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    Subject[PATCH 4.16 001/196] Bluetooth: hci_bcm: Add irq_polarity module option
    Date
    4.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Hans de Goede <hdegoede@redhat.com>

    commit e09070c51b280567695022237e57c428e548b355 upstream.

    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>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/bluetooth/hci_bcm.c | 20 +++++++++++++++-----
    1 file changed, 15 insertions(+), 5 deletions(-)

    --- 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)
    @@ -975,11 +979,17 @@ static int bcm_acpi_probe(struct bcm_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;

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