[PATCH 0/1] Mark NeuralDSP Quad Cortex as not supporting DSD playback

[PATCH 0/1] Mark NeuralDSP Quad Cortex as not supporting DSD playback

[Phil Willoughby]

USB Vendor ID 0x152a is owned by a company which produces firmware for other
company's devices. Some of those devices support DSD playback and some do not.

I'm not totally comfortable adding the first ever zero-quirks device entry to
the quirk flags table, but it does appear to have worked.

This patch preserves the current assumption that all of this vendor's devices
will support DSD unless explicitly disabled in this way. I will ask them if
that is a good assumption and if they can give me a list of existing USB pids
and whether they are DSD devices.

Cc: Yue Wang <yuleopen@gmail.com>

Phil Willoughby (1):
  NeuralDSP Quad Cortex isn't a DSD Device

 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.53.0

[PATCH 1/1] NeuralDSP Quad Cortex isn't a DSD Device

[Phil Willoughby]

Signed-off-by: Phil Willoughby <willerz@gmail.com>
Cc: Yue Wang <yuleopen@gmail.com>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 4955cbe3b60a..67e812bd9113 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2361,6 +2361,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_PLAYBACK_FIRST | QUIRK_FLAG_GENERIC_IMPLICIT_FB),
 	DEVICE_FLG(0x13e5, 0x0001, /* Serato Phono */
 		   QUIRK_FLAG_IGNORE_CTL_ERROR),
+	DEVICE_FLG(0x152a, 0x880a, /* NeuralDSP Quad Cortex */
+		   0), /* Doesn't have the vendor quirk which would otherwise apply */
 	DEVICE_FLG(0x154e, 0x1002, /* Denon DCD-1500RE */
 		   QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY),
 	DEVICE_FLG(0x154e, 0x1003, /* Denon DA-300USB */
-- 
2.53.0

Re: [PATCH 1/1] NeuralDSP Quad Cortex isn't a DSD Device

[Geraldo Nascimento]

Hi Phil,

On Fri, Mar 27, 2026 at 09:21:01PM +0000, Phil Willoughby wrote:
> Signed-off-by: Phil Willoughby <willerz@gmail.com>
> Cc: Yue Wang <yuleopen@gmail.com>
> ---
>  sound/usb/quirks.c | 2 ++
>  1 file changed, 2 insertions(+)
>

Please provide an appropriate commit message and remember to Cc: the
relevant maintainers.

Thanks,
Geraldo Nascimento

> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 4955cbe3b60a..67e812bd9113 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -2361,6 +2361,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
>  		   QUIRK_FLAG_PLAYBACK_FIRST | QUIRK_FLAG_GENERIC_IMPLICIT_FB),
>  	DEVICE_FLG(0x13e5, 0x0001, /* Serato Phono */
>  		   QUIRK_FLAG_IGNORE_CTL_ERROR),
> +	DEVICE_FLG(0x152a, 0x880a, /* NeuralDSP Quad Cortex */
> +		   0), /* Doesn't have the vendor quirk which would otherwise apply */
>  	DEVICE_FLG(0x154e, 0x1002, /* Denon DCD-1500RE */
>  		   QUIRK_FLAG_ITF_USB_DSD_DAC | QUIRK_FLAG_CTL_MSG_DELAY),
>  	DEVICE_FLG(0x154e, 0x1003, /* Denon DA-300USB */
> -- 
> 2.53.0
> 
>