Bluetooth: hci_bcm: Treat Interrupt ACPI resources as always being active-low

Older devices with a serdev attached bcm bt hci, use an Interrupt ACPI
resource to describe the IRQ (rather then a GpioInt resource).

These device seem to all claim the IRQ is active-high and seem to all need
a DMI quirk to treat it as active-low. Instead simply always assume that
Interrupt resource specified IRQs are always active-low.

This fixes the bt device not being able to wake the host from runtime-
suspend on the: Asus T100TAM, Asus T200TA, Lenovo Yoga2 and the Toshiba
Encore, without the need to add 4 new DMI quirks for these models.

This also allows us to remove 2 DMI quirks for the Asus T100TA and Asus
T100CHI series. Likely the 2 remaining quirks can also be removed but I
could not find a DSDT of these devices to verify this.

Cc: stable@vger.kernel.org
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=198953
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1554835
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 3 insertions, 17 deletions

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 50c8523f8653..ce8c629c0eac 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -799,22 +799,6 @@ static const struct acpi_gpio_mapping acpi_bcm_int_first_gpios[] = {
 #ifdef CONFIG_ACPI
 /* IRQ polarity of some chipsets are not defined correctly in ACPI table. */
 static const struct dmi_system_id bcm_active_low_irq_dmi_table[] = {
-        {
-                .ident = "Asus T100TA",
-                .matches = {
-                        DMI_EXACT_MATCH(DMI_SYS_VENDOR,
-                                        "ASUSTeK COMPUTER INC."),
-                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
-                },
-        },
-        {
-                .ident = "Asus T100CHI",
-                .matches = {
-                        DMI_EXACT_MATCH(DMI_SYS_VENDOR,
-                                        "ASUSTeK COMPUTER INC."),
-                        DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
-                },
-        },
         {       /* Handle ThinkPad 8 tablets with BCM2E55 chipset ACPI ID */
                 .ident = "Lenovo ThinkPad 8",
                 .matches = {
@@ -842,7 +826,9 @@ static int bcm_resource(struct acpi_resource *ares, void *data)
         switch (ares->type) {
         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
                 irq = &ares->data.extended_irq;
-                dev->irq_active_low = irq->polarity == ACPI_ACTIVE_LOW;
+                if (irq->polarity != ACPI_ACTIVE_LOW)
+                        dev_info(dev->dev, "ACPI Interrupt resource is active-high, this is usually wrong, treating the IRQ as active-low\n");
+                dev->irq_active_low = true;
                 break;
 
         case ACPI_RESOURCE_TYPE_GPIO: