[alsa-devel] ASoC : WM5102 Audio Codec needs ACPI support and a baytrail machine driver

16 Jun 2015


      Hi list,
I have a device "Lenovo Yoga 851 F" which have a WM510205 Audio codec
on a Baytrail System.
I have sent already one patch (spi-pxa2xx) raise num_chipselect by one, which
fixes to bind the arizona WM5102 codec as a spi slave attachted on a
pxa2xx spi master device.
I have tried several times and added the ACPI id "WM510205"  to
the arizona-spi.c driver.
The ACPI ID is extracted from the DSDT.dsl of this machine.
But unfortunately it fails and I got only a NULL pointer deference error
in arizona_spi_probe().
I want to request ACPI support for this device and I cannot fix
currently the NULL pointer.
I do not know yet, if I have to add this ACPI id to the arizona-spi
driver (sure,
thats what I am trying and failing) or to the NEW baytrail machine driver.
In this case it should be the bytcr_wm5102.c and byt-wm5102.c, which
does not exists yet.
I have a branched tovalds/master and added (my first attempt) the
above mentioned machine driver on a local branch. The result is only
a dsp boot timeout error.
Any help, ideas, hints, patches to try would be appreciate
sincerely yours
Christian Hartmann
a snap of the dsdt
Device (LPEA)
        {
            Name (_ADR, Zero)  // _ADR: Address
            Name (_HID, "80860F28" /* Intel SST Audio DSP */)  //
_HID: Hardware ID
            Name (_CID, "80860F28" /* Intel SST Audio DSP */)  //
_CID: Compatible ID
            Name (_DDN, "Intel(R) Low Power Audio Controller -
80860F28")  // _DDN: DOS Device Name
            Name (_SUB, "17AA7004")  // _SUB: Subsystem ID
            Name (_UID, One)  // _UID: Unique ID
            Name (_DEP, Package (0x01)  // _DEP: Dependencies
            {
                ^SPI1.AUDI
            })
...
...
Device (AUDI)
            {
                Name (_HID, "WM510205")  // _HID: Hardware ID
                Name (_CID, "WM510205")  // _CID: Compatible ID
                Name (_DDN, "Wolfson Microelectronics Audio WM5102")
// _DDN: DOS Device Name
                Method (_CRS, 0, NotSerialized)  // _CRS: Current
Resource Settings
                {
                    Name (SBUF, ResourceTemplate ()
                    {
                        SpiSerialBus (0x0001, PolarityLow, FourWireMode, 0x08,
                            ControllerInitiated, 0x007A1200, ClockPolarityLow,
                            ClockPhaseFirst, "\_SB.SPI1",
                            0x00, ResourceConsumer, ,
                            )
                        GpioInt (Edge, ActiveLow, ExclusiveAndWake,
PullNone, 0x0000,
                            "\_SB.GPO2", 0x00, ResourceConsumer, ,
                            )
                            {   // Pin list
                                0x0004
                            }
                        GpioIo (Exclusive, PullDefault, 0x0000,
0x0000, IoRestrictionOutputOnly,
                            "\_SB.I2C7.PMIC", 0x00, ResourceConsumer, ,
                            )
                            {   // Pin list
                                0x0003
                            }
                        GpioIo (Exclusive, PullDefault, 0x0000,
0x0000, IoRestrictionOutputOnly,
                            "\_SB.GPO1", 0x00, ResourceConsumer, ,
                            )
                            {   // Pin list
                                0x0017
                            }
                    })