5.4-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Ratiu adrian.ratiu@collabora.com
[ Upstream commit b50a3e98442b8d72f061617c7f7a71f7dba19484 ]
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 Link: https://patch.msgid.link/20241209090529.16134-2-adrian.ratiu@collabora.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 11a4454c6f64..b29190042f30 100644 --- a/sound/usb/format.c +++ b/sound/usb/format.c @@ -61,6 +61,8 @@ 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; @@ -72,8 +74,11 @@ 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;