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linux-dey-6.6: update RT patches to v6.6-stm32mp-r3 Linux release 

Sync STM32MP-specific RT kernel patches, aligned with the latest
ST release from meta-st-x-linux-rt layer.

Signed-off-by: Mike Engel <Mike.Engel@digi.com>
This commit is contained in:
Mike Engel 2026-05-12 16:56:08 +02:00
parent 58577373ba
commit bcf4883d60
4 changed files with 610 additions and 869 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

639
meta-digi-arm/recipes-kernel/linux/linux-dey/stm32mpcommon/0010-Rebase-on-v6.6.78-rt51.patch → meta-digi-arm/recipes-kernel/linux/linux-dey/stm32mpcommon/0010-Rebase-on-v6.6.116-rt66.patch
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File diff suppressed because it is too large Load Diff

515
meta-digi-arm/recipes-kernel/linux/linux-dey/stm32mpcommon/0011-v6.6-stm32mp-rt-r2.patch
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@ -1,515 +0,0 @@
From 57e65e96ba3f5350f7ec305a8ea4318b2c6d88b9 Mon Sep 17 00:00:00 2001
From: Christophe Priouzeau <christophe.priouzeau@foss.st.com>
Date: Thu, 5 Jun 2025 11:10:31 +0200
Subject: [PATCH] v6.6-stm32mp-rt-r2
---
Upstream-Status: Pending [specific to ST boards]
.../configs/fragment-07-rt-sysvinit.config | 12 ++++
arch/arm/configs/fragment-07-rt.config | 9 +++
arch/arm/configs/fragment-10-rt-perf.config | 40 +++++++++++++
.../configs/fragment-07-rt-sysvinit.config | 12 ++++
arch/arm64/configs/fragment-07-rt.config | 9 +++
arch/arm64/configs/fragment-10-rt-perf.config | 40 +++++++++++++
drivers/clocksource/timer-stm32-lp.c | 36 +++++++++++-
drivers/hwtracing/coresight/coresight-cti.h | 10 ++++
drivers/input/keyboard/gpio_keys.c | 7 ++-
drivers/mfd/syscon.c | 3 +
drivers/tty/serial/stm32-usart.c | 56 +++++--------------
11 files changed, 188 insertions(+), 46 deletions(-)
create mode 100644 arch/arm/configs/fragment-07-rt-sysvinit.config
create mode 100644 arch/arm/configs/fragment-07-rt.config
create mode 100644 arch/arm/configs/fragment-10-rt-perf.config
create mode 100644 arch/arm64/configs/fragment-07-rt-sysvinit.config
create mode 100644 arch/arm64/configs/fragment-07-rt.config
create mode 100644 arch/arm64/configs/fragment-10-rt-perf.config
diff --git a/arch/arm/configs/fragment-07-rt-sysvinit.config b/arch/arm/configs/fragment-07-rt-sysvinit.config
new file mode 100644
index 000000000..49a4baf60
--- /dev/null
+++ b/arch/arm/configs/fragment-07-rt-sysvinit.config
@@ -0,0 +1,12 @@
+CONFIG_CGROUPS=y
+# CONFIG_CGROUP_SCHED is not set
+# CONFIG_CGROUP_PIDS is not set
+# CONFIG_CGROUP_RDMA is not set
+# CONFIG_CGROUP_FREEZER is not set
+# CONFIG_CGROUP_DEVICE is not set
+# CONFIG_CGROUP_CPUACCT is not set
+# CONFIG_CGROUP_PERF is not set
+# CONFIG_CGROUP_DEBUG is not set
+# CONFIG_CGROUP_NET_PRIO is not set
+# CONFIG_CGROUP_NET_CLASSID is not set
+
diff --git a/arch/arm/configs/fragment-07-rt.config b/arch/arm/configs/fragment-07-rt.config
new file mode 100644
index 000000000..aba9d8c25
--- /dev/null
+++ b/arch/arm/configs/fragment-07-rt.config
@@ -0,0 +1,9 @@
+CONFIG_EXPERT=y
+CONFIG_PREEMPT_RT=y
+
+# Force to have HIGH_RES_TIMERS
+CONFIG_HIGH_RES_TIMERS=y
+
+# Disable CPUFREQ and CPUIDLE
+# CONFIG_CPU_FREQ is not set
+# CONFIG_CPU_IDLE is not set
diff --git a/arch/arm/configs/fragment-10-rt-perf.config b/arch/arm/configs/fragment-10-rt-perf.config
new file mode 100644
index 000000000..46e67dba9
--- /dev/null
+++ b/arch/arm/configs/fragment-10-rt-perf.config
@@ -0,0 +1,40 @@
+# avoid degrading from-idle transition latencies, disable dyntick
+CONFIG_HZ_PERIODIC=y
+
+# Disable OPTEE RNG over PTA support
+# CONFIG_HW_RANDOM_OPTEE is not set
+
+# Remove power domains management
+# CONFIG_SUSPEND_FREEZER is not set
+# CONFIG_HIBERNATE_CALLBACKS is not set
+# CONFIG_PM_SLEEP is not set
+# CONFIG_PM_TRACE_RTC is not set
+# CONFIG_PM_GENERIC_DOMAINS is not set
+
+#Debugging features
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_PROFILING is not set
+# CONFIG_PSI is not set
+# to Enable ftrace, you need to enable the following configuration:
+# CONFIG_TRACING is not set
+# CONFIG_FTRACE is not set
+# CONFIG_IRQSOFF_TRACER is not set
+# CONFIG_PREEMPT_TRACER is not set
+# CONFIG_SCHED_TRACER is not set
+# CONFIG_FUNCTION_TRACER is not set
+# CONFIG_FTRACE_SYSCALLS is not set
+# CONFIG_STACK_TRACER is not set
+# CONFIG_FUNCTION_PROFILER is not set
+# CONFIG_TIMERLAT_TRACER is not set
+
+#Lockdep activation
+# CONFIG_DEBUG_ATOMIC_SLEEP is not set
+# CONFIG_DEBUG_LOCK_ALLOC is not set
+# CONFIG_DEBUG_MUTEXES is not set
+# CONFIG_DEBUG_SPINLOCK is not set
+# CONFIG_LOCKDEP is not set
+# CONFIG_LOCKUP_DETECTOR is not set
+# CONFIG_PROVE_LOCKING is not set
+# CONFIG_SLUB_DEBUG_ON is not set
+
+# CONFIG_ARM_SMC_WATCHDOG is not set
diff --git a/arch/arm64/configs/fragment-07-rt-sysvinit.config b/arch/arm64/configs/fragment-07-rt-sysvinit.config
new file mode 100644
index 000000000..49a4baf60
--- /dev/null
+++ b/arch/arm64/configs/fragment-07-rt-sysvinit.config
@@ -0,0 +1,12 @@
+CONFIG_CGROUPS=y
+# CONFIG_CGROUP_SCHED is not set
+# CONFIG_CGROUP_PIDS is not set
+# CONFIG_CGROUP_RDMA is not set
+# CONFIG_CGROUP_FREEZER is not set
+# CONFIG_CGROUP_DEVICE is not set
+# CONFIG_CGROUP_CPUACCT is not set
+# CONFIG_CGROUP_PERF is not set
+# CONFIG_CGROUP_DEBUG is not set
+# CONFIG_CGROUP_NET_PRIO is not set
+# CONFIG_CGROUP_NET_CLASSID is not set
+
diff --git a/arch/arm64/configs/fragment-07-rt.config b/arch/arm64/configs/fragment-07-rt.config
new file mode 100644
index 000000000..aba9d8c25
--- /dev/null
+++ b/arch/arm64/configs/fragment-07-rt.config
@@ -0,0 +1,9 @@
+CONFIG_EXPERT=y
+CONFIG_PREEMPT_RT=y
+
+# Force to have HIGH_RES_TIMERS
+CONFIG_HIGH_RES_TIMERS=y
+
+# Disable CPUFREQ and CPUIDLE
+# CONFIG_CPU_FREQ is not set
+# CONFIG_CPU_IDLE is not set
diff --git a/arch/arm64/configs/fragment-10-rt-perf.config b/arch/arm64/configs/fragment-10-rt-perf.config
new file mode 100644
index 000000000..46e67dba9
--- /dev/null
+++ b/arch/arm64/configs/fragment-10-rt-perf.config
@@ -0,0 +1,40 @@
+# avoid degrading from-idle transition latencies, disable dyntick
+CONFIG_HZ_PERIODIC=y
+
+# Disable OPTEE RNG over PTA support
+# CONFIG_HW_RANDOM_OPTEE is not set
+
+# Remove power domains management
+# CONFIG_SUSPEND_FREEZER is not set
+# CONFIG_HIBERNATE_CALLBACKS is not set
+# CONFIG_PM_SLEEP is not set
+# CONFIG_PM_TRACE_RTC is not set
+# CONFIG_PM_GENERIC_DOMAINS is not set
+
+#Debugging features
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_PROFILING is not set
+# CONFIG_PSI is not set
+# to Enable ftrace, you need to enable the following configuration:
+# CONFIG_TRACING is not set
+# CONFIG_FTRACE is not set
+# CONFIG_IRQSOFF_TRACER is not set
+# CONFIG_PREEMPT_TRACER is not set
+# CONFIG_SCHED_TRACER is not set
+# CONFIG_FUNCTION_TRACER is not set
+# CONFIG_FTRACE_SYSCALLS is not set
+# CONFIG_STACK_TRACER is not set
+# CONFIG_FUNCTION_PROFILER is not set
+# CONFIG_TIMERLAT_TRACER is not set
+
+#Lockdep activation
+# CONFIG_DEBUG_ATOMIC_SLEEP is not set
+# CONFIG_DEBUG_LOCK_ALLOC is not set
+# CONFIG_DEBUG_MUTEXES is not set
+# CONFIG_DEBUG_SPINLOCK is not set
+# CONFIG_LOCKDEP is not set
+# CONFIG_LOCKUP_DETECTOR is not set
+# CONFIG_PROVE_LOCKING is not set
+# CONFIG_SLUB_DEBUG_ON is not set
+
+# CONFIG_ARM_SMC_WATCHDOG is not set
diff --git a/drivers/clocksource/timer-stm32-lp.c b/drivers/clocksource/timer-stm32-lp.c
index 815abee7c..4191d38c3 100644
--- a/drivers/clocksource/timer-stm32-lp.c
+++ b/drivers/clocksource/timer-stm32-lp.c
@@ -43,7 +43,8 @@ static int stm32_clkevent_lp_shutdown(struct clock_event_device *clkevt)
struct stm32_lp_private *priv = to_priv(clkevt);
int ret;
- if (clockevent_state_oneshot(clkevt) || clockevent_state_periodic(clkevt)) {
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) &&
+ (clockevent_state_oneshot(clkevt) || clockevent_state_periodic(clkevt))) {
ret = pm_runtime_put(priv->dev);
if (ret < 0) {
dev_err(priv->dev, "pm runtime get returned %d\n", ret);
@@ -147,6 +148,13 @@ static int stm32_clkevent_lp_pm_runtime_get(struct clock_event_device *clkevt)
struct stm32_lp_private *priv = to_priv(clkevt);
int ret;
+ /*
+ * When in PREEMPT_RT, pm_runtime acquires a spinlock, that's not allowed in
+ * atomic context. Workaround it by enabling runtime PM upon probe.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return 0;
+
/* Rely on old clockevent state, to balance pm_runtime_get() / pm_runtime_put() calls */
if (clockevent_state_detached(clkevt) || clockevent_state_shutdown(clkevt)) {
ret = pm_runtime_get(priv->dev);
@@ -160,6 +168,17 @@ static int stm32_clkevent_lp_pm_runtime_get(struct clock_event_device *clkevt)
return 0;
}
+static void stm32_clkevent_lp_pm_runtime_err(struct clock_event_device *clkevt)
+{
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return;
+
+ if (clockevent_state_detached(clkevt) || clockevent_state_shutdown(clkevt))
+ pm_runtime_put(priv->dev);
+}
+
static int stm32_clkevent_lp_set_periodic(struct clock_event_device *clkevt)
{
struct stm32_lp_private *priv = to_priv(clkevt);
@@ -171,7 +190,7 @@ static int stm32_clkevent_lp_set_periodic(struct clock_event_device *clkevt)
ret = stm32_clkevent_lp_set_timer(priv->period, clkevt, true);
if (ret < 0)
- pm_runtime_put(priv->dev);
+ stm32_clkevent_lp_pm_runtime_err(clkevt);
return ret;
}
@@ -187,7 +206,7 @@ static int stm32_clkevent_lp_set_oneshot(struct clock_event_device *clkevt)
ret = stm32_clkevent_lp_set_timer(priv->period, clkevt, false);
if (ret < 0)
- pm_runtime_put(priv->dev);
+ stm32_clkevent_lp_pm_runtime_err(clkevt);
return ret;
}
@@ -311,6 +330,17 @@ static int stm32_clkevent_lp_probe(struct platform_device *pdev)
if (ret)
return ret;
+ /*
+ * When in PREEMPT_RT, pm_runtime acquires a spinlock, that's not allowed in atomic
+ * context. Runtime PM is used to acquire the parent's PM domain, when there's one.
+ * That's not necessarily the case on all instances, so it seems an acceptable trade-off.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret)
+ return ret;
+ }
+
priv->dev = &pdev->dev;
stm32_clkevent_lp_init(priv, pdev->dev.parent->of_node, rate);
diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
index cb9ee616d..9f9eaaf29 100644
--- a/drivers/hwtracing/coresight/coresight-cti.h
+++ b/drivers/hwtracing/coresight/coresight-cti.h
@@ -17,6 +17,16 @@
#include "coresight-priv.h"
+#ifdef CONFIG_PREEMPT_RT
+#undef spin_lock_init
+#define spin_lock_init raw_spin_lock_init
+#define spin_lock raw_spin_lock
+#define spin_unlock raw_spin_unlock
+#undef spin_lock_irqsave
+#define spin_lock_irqsave raw_spin_lock_irqsave
+#define spin_unlock_irqrestore raw_spin_unlock_irqrestore
+#define spinlock_t raw_spinlock_t
+#endif
/*
* Device registers
* 0x000 - 0x144: CTI programming and status
diff --git a/drivers/input/keyboard/gpio_keys.c b/drivers/input/keyboard/gpio_keys.c
index 2e7c2c046..b96a85460 100644
--- a/drivers/input/keyboard/gpio_keys.c
+++ b/drivers/input/keyboard/gpio_keys.c
@@ -454,12 +454,15 @@ static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t)
struct gpio_button_data,
release_timer);
struct input_dev *input = bdata->input;
+ unsigned long flags;
+ spin_lock_irqsave(&bdata->lock, flags);
if (bdata->key_pressed) {
input_report_key(input, *bdata->code, 0);
input_sync(input);
bdata->key_pressed = false;
}
+ spin_unlock_irqrestore(&bdata->lock, flags);
return HRTIMER_NORESTART;
}
@@ -493,7 +496,7 @@ static irqreturn_t gpio_keys_irq_isr(int irq, void *dev_id)
if (bdata->release_delay)
hrtimer_start(&bdata->release_timer,
ms_to_ktime(bdata->release_delay),
- HRTIMER_MODE_REL_HARD);
+ HRTIMER_MODE_REL);
out:
spin_unlock_irqrestore(&bdata->lock, flags);
return IRQ_HANDLED;
@@ -630,7 +633,7 @@ static int gpio_keys_setup_key(struct platform_device *pdev,
bdata->release_delay = button->debounce_interval;
hrtimer_init(&bdata->release_timer,
- CLOCK_REALTIME, HRTIMER_MODE_REL_HARD);
+ CLOCK_REALTIME, HRTIMER_MODE_REL);
bdata->release_timer.function = gpio_keys_irq_timer;
isr = gpio_keys_irq_isr;
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 729e79e1b..233712c70 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -42,6 +42,9 @@ static const struct regmap_config syscon_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
+#ifdef CONFIG_PREEMPT_RT
+ .use_raw_spinlock = true,
+#endif
};
static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 1c949774f..b56d3b77c 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -58,7 +58,6 @@ static struct stm32_usart_info __maybe_unused stm32f4_info = {
.cfg = {
.uart_enable_bit = 13,
.has_7bits_data = false,
- .fifosize = 1,
}
};
@@ -82,7 +81,6 @@ static struct stm32_usart_info __maybe_unused stm32f7_info = {
.uart_enable_bit = 0,
.has_7bits_data = true,
.has_swap = true,
- .fifosize = 1,
}
};
@@ -109,7 +107,6 @@ static struct stm32_usart_info __maybe_unused stm32h7_info = {
.has_swap = true,
.has_wakeup = true,
.has_fifo = true,
- .fifosize = 16,
}
};
@@ -192,7 +189,6 @@ static void stm32_usart_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
u32 delay_DDE, u32 baud)
{
u32 rs485_deat_dedt;
- u32 rs485_deat_dedt_max = (USART_CR1_DEAT_MASK >> USART_CR1_DEAT_SHIFT);
bool over8;
*cr3 |= USART_CR3_DEM;
@@ -205,24 +201,18 @@ static void stm32_usart_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
else
rs485_deat_dedt = delay_ADE * baud * 16;
- rs485_deat_dedt = DIV_ROUND_CLOSEST(rs485_deat_dedt, 1000);
- rs485_deat_dedt = rs485_deat_dedt > rs485_deat_dedt_max ?
- rs485_deat_dedt_max : rs485_deat_dedt;
- rs485_deat_dedt = (rs485_deat_dedt << USART_CR1_DEAT_SHIFT) &
- USART_CR1_DEAT_MASK;
- *cr1 |= rs485_deat_dedt;
+ rs485_deat_dedt = DIV_ROUND_UP(rs485_deat_dedt, 1000);
+ rs485_deat_dedt = min_t(u32, rs485_deat_dedt, FIELD_MAX(USART_CR1_DEAT_MASK));
+ *cr1 |= FIELD_PREP(USART_CR1_DEAT_MASK, rs485_deat_dedt);
if (over8)
rs485_deat_dedt = delay_DDE * baud * 8;
else
rs485_deat_dedt = delay_DDE * baud * 16;
- rs485_deat_dedt = DIV_ROUND_CLOSEST(rs485_deat_dedt, 1000);
- rs485_deat_dedt = rs485_deat_dedt > rs485_deat_dedt_max ?
- rs485_deat_dedt_max : rs485_deat_dedt;
- rs485_deat_dedt = (rs485_deat_dedt << USART_CR1_DEDT_SHIFT) &
- USART_CR1_DEDT_MASK;
- *cr1 |= rs485_deat_dedt;
+ rs485_deat_dedt = DIV_ROUND_UP(rs485_deat_dedt, 1000);
+ rs485_deat_dedt = min_t(u32, rs485_deat_dedt, FIELD_MAX(USART_CR1_DEDT_MASK));
+ *cr1 |= FIELD_PREP(USART_CR1_DEDT_MASK, rs485_deat_dedt);
}
static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *termios,
@@ -850,9 +840,9 @@ static void stm32_usart_tx_dma_complete(void *arg)
pm_runtime_get(port->dev);
/* Let's see if we have pending data to send */
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
stm32_usart_transmit_chars(port);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
@@ -1142,7 +1132,7 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
if (!stm32_port->throttled) {
if (((sr & USART_SR_RXNE) && !stm32_usart_rx_dma_started(stm32_port)) ||
((sr & USART_SR_ERR_MASK) && stm32_usart_rx_dma_started(stm32_port))) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
size = stm32_usart_receive_chars(port, false);
uart_unlock_and_check_sysrq(port);
if (size)
@@ -1153,15 +1143,15 @@ static irqreturn_t stm32_usart_interrupt(int irq, void *ptr)
}
if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch)) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
stm32_usart_transmit_chars(port);
- spin_unlock(&port->lock);
+ uart_port_unlock(port);
ret = IRQ_HANDLED;
}
/* Receiver timeout irq for DMA RX */
if (stm32_usart_rx_dma_started(stm32_port) && !stm32_port->throttled) {
- spin_lock(&port->lock);
+ uart_port_lock(port);
size = stm32_usart_receive_chars(port, false);
uart_unlock_and_check_sysrq(port);
if (size)
@@ -1319,7 +1309,7 @@ static void stm32_usart_unthrottle(struct uart_port *port)
if (stm32_port->rx_ch)
stm32_usart_rx_dma_start_or_resume(port);
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
/* Port is unthrottled, balance pm_runtime */
pm_runtime_mark_last_busy(port->dev);
@@ -1345,7 +1335,6 @@ static void stm32_usart_stop_rx(struct uart_port *port)
pm_runtime_put_autosuspend(port->dev);
}
-/* Handle breaks - ignored by us */
static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
{
struct stm32_port *stm32_port = to_stm32_port(port);
@@ -1701,12 +1690,6 @@ static void stm32_usart_set_termios(struct uart_port *port,
cr1 &= ~(USART_CR1_DEDT_MASK | USART_CR1_DEAT_MASK);
}
- /* Configure wake up from low power on start bit detection */
- if (stm32_port->wakeup_src) {
- cr3 &= ~USART_CR3_WUS_MASK;
- cr3 |= USART_CR3_WUS_START_BIT;
- }
-
writel_relaxed(cr3, port->membase + ofs->cr3);
writel_relaxed(cr2, port->membase + ofs->cr2);
writel_relaxed(cr1, port->membase + ofs->cr1);
@@ -1765,9 +1748,9 @@ static void stm32_usart_pm(struct uart_port *port, unsigned int state,
clk_prepare_enable(stm32port->clk);
break;
case UART_PM_STATE_OFF:
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
stm32_usart_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
clk_disable_unprepare(stm32port->clk);
break;
@@ -1910,7 +1893,6 @@ static int stm32_usart_init_port(struct stm32_port *stm32port,
port->flags = UPF_BOOT_AUTOCONF;
port->ops = &stm32_uart_ops;
port->dev = &pdev->dev;
- port->fifosize = stm32port->info->cfg.fifosize;
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_STM32_CONSOLE);
port->irq = irq;
port->rs485_config = stm32_usart_config_rs485;
@@ -1928,14 +1910,6 @@ static int stm32_usart_init_port(struct stm32_port *stm32port,
stm32port->swap = stm32port->info->cfg.has_swap &&
of_property_read_bool(pdev->dev.of_node, "rx-tx-swap");
- stm32port->fifoen = stm32port->info->cfg.has_fifo;
- if (stm32port->fifoen) {
- stm32_usart_get_ftcfg(pdev, "rx-threshold",
- &stm32port->rxftcfg);
- stm32_usart_get_ftcfg(pdev, "tx-threshold",
- &stm32port->txftcfg);
- }
-
port->membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(port->membase))
return PTR_ERR(port->membase);
--
2.43.0

321
meta-digi-arm/recipes-kernel/linux/linux-dey/stm32mpcommon/0011-v6.6-stm32mp-rt-r3.patch Normal file
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@ -0,0 +1,321 @@
From: Mike Engel <Mike.Engel@digi.com>
Date: Tue, 12 May 2026 13:15:38 +0200
Subject: [PATCH 2/2] v6.6-stm32mp-rt-r3
Patch doesn't apply cleanly on our kernel due to changes in
the serial driver.
Original patch:
From f6587496f2c5894abf9bcfbd136a9693d0e97f11 Mon Sep 17 00:00:00 2001
From: Christophe Priouzeau <christophe.priouzeau@foss.st.com>
Date: Tue, 16 Dec 2025 13:49:21 +0100
Signed-off-by: Mike Engel <Mike.Engel@digi.com>
Upstream-Status: Pending [specific to ST boards]
---
.../configs/fragment-07-rt-sysvinit.config | 11 +++++
arch/arm/configs/fragment-07-rt.config | 9 +++++
arch/arm/configs/fragment-10-rt-perf.config | 40 +++++++++++++++++++
.../configs/fragment-07-rt-sysvinit.config | 11 +++++
arch/arm64/configs/fragment-07-rt.config | 9 +++++
arch/arm64/configs/fragment-10-rt-perf.config | 40 +++++++++++++++++++
drivers/clocksource/timer-stm32-lp.c | 24 ++++++++++-
drivers/hwtracing/coresight/coresight-cti.h | 10 +++++
drivers/mfd/syscon.c | 3 ++
drivers/tty/serial/stm32-usart.c | 8 ++--
10 files changed, 160 insertions(+), 5 deletions(-)
create mode 100644 arch/arm/configs/fragment-07-rt-sysvinit.config
create mode 100644 arch/arm/configs/fragment-07-rt.config
create mode 100644 arch/arm/configs/fragment-10-rt-perf.config
create mode 100644 arch/arm64/configs/fragment-07-rt-sysvinit.config
create mode 100644 arch/arm64/configs/fragment-07-rt.config
create mode 100644 arch/arm64/configs/fragment-10-rt-perf.config
diff --git a/arch/arm/configs/fragment-07-rt-sysvinit.config b/arch/arm/configs/fragment-07-rt-sysvinit.config
new file mode 100644
index 000000000000..4a858d74d97d
--- /dev/null
+++ b/arch/arm/configs/fragment-07-rt-sysvinit.config
@@ -0,0 +1,11 @@
+CONFIG_CGROUPS=y
+# CONFIG_CGROUP_SCHED is not set
+# CONFIG_CGROUP_PIDS is not set
+# CONFIG_CGROUP_RDMA is not set
+# CONFIG_CGROUP_FREEZER is not set
+# CONFIG_CGROUP_DEVICE is not set
+# CONFIG_CGROUP_CPUACCT is not set
+# CONFIG_CGROUP_PERF is not set
+# CONFIG_CGROUP_DEBUG is not set
+# CONFIG_CGROUP_NET_PRIO is not set
+# CONFIG_CGROUP_NET_CLASSID is not set
diff --git a/arch/arm/configs/fragment-07-rt.config b/arch/arm/configs/fragment-07-rt.config
new file mode 100644
index 000000000000..aba9d8c25610
--- /dev/null
+++ b/arch/arm/configs/fragment-07-rt.config
@@ -0,0 +1,9 @@
+CONFIG_EXPERT=y
+CONFIG_PREEMPT_RT=y
+
+# Force to have HIGH_RES_TIMERS
+CONFIG_HIGH_RES_TIMERS=y
+
+# Disable CPUFREQ and CPUIDLE
+# CONFIG_CPU_FREQ is not set
+# CONFIG_CPU_IDLE is not set
diff --git a/arch/arm/configs/fragment-10-rt-perf.config b/arch/arm/configs/fragment-10-rt-perf.config
new file mode 100644
index 000000000000..46e67dba9ef8
--- /dev/null
+++ b/arch/arm/configs/fragment-10-rt-perf.config
@@ -0,0 +1,40 @@
+# avoid degrading from-idle transition latencies, disable dyntick
+CONFIG_HZ_PERIODIC=y
+
+# Disable OPTEE RNG over PTA support
+# CONFIG_HW_RANDOM_OPTEE is not set
+
+# Remove power domains management
+# CONFIG_SUSPEND_FREEZER is not set
+# CONFIG_HIBERNATE_CALLBACKS is not set
+# CONFIG_PM_SLEEP is not set
+# CONFIG_PM_TRACE_RTC is not set
+# CONFIG_PM_GENERIC_DOMAINS is not set
+
+#Debugging features
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_PROFILING is not set
+# CONFIG_PSI is not set
+# to Enable ftrace, you need to enable the following configuration:
+# CONFIG_TRACING is not set
+# CONFIG_FTRACE is not set
+# CONFIG_IRQSOFF_TRACER is not set
+# CONFIG_PREEMPT_TRACER is not set
+# CONFIG_SCHED_TRACER is not set
+# CONFIG_FUNCTION_TRACER is not set
+# CONFIG_FTRACE_SYSCALLS is not set
+# CONFIG_STACK_TRACER is not set
+# CONFIG_FUNCTION_PROFILER is not set
+# CONFIG_TIMERLAT_TRACER is not set
+
+#Lockdep activation
+# CONFIG_DEBUG_ATOMIC_SLEEP is not set
+# CONFIG_DEBUG_LOCK_ALLOC is not set
+# CONFIG_DEBUG_MUTEXES is not set
+# CONFIG_DEBUG_SPINLOCK is not set
+# CONFIG_LOCKDEP is not set
+# CONFIG_LOCKUP_DETECTOR is not set
+# CONFIG_PROVE_LOCKING is not set
+# CONFIG_SLUB_DEBUG_ON is not set
+
+# CONFIG_ARM_SMC_WATCHDOG is not set
diff --git a/arch/arm64/configs/fragment-07-rt-sysvinit.config b/arch/arm64/configs/fragment-07-rt-sysvinit.config
new file mode 100644
index 000000000000..4a858d74d97d
--- /dev/null
+++ b/arch/arm64/configs/fragment-07-rt-sysvinit.config
@@ -0,0 +1,11 @@
+CONFIG_CGROUPS=y
+# CONFIG_CGROUP_SCHED is not set
+# CONFIG_CGROUP_PIDS is not set
+# CONFIG_CGROUP_RDMA is not set
+# CONFIG_CGROUP_FREEZER is not set
+# CONFIG_CGROUP_DEVICE is not set
+# CONFIG_CGROUP_CPUACCT is not set
+# CONFIG_CGROUP_PERF is not set
+# CONFIG_CGROUP_DEBUG is not set
+# CONFIG_CGROUP_NET_PRIO is not set
+# CONFIG_CGROUP_NET_CLASSID is not set
diff --git a/arch/arm64/configs/fragment-07-rt.config b/arch/arm64/configs/fragment-07-rt.config
new file mode 100644
index 000000000000..aba9d8c25610
--- /dev/null
+++ b/arch/arm64/configs/fragment-07-rt.config
@@ -0,0 +1,9 @@
+CONFIG_EXPERT=y
+CONFIG_PREEMPT_RT=y
+
+# Force to have HIGH_RES_TIMERS
+CONFIG_HIGH_RES_TIMERS=y
+
+# Disable CPUFREQ and CPUIDLE
+# CONFIG_CPU_FREQ is not set
+# CONFIG_CPU_IDLE is not set
diff --git a/arch/arm64/configs/fragment-10-rt-perf.config b/arch/arm64/configs/fragment-10-rt-perf.config
new file mode 100644
index 000000000000..46e67dba9ef8
--- /dev/null
+++ b/arch/arm64/configs/fragment-10-rt-perf.config
@@ -0,0 +1,40 @@
+# avoid degrading from-idle transition latencies, disable dyntick
+CONFIG_HZ_PERIODIC=y
+
+# Disable OPTEE RNG over PTA support
+# CONFIG_HW_RANDOM_OPTEE is not set
+
+# Remove power domains management
+# CONFIG_SUSPEND_FREEZER is not set
+# CONFIG_HIBERNATE_CALLBACKS is not set
+# CONFIG_PM_SLEEP is not set
+# CONFIG_PM_TRACE_RTC is not set
+# CONFIG_PM_GENERIC_DOMAINS is not set
+
+#Debugging features
+CONFIG_DEBUG_KERNEL=y
+# CONFIG_PROFILING is not set
+# CONFIG_PSI is not set
+# to Enable ftrace, you need to enable the following configuration:
+# CONFIG_TRACING is not set
+# CONFIG_FTRACE is not set
+# CONFIG_IRQSOFF_TRACER is not set
+# CONFIG_PREEMPT_TRACER is not set
+# CONFIG_SCHED_TRACER is not set
+# CONFIG_FUNCTION_TRACER is not set
+# CONFIG_FTRACE_SYSCALLS is not set
+# CONFIG_STACK_TRACER is not set
+# CONFIG_FUNCTION_PROFILER is not set
+# CONFIG_TIMERLAT_TRACER is not set
+
+#Lockdep activation
+# CONFIG_DEBUG_ATOMIC_SLEEP is not set
+# CONFIG_DEBUG_LOCK_ALLOC is not set
+# CONFIG_DEBUG_MUTEXES is not set
+# CONFIG_DEBUG_SPINLOCK is not set
+# CONFIG_LOCKDEP is not set
+# CONFIG_LOCKUP_DETECTOR is not set
+# CONFIG_PROVE_LOCKING is not set
+# CONFIG_SLUB_DEBUG_ON is not set
+
+# CONFIG_ARM_SMC_WATCHDOG is not set
diff --git a/drivers/clocksource/timer-stm32-lp.c b/drivers/clocksource/timer-stm32-lp.c
index dedf59187352..4feb2b79b5eb 100644
--- a/drivers/clocksource/timer-stm32-lp.c
+++ b/drivers/clocksource/timer-stm32-lp.c
@@ -45,7 +45,8 @@ static int stm32_clkevent_lp_shutdown(struct clock_event_device *clkevt)
int loop_limit = 500;
u32 val;
- if (clockevent_state_oneshot(clkevt) || clockevent_state_periodic(clkevt)) {
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT) &&
+ (clockevent_state_oneshot(clkevt) || clockevent_state_periodic(clkevt))) {
ret = pm_runtime_put(priv->dev);
if (ret < 0) {
dev_err(priv->dev, "pm runtime get returned %d\n", ret);
@@ -179,6 +180,13 @@ static int stm32_clkevent_lp_pm_runtime_get(struct clock_event_device *clkevt)
struct stm32_lp_private *priv = to_priv(clkevt);
int ret;
+ /*
+ * When in PREEMPT_RT, pm_runtime acquires a spinlock, that's not allowed in
+ * atomic context. Workaround it by enabling runtime PM upon probe.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return 0;
+
/* Rely on old clockevent state, to balance pm_runtime_get() / pm_runtime_put() calls */
if (clockevent_state_detached(clkevt) || clockevent_state_shutdown(clkevt)) {
ret = pm_runtime_get(priv->dev);
@@ -196,6 +204,9 @@ static void stm32_clkevent_lp_pm_runtime_err(struct clock_event_device *clkevt)
{
struct stm32_lp_private *priv = to_priv(clkevt);
+ if (IS_ENABLED(CONFIG_PREEMPT_RT))
+ return;
+
if (clockevent_state_detached(clkevt) || clockevent_state_shutdown(clkevt))
pm_runtime_put(priv->dev);
}
@@ -351,6 +362,17 @@ static int stm32_clkevent_lp_probe(struct platform_device *pdev)
if (ret)
return ret;
+ /*
+ * When in PREEMPT_RT, pm_runtime acquires a spinlock, that's not allowed in atomic
+ * context. Runtime PM is used to acquire the parent's PM domain, when there's one.
+ * That's not necessarily the case on all instances, so it seems an acceptable trade-off.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret)
+ return ret;
+ }
+
priv->dev = &pdev->dev;
stm32_clkevent_lp_init(priv, pdev->dev.parent->of_node, rate);
diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
index cb9ee616d01f..9f9eaaf29add 100644
--- a/drivers/hwtracing/coresight/coresight-cti.h
+++ b/drivers/hwtracing/coresight/coresight-cti.h
@@ -17,6 +17,16 @@
#include "coresight-priv.h"
+#ifdef CONFIG_PREEMPT_RT
+#undef spin_lock_init
+#define spin_lock_init raw_spin_lock_init
+#define spin_lock raw_spin_lock
+#define spin_unlock raw_spin_unlock
+#undef spin_lock_irqsave
+#define spin_lock_irqsave raw_spin_lock_irqsave
+#define spin_unlock_irqrestore raw_spin_unlock_irqrestore
+#define spinlock_t raw_spinlock_t
+#endif
/*
* Device registers
* 0x000 - 0x144: CTI programming and status
diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index df2e456430d4..7bb8eb972433 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -36,6 +36,9 @@ static const struct regmap_config syscon_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
+#ifdef CONFIG_PREEMPT_RT
+ .use_raw_spinlock = true,
+#endif
};
static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index f13c1bba5fe7..d22de65d7dc7 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -847,7 +847,7 @@ static void stm32_usart_tx_dma_complete(void *arg)
/* Let's see if we have pending data to send */
stm32_usart_transmit_chars(port);
- uart_port_lock_irqsave(port, &flags);
+ uart_port_unlock_irqrestore(port, flags);
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
@@ -1353,7 +1353,7 @@ static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
pm_runtime_get(port->dev);
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
if (break_state) {
if (long_break) {
@@ -1370,7 +1370,7 @@ static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
stm32_usart_clr_bits(port, ofs->rqr, USART_RQR_SBKRQ);
}
- spin_unlock_irqrestore(&port->lock, flags);
+ uart_port_unlock_irqrestore(port, flags);
pm_runtime_mark_last_busy(port->dev);
pm_runtime_put_autosuspend(port->dev);
@@ -2500,7 +2500,7 @@ static int __maybe_unused stm32_usart_serial_en_wakeup(struct uart_port *port,
}
/* Poll data from RX FIFO if any */
- spin_lock_irqsave(&port->lock, flags);
+ uart_port_lock_irqsave(port, &flags);
size = stm32_usart_receive_chars(port, false);
if (size)
tty_flip_buffer_push(tport);
--

4
meta-digi-arm/recipes-kernel/linux/linux-dey_6.6.bb
View File

@ -21,8 +21,8 @@ RT_FILES:use-nxp-bsp = " \
file://fragment-nxp-rt.config \
"
RT_FILES:stm32mpcommon = " \
file://0010-Rebase-on-v6.6.78-rt51.patch \
file://0011-v6.6-stm32mp-rt-r2.patch \
file://0010-Rebase-on-v6.6.116-rt66.patch \
file://0011-v6.6-stm32mp-rt-r3.patch \
file://fragment-08-deactivate-rng.config \
file://fragment-10-network-improvment.config \
"