[PATCH v2 1/2] sound: usb: enable DSD output for ddHiFi TC44C

[PATCH v2 1/2] sound: usb: enable DSD output for ddHiFi TC44C

[Adrian Ratiu]

This is a UAC 2 DAC capable of raw DSD on intf 2 alt 4:

Bus 007 Device 004: ID 262a:9302 SAVITECH Corp. TC44C
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          239 Miscellaneous Device
  bDeviceSubClass         2 [unknown]
  bDeviceProtocol         1 Interface Association
  bMaxPacketSize0        64
  idVendor           0x262a SAVITECH Corp.
  idProduct          0x9302 TC44C
  bcdDevice            0.01
  iManufacturer           1 DDHIFI
  iProduct                2 TC44C
  iSerial                 6 5000000001
.......
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        2
      bAlternateSetting       4
      bNumEndpoints           2
      bInterfaceClass         1 Audio
      bInterfaceSubClass      2 Streaming
      bInterfaceProtocol      32
      iInterface              0
	AudioStreaming Interface Descriptor:
          bLength                16
          bDescriptorType        36
          bDescriptorSubtype     1 (AS_GENERAL)
          bTerminalLink          3
          bmControls             0x00
          bFormatType            1
          bmFormats              0x80000000
          bNrChannels            2
          bmChannelConfig        0x00000000
          iChannelNames          0
.......

Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 00101875d9a8..0e97d076a113 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2323,6 +2323,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_DSD_RAW),
 	DEVICE_FLG(0x2522, 0x0007, /* LH Labs Geek Out HD Audio 1V5 */
 		   QUIRK_FLAG_SET_IFACE_FIRST),
+	DEVICE_FLG(0x262a, 0x9302, /* ddHiFi TC44C */
+		   QUIRK_FLAG_DSD_RAW),
 	DEVICE_FLG(0x2708, 0x0002, /* Audient iD14 */
 		   QUIRK_FLAG_IGNORE_CTL_ERROR),
 	DEVICE_FLG(0x2912, 0x30c8, /* Audioengine D1 */
-- 
2.45.2

[PATCH v2 2/2] sound: usb: format: don't warn that raw DSD is unsupported

[Adrian Ratiu]

UAC 2 & 3 DAC's set bit 31 of the format to signal support for a
RAW_DATA type, typically used for DSD playback.

This is correctly tested by (format & UAC*_FORMAT_TYPE_I_RAW_DATA),
fp->dsd_raw = true; and call snd_usb_interface_dsd_format_quirks(),
however a confusing and unnecessary message gets printed because
the bit is not properly tested in the last "unsupported" if test:
if (format & ~0x3F) { ... }

For example the output:

usb 7-1: new high-speed USB device number 5 using xhci_hcd
usb 7-1: New USB device found, idVendor=262a, idProduct=9302, bcdDevice=0.01
usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
usb 7-1: Product: TC44C
usb 7-1: Manufacturer: TC44C
usb 7-1: SerialNumber: 5000000001
hid-generic 0003:262A:9302.001E: No inputs registered, leaving
hid-generic 0003:262A:9302.001E: hidraw6: USB HID v1.00 Device [DDHIFI TC44C] on usb-0000:08:00.3-1/input0
usb 7-1: 2:4 : unsupported format bits 0x100000000

This last "unsupported format" is actually wrong: we know the
format is a RAW_DATA which we assume is DSD, so there is no need
to print the confusing message.

This we unset bit 31 of the format after recognizing it, to avoid
the message.

Suggested-by: Takashi Iwai <tiwai@suse.com>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
---
 sound/usb/format.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/usb/format.c b/sound/usb/format.c
index 0cbf1d4fbe6e..6049d957694c 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -60,6 +60,8 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
 			pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
 			/* flag potentially raw DSD capable altsettings */
 			fp->dsd_raw = true;
+			/* clear special format bit to avoid "unsupported format" msg below */
+			format &= ~UAC2_FORMAT_TYPE_I_RAW_DATA;
 		}
 
 		format <<= 1;
@@ -71,8 +73,11 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
 		sample_width = as->bBitResolution;
 		sample_bytes = as->bSubslotSize;
 
-		if (format & UAC3_FORMAT_TYPE_I_RAW_DATA)
+		if (format & UAC3_FORMAT_TYPE_I_RAW_DATA) {
 			pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
+			/* clear special format bit to avoid "unsupported format" msg below */
+			format &= ~UAC3_FORMAT_TYPE_I_RAW_DATA;
+		}
 
 		format <<= 1;
 		break;
-- 
2.45.2

Re: [PATCH v2 1/2] sound: usb: enable DSD output for ddHiFi TC44C

[Takashi Iwai]

On Mon, 09 Dec 2024 10:05:28 +0100,
Adrian Ratiu wrote:
> 
> This is a UAC 2 DAC capable of raw DSD on intf 2 alt 4:
> 
> Bus 007 Device 004: ID 262a:9302 SAVITECH Corp. TC44C
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass          239 Miscellaneous Device
>   bDeviceSubClass         2 [unknown]
>   bDeviceProtocol         1 Interface Association
>   bMaxPacketSize0        64
>   idVendor           0x262a SAVITECH Corp.
>   idProduct          0x9302 TC44C
>   bcdDevice            0.01
>   iManufacturer           1 DDHIFI
>   iProduct                2 TC44C
>   iSerial                 6 5000000001
> .......
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        2
>       bAlternateSetting       4
>       bNumEndpoints           2
>       bInterfaceClass         1 Audio
>       bInterfaceSubClass      2 Streaming
>       bInterfaceProtocol      32
>       iInterface              0
> 	AudioStreaming Interface Descriptor:
>           bLength                16
>           bDescriptorType        36
>           bDescriptorSubtype     1 (AS_GENERAL)
>           bTerminalLink          3
>           bmControls             0x00
>           bFormatType            1
>           bmFormats              0x80000000
>           bNrChannels            2
>           bmChannelConfig        0x00000000
>           iChannelNames          0
> .......
> 
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>

Applied both patches now.  Thanks.


Takashi