The patch below was submitted to be applied to the 4.16-stable tree.
I fail to see how this patch meets the stable kernel rules as found at Documentation/process/stable-kernel-rules.rst.
I could be totally wrong, and if so, please respond to stable@vger.kernel.org and let me know why this patch should be applied. Otherwise, it is now dropped from my patch queues, never to be seen again.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From e09070c51b280567695022237e57c428e548b355 Mon Sep 17 00:00:00 2001
From: Hans de Goede hdegoede@redhat.com Date: Fri, 16 Mar 2018 21:28:07 +0100 Subject: [PATCH] Bluetooth: hci_bcm: Add irq_polarity module option
Add irq_polarity module option for easier troubleshooting of irq-polarity issues.
Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Marcel Holtmann marcel@holtmann.org
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c index ff7535e85dea..50c8523f8653 100644 --- a/drivers/bluetooth/hci_bcm.c +++ b/drivers/bluetooth/hci_bcm.c @@ -126,6 +126,10 @@ struct bcm_data { static DEFINE_MUTEX(bcm_device_lock); static LIST_HEAD(bcm_device_list);
+static int irq_polarity = -1; +module_param(irq_polarity, int, 0444); +MODULE_PARM_DESC(irq_polarity, "IRQ polarity 0: active-high 1: active-low"); + static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed) { if (hu->serdev) @@ -989,11 +993,17 @@ static int bcm_acpi_probe(struct bcm_device *dev) } acpi_dev_free_resource_list(&resources);
- dmi_id = dmi_first_match(bcm_active_low_irq_dmi_table); - if (dmi_id) { - dev_warn(dev->dev, "%s: Overwriting IRQ polarity to active low", - dmi_id->ident); - dev->irq_active_low = true; + if (irq_polarity != -1) { + dev->irq_active_low = irq_polarity; + dev_warn(dev->dev, "Overwriting IRQ polarity to active %s by module-param\n", + dev->irq_active_low ? "low" : "high"); + } else { + dmi_id = dmi_first_match(bcm_active_low_irq_dmi_table); + if (dmi_id) { + dev_warn(dev->dev, "%s: Overwriting IRQ polarity to active low", + dmi_id->ident); + dev->irq_active_low = true; + } }
return 0;