Solved: Native DSD not working. USBridge with Soekris DAM1021 and Amanero

Code:
/*



 * snd_usb_interface_dsd_format_quirks() is called from format.c to



 * augment the PCM format bit-field for DSD types. The UAC standards



 * don't have a designated bit field to denote DSD-capable interfaces,



 * hence all hardware that is known to support this format has to be



 * listed here.



 */



u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,



                    struct audioformat *fp,



                    unsigned int sample_bytes)



{



    struct usb_interface *iface;







    /* Playback Designs */



    if (USB_ID_VENDOR(chip->usb_id) == 0x23ba &&



        USB_ID_PRODUCT(chip->usb_id) < 0x0110) {



        switch (fp->altsetting) {



        case 1:



            fp->dsd_dop = true;



            return SNDRV_PCM_FMTBIT_DSD_U16_LE;



        case 2:



            fp->dsd_bitrev = true;



            return SNDRV_PCM_FMTBIT_DSD_U8;



        case 3:



            fp->dsd_bitrev = true;



            return SNDRV_PCM_FMTBIT_DSD_U16_LE;



        }



    }







    /* XMOS based USB DACs */



    switch (chip->usb_id) {



    case USB_ID(0x1511, 0x0037): /* AURALiC VEGA */



    case USB_ID(0x2522, 0x0012): /* LH Labs VI DAC Infinity */



    case USB_ID(0x2772, 0x0230): /* Pro-Ject Pre Box S2 Digital */



        if (fp->altsetting == 2)



            return SNDRV_PCM_FMTBIT_DSD_U32_BE;



        break;







    case USB_ID(0x0d8c, 0x0316): /* Hegel HD12 DSD */



    case USB_ID(0x10cb, 0x0103): /* The Bit Opus #3; with fp->dsd_raw */



    case USB_ID(0x16b0, 0x06b2): /* NuPrime DAC-10 */



    case USB_ID(0x16d0, 0x09dd): /* Encore mDSD */



    case USB_ID(0x16d0, 0x0733): /* Furutech ADL Stratos */



    case USB_ID(0x16d0, 0x09db): /* NuPrime Audio DAC-9 */



    case USB_ID(0x1db5, 0x0003): /* Bryston BDA3 */



    case USB_ID(0x22e1, 0xca01): /* HDTA Serenade DSD */



    case USB_ID(0x249c, 0x9326): /* M2Tech Young MkIII */



    case USB_ID(0x2616, 0x0106): /* PS Audio NuWave DAC */



    case USB_ID(0x2622, 0x0041): /* Audiolab M-DAC+ */



    case USB_ID(0x27f7, 0x3002): /* W4S DAC-2v2SE */



    case USB_ID(0x29a2, 0x0086): /* Mutec MC3+ USB */



    case USB_ID(0x6b42, 0x0042): /* MSB Technology */



        if (fp->altsetting == 3)



            return SNDRV_PCM_FMTBIT_DSD_U32_BE;



        break;







    /* Amanero Combo384 USB based DACs with native DSD support */



    case USB_ID(0x16d0, 0x071a):  /* Amanero - Combo384 */



    case USB_ID(0x2ab6, 0x0004):  /* T+A DAC8DSD-V2.0, MP1000E-V2.0, MP2000R-V2.0, MP2500R-V2.0, MP3100HV-V2.0 */



    case USB_ID(0x2ab6, 0x0005):  /* T+A USB HD Audio 1 */



    case USB_ID(0x2ab6, 0x0006):  /* T+A USB HD Audio 2 */



        if (fp->altsetting == 2) {



            switch (le16_to_cpu(chip->dev->descriptor.bcdDevice)) {



            case 0x199:



                return SNDRV_PCM_FMTBIT_DSD_U32_LE;



            case 0x19b:



            case 0x203:



                return SNDRV_PCM_FMTBIT_DSD_U32_BE;



            default:



                break;



            }



        }



        break;



    case USB_ID(0x16d0, 0x0a23):



        if (fp->altsetting == 2)



            return SNDRV_PCM_FMTBIT_DSD_U32_BE;



        break;







    default:



        break;



    }







    /* ITF-USB DSD based DACs */



    if (is_itf_usb_dsd_dac(chip->usb_id)) {



        iface = usb_ifnum_to_if(chip->dev, fp->iface);







        /* Altsetting 2 support native DSD if the num of altsets is



        * three (0-2),



        * Altsetting 3 support native DSD if the num of altsets is



        * four (0-3).



        */



        if (fp->altsetting == iface->num_altsetting - 1)



            return SNDRV_PCM_FMTBIT_DSD_U32_BE;



    }







    /* Mostly generic method to detect many DSD-capable implementations -



    * from XMOS/Thesycon



    */



    switch (USB_ID_VENDOR(chip->usb_id)) {



    case 0x152a:  /* Thesycon devices */



    case 0x20b1:  /* XMOS based devices */



    case 0x22d9:  /* Oppo */



    case 0x23ba:  /* Playback Designs */



    case 0x25ce:  /* Mytek devices */



    case 0x278b:  /* Rotel? */



    case 0x292b:  /* Gustard/Ess based devices */



    case 0x2ab6:  /* T+A devices */



    case 0x3842:  /* EVGA */



    case 0xc502:  /* HiBy devices */



        if (fp->dsd_raw)



            return SNDRV_PCM_FMTBIT_DSD_U32_BE;



        break;



    default:



        break;







    }







    return 0;

}