
> @@ -139,6 +139,7 @@ int btrtl_get_uart_settings(struct hci_dev *hdev,
> struct btrtl_device_info *btrtl_dev,
> unsigned int *controller_baudrate,
> u32 *device_baudrate, bool *flow_control);
> +void btrtl_set_driver_name(struct hci_dev *hdev, const char *driver_name);
>
> #else
>
> @@ -182,4 +183,9 @@ static inline int btrtl_get_uart_settings(struct hci_dev *hdev,
> return -ENOENT;
> }
>
> +static inline void btrtl_set_driver_name(struct hci_dev *hdev, const char *driver_name)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> #endif
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 3aa189b1986d..5fa90347a4e1 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -869,10 +869,49 @@ static void btusb_intel_cmd_timeout(struct hci_dev *hdev)
> gpiod_set_value_cansleep(reset_gpio, 0);
> }
>
> +#define RTK_DEVCOREDUMP_CODE_MEMDUMP 0x01
> +#define RTK_DEVCOREDUMP_CODE_HW_ERR 0x02
> +#define RTK_DEVCOREDUMP_CODE_CMD_TIMEOUT 0x03
> +
> +#define RTK_SUB_EVENT_CODE_COREDUMP 0x34
> +
> +struct rtk_dev_coredump_hdr {
> + u8 type;
> + u8 code;
> + u8 reserved[2];
> +} __packed;
> +
> +static inline void btusb_rtl_alloc_devcoredump(struct hci_dev *hdev,
> + struct rtk_dev_coredump_hdr *hdr, u8 *buf, u32 len)
> +{
> + struct sk_buff *skb;
> +
> + skb = alloc_skb(len + sizeof(*hdr), GFP_ATOMIC);
> + if (!skb)
> + return;
> +
> + skb_put_data(skb, hdr, sizeof(*hdr));
> + if (len)
> + skb_put_data(skb, buf, len);
> +
> + if (!hci_devcd_init(hdev, skb->len)) {
> + hci_devcd_append(hdev, skb);
> + hci_devcd_complete(hdev);
> + } else {
> + bt_dev_err(hdev, "RTL: Failed to generate devcoredump");
> + kfree_skb(skb);
> + }
> +}
> +
> static void btusb_rtl_cmd_timeout(struct hci_dev *hdev)
> {
> struct btusb_data *data = hci_get_drvdata(hdev);
> struct gpio_desc *reset_gpio = data->reset_gpio;
> + struct rtk_dev_coredump_hdr hdr = {
> + .type = RTK_DEVCOREDUMP_CODE_CMD_TIMEOUT,
> + };
> +
> + btusb_rtl_alloc_devcoredump(hdev, &hdr, NULL, 0);
>
> if (++data->cmd_timeout_cnt < 5)
> return;
> @@ -899,6 +938,18 @@ static void btusb_rtl_cmd_timeout(struct hci_dev *hdev)
> gpiod_set_value_cansleep(reset_gpio, 0);
> }
>
> +static void btusb_rtl_hw_error(struct hci_dev *hdev, u8 code)
> +{
> + struct rtk_dev_coredump_hdr hdr = {
> + .type = RTK_DEVCOREDUMP_CODE_HW_ERR,
> + .code = code,
> + };
> +
> + bt_dev_info(hdev, "RTL: hw err, trigger devcoredump");
This probably should be printed as an error with bt_dev_err and print
the code as well.
> + btusb_rtl_alloc_devcoredump(hdev, &hdr, NULL, 0);
> +}
> +
> static void btusb_qca_cmd_timeout(struct hci_dev *hdev)
> {
> struct btusb_data *data = hci_get_drvdata(hdev);
> @@ -2539,6 +2590,25 @@ static int btusb_setup_realtek(struct hci_dev *hdev)
> return ret;
> }
>
> +static int btusb_recv_event_realtek(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> + if (skb->data[0] == HCI_VENDOR_PKT && skb->data[2] == RTK_SUB_EVENT_CODE_COREDUMP) {
> + struct rtk_dev_coredump_hdr hdr = {
> + .code = RTK_DEVCOREDUMP_CODE_MEMDUMP,
> + };
> +
> + bt_dev_info(hdev, "RTL: received coredump vendor evt, len %u",
> + skb->len);
The above should probably be using bt_dev_dbg instead bt_dev_info.
> + btusb_rtl_alloc_devcoredump(hdev, &hdr, skb->data, skb->len);
> + kfree_skb(skb);
> +
> + return 0;
> + }
> +
> + return hci_recv_frame(hdev, skb);
> +}
> +
> /* UHW CR mapping */
> #define MTK_BT_MISC 0x70002510
> #define MTK_BT_SUBSYS_RST 0x70002610
> @@ -3978,6 +4048,8 @@ static int btusb_probe(struct usb_interface *intf,
> } else if (id->driver_info & BTUSB_REALTEK) {
> /* Allocate extra space for Realtek device */
> priv_size += sizeof(struct btrealtek_data);
> +
> + data->recv_event = btusb_recv_event_realtek;
> }
>
> data->recv_acl = hci_recv_frame;
> @@ -4136,9 +4208,11 @@ static int btusb_probe(struct usb_interface *intf,
>
> if (IS_ENABLED(CONFIG_BT_HCIBTUSB_RTL) &&
> (id->driver_info & BTUSB_REALTEK)) {
> + btrtl_set_driver_name(hdev, btusb_driver.name);
> hdev->setup = btusb_setup_realtek;
> hdev->shutdown = btrtl_shutdown_realtek;
> hdev->cmd_timeout = btusb_rtl_cmd_timeout;
> + hdev->hw_error = btusb_rtl_hw_error;
>
> /* Realtek devices need to set remote wakeup on auto-suspend */
> set_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags);
> --
> 2.17.1
>
--
Luiz Augusto von Dentz