linux-kernel - [PATCH] sound: usb: quirks: add flag for HEM devices to enable native DSD playback

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Message-Id: <20230614113350.25607-1-ltyl@hem-e.com>
Date:   Wed, 14 Jun 2023 13:33:50 +0200
From:   Lukasz Tyl <ltyl@...-e.com>
To:     perex@...ex.cz
Cc:     tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, pgorgon@...-e.com,
        Lukasz Tyl <ltyl@...-e.com>
Subject: [PATCH] sound: usb: quirks: add flag for HEM devices to enable native DSD playback

This commit adds new DEVICE_FLG with QUIRK_FLAG_DSD_RAW and Vendor Id for
HEM devices which supports native DSD. Prior to this change Linux kernel
was not enabling native DSD playback for HEM devices, and as a result,
DSD audio was being converted to PCM "on the fly". HEM devices,
when connected to the system, would only play audio in PCM format,
even if the source material was in DSD format. With the addition of new
VENDOR_FLG in the quircks.c file, the devices are now correctly
recognized, and raw DSD data is transmitted to the device,
allowing for native DSD playback.

Signed-off-by: Lukasz Tyl <ltyl@...-e.com>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 3ecd1ba7fd4b..1414bf15ac21 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2197,6 +2197,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_DSD_RAW),
 	VENDOR_FLG(0xc502, /* HiBy devices */
 		   QUIRK_FLAG_DSD_RAW),
+	VENDOR_FLG(0x3336, /* HEM devices */
+		   QUIRK_FLAG_DSD_RAW),

 	{} /* terminator */
 };
-- 
2.34.1