mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 10:56:40 +00:00
b4a46996f1
The hci_suspend_notifier which was introduced last year, is causing problems for uart attached btrtl devices. These devices may loose their firmware and their baudrate setting over a suspend/resume. Since we don't even know the baudrate after a suspend/resume recovering from this is tricky. The driver solves this by treating these devices the same as USB BT HCIs which drop of the bus during suspend. Specifically the driver: 1. Simply unconditionally turns the device fully off during system-suspend to save maximum power. 2. Calls device_reprobe() from a workqueue to fully re-init the device from scratch on system-resume (unregistering the old HCI and registering a new HCI). This means that these devices do not benefit from the suspend / resume handling work done by the hci_suspend_notifier. At best this unnecessarily adds some time to the suspend/resume time. But in practice this is actually causing problems: 1. These btrtl devices seem to not like the HCI_OP_WRITE_SCAN_ENABLE( SCAN_DISABLED) request being send to them when entering the BT_SUSPEND_CONFIGURE_WAKE state. The same request send on BT_SUSPEND_DISCONNECT works fine, but the second one send (unnecessarily?) from the BT_SUSPEND_CONFIGURE_WAKE transition causes the device to hang: [ 573.497754] PM: suspend entry (s2idle) [ 573.554615] Filesystems sync: 0.056 seconds [ 575.837753] Bluetooth: hci0: Timed out waiting for suspend events [ 575.837801] Bluetooth: hci0: Suspend timeout bit: 4 [ 575.837925] Bluetooth: hci0: Suspend notifier action (3) failed: -110 2. The PM_POST_SUSPEND / BT_RUNNING transition races with the driver-unbinding done by the device_reprobe() work. If the hci_suspend_notifier wins the race it is talking to a dead device leading to the following errors being logged: [ 598.686060] Bluetooth: hci0: Timed out waiting for suspend events [ 598.686124] Bluetooth: hci0: Suspend timeout bit: 5 [ 598.686237] Bluetooth: hci0: Suspend notifier action (4) failed: -110 In both cases things still work, but the suspend-notifier is causing these ugly errors getting logged and ut increase both the suspend- and the resume-time by 2 seconds. This commit avoids these problems by disabling the hci_suspend_notifier. Cc: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Cc: Vasily Khoruzhick <anarsoul@gmail.com> Cc: Abhishek Pandit-Subedi <abhishekpandit@chromium.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
203 lines
4.8 KiB
C
203 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
*
|
|
* Bluetooth HCI UART driver
|
|
*
|
|
* Copyright (C) 2000-2001 Qualcomm Incorporated
|
|
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
|
|
* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
|
|
*/
|
|
|
|
#ifndef N_HCI
|
|
#define N_HCI 15
|
|
#endif
|
|
|
|
/* Ioctls */
|
|
#define HCIUARTSETPROTO _IOW('U', 200, int)
|
|
#define HCIUARTGETPROTO _IOR('U', 201, int)
|
|
#define HCIUARTGETDEVICE _IOR('U', 202, int)
|
|
#define HCIUARTSETFLAGS _IOW('U', 203, int)
|
|
#define HCIUARTGETFLAGS _IOR('U', 204, int)
|
|
|
|
/* UART protocols */
|
|
#define HCI_UART_MAX_PROTO 12
|
|
|
|
#define HCI_UART_H4 0
|
|
#define HCI_UART_BCSP 1
|
|
#define HCI_UART_3WIRE 2
|
|
#define HCI_UART_H4DS 3
|
|
#define HCI_UART_LL 4
|
|
#define HCI_UART_ATH3K 5
|
|
#define HCI_UART_INTEL 6
|
|
#define HCI_UART_BCM 7
|
|
#define HCI_UART_QCA 8
|
|
#define HCI_UART_AG6XX 9
|
|
#define HCI_UART_NOKIA 10
|
|
#define HCI_UART_MRVL 11
|
|
|
|
#define HCI_UART_RAW_DEVICE 0
|
|
#define HCI_UART_RESET_ON_INIT 1
|
|
#define HCI_UART_CREATE_AMP 2
|
|
#define HCI_UART_INIT_PENDING 3
|
|
#define HCI_UART_EXT_CONFIG 4
|
|
#define HCI_UART_VND_DETECT 5
|
|
|
|
struct hci_uart;
|
|
struct serdev_device;
|
|
|
|
struct hci_uart_proto {
|
|
unsigned int id;
|
|
const char *name;
|
|
unsigned int manufacturer;
|
|
unsigned int init_speed;
|
|
unsigned int oper_speed;
|
|
int (*open)(struct hci_uart *hu);
|
|
int (*close)(struct hci_uart *hu);
|
|
int (*flush)(struct hci_uart *hu);
|
|
int (*setup)(struct hci_uart *hu);
|
|
int (*set_baudrate)(struct hci_uart *hu, unsigned int speed);
|
|
int (*recv)(struct hci_uart *hu, const void *data, int len);
|
|
int (*enqueue)(struct hci_uart *hu, struct sk_buff *skb);
|
|
struct sk_buff *(*dequeue)(struct hci_uart *hu);
|
|
};
|
|
|
|
struct hci_uart {
|
|
struct tty_struct *tty;
|
|
struct serdev_device *serdev;
|
|
struct hci_dev *hdev;
|
|
unsigned long flags;
|
|
unsigned long hdev_flags;
|
|
|
|
struct work_struct init_ready;
|
|
struct work_struct write_work;
|
|
|
|
const struct hci_uart_proto *proto;
|
|
struct percpu_rw_semaphore proto_lock; /* Stop work for proto close */
|
|
void *priv;
|
|
|
|
struct sk_buff *tx_skb;
|
|
unsigned long tx_state;
|
|
|
|
unsigned int init_speed;
|
|
unsigned int oper_speed;
|
|
|
|
u8 alignment;
|
|
u8 padding;
|
|
};
|
|
|
|
/* HCI_UART proto flag bits */
|
|
#define HCI_UART_PROTO_SET 0
|
|
#define HCI_UART_REGISTERED 1
|
|
#define HCI_UART_PROTO_READY 2
|
|
#define HCI_UART_NO_SUSPEND_NOTIFIER 3
|
|
|
|
/* TX states */
|
|
#define HCI_UART_SENDING 1
|
|
#define HCI_UART_TX_WAKEUP 2
|
|
|
|
int hci_uart_register_proto(const struct hci_uart_proto *p);
|
|
int hci_uart_unregister_proto(const struct hci_uart_proto *p);
|
|
int hci_uart_register_device(struct hci_uart *hu, const struct hci_uart_proto *p);
|
|
void hci_uart_unregister_device(struct hci_uart *hu);
|
|
|
|
int hci_uart_tx_wakeup(struct hci_uart *hu);
|
|
int hci_uart_wait_until_sent(struct hci_uart *hu);
|
|
int hci_uart_init_ready(struct hci_uart *hu);
|
|
void hci_uart_init_work(struct work_struct *work);
|
|
void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed);
|
|
bool hci_uart_has_flow_control(struct hci_uart *hu);
|
|
void hci_uart_set_flow_control(struct hci_uart *hu, bool enable);
|
|
void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
|
|
unsigned int oper_speed);
|
|
|
|
#ifdef CONFIG_BT_HCIUART_H4
|
|
int h4_init(void);
|
|
int h4_deinit(void);
|
|
|
|
struct h4_recv_pkt {
|
|
u8 type; /* Packet type */
|
|
u8 hlen; /* Header length */
|
|
u8 loff; /* Data length offset in header */
|
|
u8 lsize; /* Data length field size */
|
|
u16 maxlen; /* Max overall packet length */
|
|
int (*recv)(struct hci_dev *hdev, struct sk_buff *skb);
|
|
};
|
|
|
|
#define H4_RECV_ACL \
|
|
.type = HCI_ACLDATA_PKT, \
|
|
.hlen = HCI_ACL_HDR_SIZE, \
|
|
.loff = 2, \
|
|
.lsize = 2, \
|
|
.maxlen = HCI_MAX_FRAME_SIZE \
|
|
|
|
#define H4_RECV_SCO \
|
|
.type = HCI_SCODATA_PKT, \
|
|
.hlen = HCI_SCO_HDR_SIZE, \
|
|
.loff = 2, \
|
|
.lsize = 1, \
|
|
.maxlen = HCI_MAX_SCO_SIZE
|
|
|
|
#define H4_RECV_EVENT \
|
|
.type = HCI_EVENT_PKT, \
|
|
.hlen = HCI_EVENT_HDR_SIZE, \
|
|
.loff = 1, \
|
|
.lsize = 1, \
|
|
.maxlen = HCI_MAX_EVENT_SIZE
|
|
|
|
#define H4_RECV_ISO \
|
|
.type = HCI_ISODATA_PKT, \
|
|
.hlen = HCI_ISO_HDR_SIZE, \
|
|
.loff = 2, \
|
|
.lsize = 2, \
|
|
.maxlen = HCI_MAX_FRAME_SIZE \
|
|
|
|
struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
|
|
const unsigned char *buffer, int count,
|
|
const struct h4_recv_pkt *pkts, int pkts_count);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_BCSP
|
|
int bcsp_init(void);
|
|
int bcsp_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_LL
|
|
int ll_init(void);
|
|
int ll_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_ATH3K
|
|
int ath_init(void);
|
|
int ath_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_3WIRE
|
|
int h5_init(void);
|
|
int h5_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_INTEL
|
|
int intel_init(void);
|
|
int intel_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_BCM
|
|
int bcm_init(void);
|
|
int bcm_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_QCA
|
|
int qca_init(void);
|
|
int qca_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_AG6XX
|
|
int ag6xx_init(void);
|
|
int ag6xx_deinit(void);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BT_HCIUART_MRVL
|
|
int mrvl_init(void);
|
|
int mrvl_deinit(void);
|
|
#endif
|