[PATCH 6.8 121/158] mei: vsc: Unregister interrupt handler for system suspend

Greg Kroah-Hartman
2024-04-23T21:42:08Z

From: Sakari Ailus <sakari.ailus@linux.intel.com>

commit f6085a96c97387154be7eaebd1a5420eb3cd55dc upstream.

Unregister the MEI VSC interrupt handler before system suspend and
re-register it at system resume time. This mirrors implementation of other
MEI devices.

This patch fixes the bug that causes continuous stream of MEI VSC errors
after system resume.

Fixes: 386a766c4169 ("mei: Add MEI hardware support for IVSC device")
Cc: stable@vger.kernel.org # for 6.8
Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Wentong Wu <wentong.wu@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20240403051341.3534650-2-wentong.wu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/misc/mei/platform-vsc.c | 17 +++++++-
drivers/misc/mei/vsc-tp.c | 84 ++++++++++++++++++++++++++++------------
drivers/misc/mei/vsc-tp.h | 3 +
3 files changed, 78 insertions(+), 26 deletions(-)

--- a/drivers/misc/mei/platform-vsc.c
+++ b/drivers/misc/mei/platform-vsc.c
@@ -402,25 +402,40 @@ static int mei_vsc_remove(struct platfor
static int mei_vsc_suspend(struct device *dev)
{
struct mei_device *mei_dev = dev_get_drvdata(dev);
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);

mei_stop(mei_dev);

+ mei_disable_interrupts(mei_dev);
+
+ vsc_tp_free_irq(hw->tp);
+
return 0;
}

static int mei_vsc_resume(struct device *dev)
{
struct mei_device *mei_dev = dev_get_drvdata(dev);
+ struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
int ret;

- ret = mei_restart(mei_dev);
+ ret = vsc_tp_request_irq(hw->tp);
if (ret)
return ret;

+ ret = mei_restart(mei_dev);
+ if (ret)
+ goto err_free;
+
/* start timer if stopped in suspend */
schedule_delayed_work(&mei_dev->timer_work, HZ);

return 0;
+
+err_free:
+ vsc_tp_free_irq(hw->tp);
+
+ return ret;
}

static DEFINE_SIMPLE_DEV_PM_OPS(mei_vsc_pm_ops, mei_vsc_suspend, mei_vsc_resume);
--- a/drivers/misc/mei/vsc-tp.c
+++ b/drivers/misc/mei/vsc-tp.c
@@ -94,6 +94,27 @@ static const struct acpi_gpio_mapping vs
{}
};

+static irqreturn_t vsc_tp_isr(int irq, void *data)
+{
+ struct vsc_tp *tp = data;
+
+ atomic_inc(&tp->assert_cnt);
+
+ wake_up(&tp->xfer_wait);
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t vsc_tp_thread_isr(int irq, void *data)
+{
+ struct vsc_tp *tp = data;
+
+ if (tp->event_notify)
+ tp->event_notify(tp->event_notify_context);
+
+ return IRQ_HANDLED;
+}
+
/* wakeup firmware and wait for response */
static int vsc_tp_wakeup_request(struct vsc_tp *tp)
{
@@ -384,6 +405,37 @@ int vsc_tp_register_event_cb(struct vsc_
EXPORT_SYMBOL_NS_GPL(vsc_tp_register_event_cb, VSC_TP);

/**
+ * vsc_tp_request_irq - request irq for vsc_tp device
+ * @tp: vsc_tp device handle
+ */
+int vsc_tp_request_irq(struct vsc_tp *tp)
+{
+ struct spi_device *spi = tp->spi;
+ struct device *dev = &spi->dev;
+ int ret;
+
+ irq_set_status_flags(spi->irq, IRQ_DISABLE_UNLAZY);
+ ret = request_threaded_irq(spi->irq, vsc_tp_isr, vsc_tp_thread_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(dev), tp);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_request_irq, VSC_TP);
+
+/**
+ * vsc_tp_free_irq - free irq for vsc_tp device
+ * @tp: vsc_tp device handle
+ */
+void vsc_tp_free_irq(struct vsc_tp *tp)
+{
+ free_irq(tp->spi->irq, tp);
+}
+EXPORT_SYMBOL_NS_GPL(vsc_tp_free_irq, VSC_TP);
+
+/**
* vsc_tp_intr_synchronize - synchronize vsc_tp interrupt
* @tp: vsc_tp device handle
*/
@@ -413,27 +465,6 @@ void vsc_tp_intr_disable(struct vsc_tp *
}
EXPORT_SYMBOL_NS_GPL(vsc_tp_intr_disable, VSC_TP);

-static irqreturn_t vsc_tp_isr(int irq, void *data)
-{
- struct vsc_tp *tp = data;
-
- atomic_inc(&tp->assert_cnt);
-
- wake_up(&tp->xfer_wait);
-
- return IRQ_WAKE_THREAD;
-}
-
-static irqreturn_t vsc_tp_thread_isr(int irq, void *data)
-{
- struct vsc_tp *tp = data;
-
- if (tp->event_notify)
- tp->event_notify(tp->event_notify_context);
-
- return IRQ_HANDLED;
-}
-
static int vsc_tp_match_any(struct acpi_device *adev, void *data)
{
struct acpi_device **__adev = data;
@@ -485,10 +516,9 @@ static int vsc_tp_probe(struct spi_devic
tp->spi = spi;

irq_set_status_flags(spi->irq, IRQ_DISABLE_UNLAZY);
- ret = devm_request_threaded_irq(dev, spi->irq, vsc_tp_isr,
- vsc_tp_thread_isr,
- IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
- dev_name(dev), tp);
+ ret = request_threaded_irq(spi->irq, vsc_tp_isr, vsc_tp_thread_isr,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ dev_name(dev), tp);
if (ret)
return ret;

@@ -522,6 +552,8 @@ static int vsc_tp_probe(struct spi_devic
err_destroy_lock:
mutex_destroy(&tp->mutex);

+ free_irq(spi->irq, tp);
+
return ret;
}

@@ -532,6 +564,8 @@ static void vsc_tp_remove(struct spi_dev
platform_device_unregister(tp->pdev);

mutex_destroy(&tp->mutex);
+
+ free_irq(spi->irq, tp);
}

static const struct acpi_device_id vsc_tp_acpi_ids[] = {
--- a/drivers/misc/mei/vsc-tp.h
+++ b/drivers/misc/mei/vsc-tp.h
@@ -37,6 +37,9 @@ int vsc_tp_xfer(struct vsc_tp *tp, u8 cm
int vsc_tp_register_event_cb(struct vsc_tp *tp, vsc_tp_event_cb_t event_cb,
void *context);

+int vsc_tp_request_irq(struct vsc_tp *tp);
+void vsc_tp_free_irq(struct vsc_tp *tp);
+
void vsc_tp_intr_enable(struct vsc_tp *tp);
void vsc_tp_intr_disable(struct vsc_tp *tp);
void vsc_tp_intr_synchronize(struct vsc_tp *tp);