linux-kernel - Re: [PATCH] ALSA: usb-audio: Add Hiby R3 to quirks for native DSD support

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Message-ID: <021132df-8deb-b9f0-2d9e-e934f92c6c7a@sonarnerd.net>
Date:   Mon, 26 Aug 2019 20:10:28 +0300
From:   Jussi Laako <jussi@...arnerd.net>
To:     ilya.pshonkin@...force.ua
Cc:     Sudokamikaze <sudokamikaze@...tonmail.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Richard Fontana <rfontana@...hat.com>,
        Manuel Reinhardt <manuel.rhdt@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: usb-audio: Add Hiby R3 to quirks for native DSD
 support

> +	/* ESS Sabre based USB DACs */
> +	case USB_ID(0xc502, 0x0051): /* Hiby R3 */
> +		if (fp->altsetting == 4)
> +			return SNDRV_PCM_FMTBIT_DSD_U32_BE;
> +		break;

Do you know who's vendor id is this? ESS Sabre is a DAC chip with I2S 
input, I'm not aware of any product from ESS under Sabre brand that 
would include USB interface. (?) So likely the USB interface is sourced 
from somewhere else...

It is good to check with "lsusb -vvv" if the device flags DSD altsetting 
as raw. Then you know it'll work with the auto-detection code and 
doesn't break so easily if firmware update changes altsettings (not 
uncommon to happen).

	- Jussi