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patches: add c7 self-detect firmware doesn't honor PSM

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Markus Fritsche
2026-04-28 16:56:15 +02:00
parent 71d9d5f8c4
commit 670ee57432
2 changed files with 364 additions and 0 deletions
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patches/pm-detect-firmware-unsupported/0001-bes2600-self-detect-when-firmware-does-not-honor-PSM.patch
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@@ -0,0 +1,182 @@
From a91de9e6cadb00315e06cfde292d600bacc35020 Mon Sep 17 00:00:00 2001
From: Markus Fritsche <fritsche.markus@gmail.com>
Date: Tue, 28 Apr 2026 16:54:06 +0200
Subject: [PATCH] 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>
---
bes2600/bes_pwr.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
bes2600/bes_pwr.h | 9 +++++++++
2 files changed, 59 insertions(+)
diff --git a/bes2600/bes_pwr.c b/bes2600/bes_pwr.c
index b7b6c2f..8f46a83 100644
--- a/bes2600/bes_pwr.c
+++ b/bes2600/bes_pwr.c
@@ -467,6 +467,28 @@ static void bes2600_pwr_device_enter_lp_mode(struct bes2600_common *hw_priv)
bes_devel("device enter sleep\n");
}
+/*
+ * Number of consecutive bes2600_pwr_enter_lp_mode timeouts (with zero
+ * PM_INDICATIONs received) before we conclude the firmware does not
+ * honor host-driven PSM and switch to a sticky skip path.
+ */
+#define BES2600_PM_UNSUPPORTED_THRESHOLD 3
+
+/*
+ * Latch pm_unsupported = true and force chip_pm_state = ACTIVE so the
+ * c6.2 wake-side skip branch covers bes2600_pwr_device_exit_lp_mode.
+ * Called after BES2600_PM_UNSUPPORTED_THRESHOLD consecutive enter_lp_mode
+ * timeouts with zero PM_INDICATIONs.
+ */
+static void bes2600_pwr_latch_pm_unsupported(struct bes2600_common *hw_priv)
+{
+ bes_warn("PSM not honored (%u timeouts), switching to skip mode\n",
+ hw_priv->bes_power.pm_consecutive_timeouts);
+ hw_priv->bes_power.pm_unsupported = true;
+ atomic_set(&hw_priv->bes_power.chip_pm_state,
+ BES2600_CHIP_PM_ACTIVE);
+}
+
static int bes2600_pwr_enter_lp_mode(struct bes2600_common *hw_priv)
{
int i = 0;
@@ -476,6 +498,17 @@ static int bes2600_pwr_enter_lp_mode(struct bes2600_common *hw_priv)
char ip_str[20];
unsigned long status = 0;
+ /*
+ * Sticky early-return when we've previously concluded the firmware
+ * doesn't honor PSM. Each attempt would otherwise burn 5s on a
+ * doomed wait_for_completion_timeout and produce a noisy three-line
+ * cascade in dmesg every time power_down_work retries (every
+ * ~10s). The chip stays in active mode, which on this firmware is
+ * the de-facto state anyway.
+ */
+ if (hw_priv->bes_power.pm_unsupported)
+ return -EOPNOTSUPP;
+
/* set interface low power configuration */
bes2600_for_each_vif(hw_priv, priv, i) {
#ifdef P2P_MULTIVIF
@@ -571,6 +604,9 @@ static int bes2600_pwr_enter_lp_mode(struct bes2600_common *hw_priv)
atomic_set(&hw_priv->bes_power.chip_pm_state,
BES2600_CHIP_PM_UNKNOWN);
timeouts++;
+ if (++hw_priv->bes_power.pm_consecutive_timeouts
+ >= BES2600_PM_UNSUPPORTED_THRESHOLD)
+ bes2600_pwr_latch_pm_unsupported(hw_priv);
}
}
} else {
@@ -932,6 +968,8 @@ void bes2600_pwr_init(struct bes2600_common *hw_priv)
mutex_init(&hw_priv->bes_power.pwr_mutex);
atomic_set(&hw_priv->bes_power.dev_state, 0);
atomic_set(&hw_priv->bes_power.chip_pm_state, BES2600_CHIP_PM_UNKNOWN);
+ hw_priv->bes_power.pm_unsupported = false;
+ hw_priv->bes_power.pm_consecutive_timeouts = 0;
init_completion(&hw_priv->bes_power.pm_enter_cmpl);
sema_init(&hw_priv->bes_power.sync_lock, 1);
device_set_wakeup_capable(hw_priv->pdev, true);
@@ -1321,6 +1359,18 @@ void bes2600_pwr_notify_ps_changed(struct bes2600_common *hw_priv, u8 psmode)
* indication can prime a future wait against a freshly
* reinit_completion()'ed state.
*/
+ /*
+ * Any PM indication, whatever its psmode, proves the firmware is
+ * actually emitting them. Reset the consecutive-timeout counter
+ * so a transient stall doesn't permanently disable PSM, and clear
+ * pm_unsupported if a previous run had latched it.
+ */
+ hw_priv->bes_power.pm_consecutive_timeouts = 0;
+ if (hw_priv->bes_power.pm_unsupported) {
+ bes_warn("PM indication arrived after pm_unsupported was set; re-enabling PSM transitions\n");
+ hw_priv->bes_power.pm_unsupported = false;
+ }
+
if ((psmode & 0x01) != WSM_PSM_ACTIVE) {
atomic_set(&hw_priv->bes_power.chip_pm_state,
BES2600_CHIP_PM_LP);
diff --git a/bes2600/bes_pwr.h b/bes2600/bes_pwr.h
index 6bc44ac..92de90b 100644
--- a/bes2600/bes_pwr.h
+++ b/bes2600/bes_pwr.h
@@ -121,6 +121,15 @@ struct bes2600_pwr_t
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
--
2.53.0