marfrit/bes2600-dkms
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bes2600-dkms/bes2600/bes_pwr.h
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test0r 983bd62dd0 bes2600: self-detect when firmware does not honor PSM and skip the cycle 
The c6 series fixed several host-side bookkeeping bugs around PSM
transitions, but didn't address the underlying contract: this chip's
firmware (BES2600 with the Bestechnic Dec 2023 build that ships on
PineTab2 and most danctnix images) silently drops every WSM_set_pm
request without emitting the corresponding PM_INDICATION. The driver's
own power_down_work delayed work calls bes2600_pwr_enter_lp_mode every
~10s; without firmware acknowledgment each call burns 5s on
wait_for_completion_timeout(pm_enter_cmpl, 5*HZ) and produces a
recurring three-line cascade in dmesg:

  bes2600_pwr_enter_lp_mode, wait pm ind timeout
  bes2600_sdio_active failed, subsys:0
  bes2600_pwr_device_exit_lp_mode, active mcu fail

Confirmed by tripwire instrumentation on PineTab2 (linux-pinetab2
6.19.10-danctnix1, ohm) running the c5+c6 stack: zero
wsm_set_pm_indication() invocations across an entire boot, while
bes2600_pwr_enter_lp_mode timed out repeatedly, and
bes2600_sdio_active() consistently saw BES_SLAVE_STATUS_REG_ID return
0x2f (every "ready" bit set except MCU_WAKEUP_READY (bit 4) - the
firmware reports "I'm awake, there's nothing to wake from").

This patch makes the driver self-heal:

  * struct bes2600_pwr_t gains pm_unsupported (bool) and
    pm_consecutive_timeouts (unsigned int). Both initialised to
    0/false.

  * bes2600_pwr_enter_lp_mode early-returns -EOPNOTSUPP when
    pm_unsupported is set. Skips the per-VIF set_pm round-trip and
    the wait_for_completion entirely.

  * On the cmpxchg-success branch of the timeout path, we increment
    pm_consecutive_timeouts. When it crosses
    BES2600_PM_UNSUPPORTED_THRESHOLD (3, ~15s of trying), we latch
    pm_unsupported = true and force chip_pm_state = ACTIVE so that
    bes2600_pwr_device_exit_lp_mode's c6.2 skip branch covers the
    wake side (no gpio_wake / sbus_active / WSM_set_operational_mode
    reissue past the first one).

  * bes2600_pwr_notify_ps_changed resets pm_consecutive_timeouts to 0
    on any incoming PM indication, and clears pm_unsupported if it
    was previously latched. So a firmware update that fixes PM_IND
    delivery automatically re-enables PSM transitions without a
    driver rebuild.

mac80211's PSM requests via bes2600_set_pm() still flow to the
firmware unchanged; they just don't have host-side timeouts so they
remain silent regardless of firmware acknowledgment. Power
consumption goes up if the firmware actually CAN do PSM (we'd be
keeping the chip awake unnecessarily), but on a chip where the
counter trips this trade-off is forced anyway: the chip stayed awake
under the broken cascade as well, just with constant SDIO churn.

Net effect on dmesg: after ~15s of boot, the three-line cascade stops
firing entirely. The firmware-side wedge is observed once per boot
(captured by the pm_unsupported latch) instead of per-cycle.

Signed-off-by: Markus Fritsche <fritsche.markus@gmail.com>
2026-04-28 19:51:17 +02:00

193 lines
8.6 KiB
C
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/*
* Mac80211 driver for BES2600 device
*
* Copyright (c) 2022, Bestechnic
* Author:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __BES_PWR_H__
#define __BES_PWR_H__
#include "bes2600.h"
enum bes2600_pwr_event_type {
BES_PWR_LOCK_ON_SCAN = 1,
BES_PWR_LOCK_ON_JOIN,
BES_PWR_LOCK_ON_TX,
BES_PWR_LOCK_ON_RX,
BES_PWR_LOCK_ON_FLUSH,
BES_PWR_LOCK_ON_ROC,
BES_PWR_LOCK_ON_WSM_TX,
BES_PWR_LOCK_ON_WSM_OPER,
BES_PWR_LOCK_ON_BSS_LOST,
BES_PWR_LOCK_ON_GET_IP,
BES_PWR_LOCK_ON_PS_ACTIVE,
BES_PWR_LOCK_ON_LMAC_RSP,
BES_PWR_LOCK_ON_AP,
BES_PWR_LOCK_ON_TEST_CMD,
BES_PWR_LOCK_ON_MUL_REQ,
BES_PWR_LOCK_ON_ADV_SCAN,
BES_PWR_LOCK_ON_DISCON,
BES_PWR_LOCK_ON_QUEUE_GC,
BES_PWR_LOCK_ON_AP_LP_BAD,
/* add new lock event here */
BES_PWR_LOCK_ON_EVENT_MAX,
};
#define BES_PWR_IS_CONSTANT_EVENT(x) ((x) & 0x80000000)
#define BES_PWR_EVENT_SET_CONSTANT(x) (x = (x | 0x80000000))
#define BES_PWR_EVENT_NUMBER(x) ((x) & 0x7fffffff)
#define BES2600_POWER_DOWN_DELAY 50 // unit in millisecond
#define BES2600_DELAY_EVENT_NUM (BES_PWR_LOCK_ON_EVENT_MAX << 1)
#define BES_PWR_EVENT_TX_TIMEOUT 1500 // unit in millisecond
#define BES_PWR_EVENT_RX_TIMEOUT 100 // unit in millisecond
struct bes2600_pwr_event_t
{
struct list_head link;
unsigned long timeout;
unsigned long delay;
u8 idx;
enum bes2600_pwr_event_type event;
};
enum power_down_state
{
POWER_DOWN_STATE_LOCKED = 0,
POWER_DOWN_STATE_LOCKING,
POWER_DOWN_STATE_UNLOCKING,
POWER_DOWN_STATE_UNLOCKED,
};
/*
* Confirmed PM state of the firmware-side chip. Tracks what the host
* has *seen* the firmware acknowledge, not what the host has
* requested. UNKNOWN means a host-initiated transition timed out
* before the firmware indication arrived; the next wake path should
* treat it as "we don't know" and probe before issuing GPIO/SDIO
* wakeup ops.
*/
enum bes2600_chip_pm_state {
BES2600_CHIP_PM_ACTIVE = 0,
BES2600_CHIP_PM_LP,
BES2600_CHIP_PM_UNKNOWN,
};
typedef void (*bes_pwr_enter_lp_cb)(struct bes2600_common *hw_priv);
typedef void (*bes_pwr_exit_lp_cb)(struct bes2600_common *hw_priv);
struct bes2600_pwr_enter_cb_item
{
struct list_head link;
bes_pwr_enter_lp_cb cb;
};
struct bes2600_pwr_exit_cb_item
{
struct list_head link;
bes_pwr_exit_lp_cb cb;
};
struct bes2600_pwr_t
{
spinlock_t pwr_lock;
struct delayed_work power_down_work;
struct work_struct power_async_work;
struct work_struct power_mcu_down_work;
struct list_head async_timeout_list;
struct list_head pending_event_list;
struct list_head free_event_list;
enum power_down_state power_state;
struct task_struct *power_down_task;
struct task_struct *power_up_task;
struct task_struct *sys_suspend_task;
struct task_struct *sys_resume_task;
struct semaphore sync_lock;
bool pending_lock;
atomic_t dev_state;
struct mutex pwr_mutex;
struct bes2600_common *hw_priv;
struct completion pm_enter_cmpl;
struct mutex pwr_cb_mutex;
struct list_head enter_cb_list;
struct list_head exit_cb_list;
wait_queue_head_t dev_lp_wq;
bool ap_lp_bad;
struct bes2600_pwr_event_t pwr_events[BES2600_DELAY_EVENT_NUM];
atomic_t pm_set_in_process;
atomic_t chip_pm_state;
/*
* Sticky flag set after BES2600_PM_UNSUPPORTED_THRESHOLD
* consecutive enter_lp_mode timeouts with zero PM_INDICATIONs
* received from firmware. Indicates this chip's firmware does
* not honor host-driven PSM transitions; further attempts are
* skipped to avoid the 5s timeout cascade.
*/
bool pm_unsupported;
unsigned int pm_consecutive_timeouts;
};
#ifdef CONFIG_BES2600_WOWLAN
void bes2600_pwr_init(struct bes2600_common *hw_priv);
void bes2600_pwr_exit(struct bes2600_common *hw_priv);
void bes2600_pwr_prepare(struct bes2600_common *hw_priv);
void bes2600_pwr_complete(struct bes2600_common *hw_priv);
void bes2600_pwr_start(struct bes2600_common *hw_priv);
void bes2600_pwr_stop(struct bes2600_common *hw_priv);
bool bes2600_pwr_constant_event_is_pending(struct bes2600_common *hw_priv, u32 event);
int bes2600_pwr_set_busy_event(struct bes2600_common *hw_priv, u32 event);
int bes2600_pwr_set_busy_event_async(struct bes2600_common *hw_priv, u32 event);
int bes2600_pwr_set_busy_event_with_timeout(struct bes2600_common *hw_priv, u32 event, u32 timeout);
int bes2600_pwr_set_busy_event_with_timeout_async(struct bes2600_common *hw_priv, u32 event, u32 timeout);
int bes2600_pwr_clear_busy_event(struct bes2600_common *hw_priv, u32 event);
void bes2600_pwr_notify_ps_changed(struct bes2600_common *hw_priv, u8 psmode);
bool bes2600_pwr_device_is_idle(struct bes2600_common *hw_priv);
void bes2600_pwr_register_en_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb);
void bes2600_pwr_unregister_en_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb);
void bes2600_pwr_register_exit_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb);
void bes2600_pwr_unregister_exit_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb);
void bes2600_pwr_suspend_start(struct bes2600_common *hw_priv);
void bes2600_pwr_suspend_end(struct bes2600_common *hw_priv);
void bes2600_pwr_resume_start(struct bes2600_common *hw_priv);
void bes2600_pwr_resume_end(struct bes2600_common *hw_priv);
void bes2600_pwr_mcu_sleep_directly(struct bes2600_common *hw_priv);
void bes2600_pwr_mark_ap_lp_bad(struct bes2600_common *hw_priv);
void bes2600_pwr_clear_ap_lp_bad_mark(struct bes2600_common *hw_priv);
int bes2600_pwr_busy_event_dump(struct bes2600_common *hw_priv, char *buffer, u32 buf_len);
int bes2600_pwr_busy_event_record(struct bes2600_common *hw_priv, char *buffer, u32 buf_len);
#else
static inline void bes2600_pwr_init(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_exit(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_prepare(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_complete(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_start(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_stop(struct bes2600_common *hw_priv) { }
static inline bool bes2600_pwr_constant_event_is_pending(struct bes2600_common *hw_priv, u32 event) { return false; }
static inline int bes2600_pwr_set_busy_event(struct bes2600_common *hw_priv, u32 event) { return 0; }
static inline int bes2600_pwr_set_busy_event_async(struct bes2600_common *hw_priv, u32 event) {return 0; }
static inline int bes2600_pwr_set_busy_event_with_timeout(struct bes2600_common *hw_priv, u32 event, u32 timeout) { return 0; }
static inline int bes2600_pwr_set_busy_event_with_timeout_async(struct bes2600_common *hw_priv, u32 event, u32 timeout) { return 0; }
static inline int bes2600_pwr_clear_busy_event(struct bes2600_common *hw_priv, u32 event) { return 0; }
static inline void bes2600_pwr_notify_ps_changed(struct bes2600_common *hw_priv, u8 psmode) { }
static inline bool bes2600_pwr_device_is_idle(struct bes2600_common *hw_priv) { return false; }
static inline void bes2600_pwr_register_en_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb) { }
static inline void bes2600_pwr_unregister_en_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb) { }
static inline void bes2600_pwr_register_exit_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb) { }
static inline void bes2600_pwr_unregister_exit_lp_cb(struct bes2600_common *hw_priv, bes_pwr_enter_lp_cb cb) { }
static inline void bes2600_pwr_suspend_start(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_suspend_end(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_resume_start(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_resume_end(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_mcu_sleep_directly(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_mark_ap_lp_bad(struct bes2600_common *hw_priv) { }
static inline void bes2600_pwr_clear_ap_lp_bad_mark(struct bes2600_common *hw_priv) { }
static inline int bes2600_pwr_busy_event_dump(struct bes2600_common *hw_priv, char *buffer, u32 buf_len) { return 0; }
static inline int bes2600_pwr_busy_event_record(struct bes2600_common *hw_priv, char *buffer, u32 buf_len) { return 0; }
#endif
#endif
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