On Thu, Sep 07, 2017 at 02:10:13PM +0200, Frédéric Danis wrote:
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> -static bool acpi_is_spi_i2c_slave(struct acpi_device *device)
> +static bool acpi_is_serial_slave(struct acpi_device *device)
> {
> struct list_head resource_list;
> - bool is_spi_i2c_slave = false;
> + bool is_serial_slave = false;
>
> INIT_LIST_HEAD(&resource_list);
> - acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
> - &is_spi_i2c_slave);
> + acpi_dev_get_resources(device, &resource_list, acpi_check_serial_slave,
> + &is_serial_slave);
> acpi_dev_free_resource_list(&resource_list);
>
> - return is_spi_i2c_slave;
> + return is_serial_slave;
> }
Commit ca9ef3ab68d3 ("ACPI / scan: Recognize Apple SPI and I2C slaves")
which landed in Linus' tree a few days ago changes the function above
to check for Apple device properties if running on an x86 Mac.
When rebasing, please amend the function to check for:
fwnode_property_present(&device->fwnode, "baud")
On Macs an empty ResourceTemplate is returned for uart slaves.
Instead the device properties "baud", "parity", "dataBits", "stopBits"
are provided. An excerpt of the DSDT on a MacBook8,1 is below.
An experimental patch for hci_bcm.c to take advantage of the baud
property is here, though I'm told it doesn't work yet (I don't have
such a machine myself to test):
https://github.com/l1k/linux/commit/8883d6225a92
Discussion on this patch is here:
https://github.com/Dunedan/mbp-2016-linux/issues/29
Thanks,
Lukas
-- cut here --
Scope (\_SB.PCI0.URT0)
{
Device (BLTH)
{
Name (_HID, EisaId ("BCM2E7C")) // _HID: Hardware ID
Name (_CID, "apple-uart-blth") // _CID: Compatible ID
Name (_UID, 0x01) // _UID: Unique ID
Name (_ADR, 0x00) // _ADR: Address
Method (_STA, 0, NotSerialized) // _STA: Status
{
Return (0x0F)
}
Method (_CRS, 0, NotSerialized) // _CRS: Current Resource Settings
{
Name (UBUF, ResourceTemplate ()
{
UartSerialBus (0x0001C200, DataBitsEight, StopBitsOne,
0xC0, LittleEndian, ParityTypeNone, FlowControlHardware,
0x0020, 0x0020, "\\_SB.PCI0.URT0",
0x00, ResourceProducer, ,
)
})
Name (ABUF, ResourceTemplate ()
{
})
If (LNot (OSDW ()))
{
Return (UBUF) /* \_SB_.PCI0.URT0.BLTH._CRS.UBUF */
}
Return (ABUF) /* \_SB_.PCI0.URT0.BLTH._CRS.ABUF */
}
Method (_DSM, 4, NotSerialized) // _DSM: Device-Specific Method
{
If (LEqual (Arg0, ToUUID ("a0b5b7c6-1318-441c-b0c9-fe695eaf949b")))
{
Store (Package (0x08)
{
"baud",
Buffer (0x08)
{
0xC0, 0xC6, 0x2D, 0x00, 0x00, 0x00, 0x00, 0x00 /* ..-..... */
},
"parity",
Buffer (0x08)
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
},
"dataBits",
Buffer (0x08)
{
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
},
"stopBits",
Buffer (0x08)
{
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 /* ........ */
}
}, Local0)
DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
Return (Local0)
}
Return (0x00)
}
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