From: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
To: Cezary Rojewski <cezary.rojewski@intel.com>,
Takashi Iwai <tiwai@suse.de>
Cc: broonie@kernel.org, tiwai@suse.com, perex@perex.cz,
amadeuszx.slawinski@linux.intel.com, linux-sound@vger.kernel.org,
gregkh@linuxfoundation.org, quic_wcheng@quicinc.com,
mathias.nyman@linux.intel.com
Subject: Re: [RFC 00/15] ALSA/ASoC: USB Audio Offload
Date: Tue, 22 Apr 2025 13:28:06 +0200 [thread overview]
Message-ID: <a05a3419-8acc-47e4-bf06-8d87aca444cf@linux.dev> (raw)
In-Reply-To: <5f3c62e3-6993-4595-80fc-eb77c0c11f1d@intel.com>
> In regard to the HDAudio point, I see clear benefits by having HDAudio and USB aligned in the approach on ASoC side. It's a path that's known, works and is well tested.
The current direction for HDaudio is to have the DSP handle ALL streams with DSP-enabled drivers (or none with snd-hda-intel).
But for USB we absolutely need the ability to bypass the DSP when the resources are exceeded (too many endpoints, too many channels, etc), or when low-latency is required (lowering CPU utilization comes at the expense of latency).
In other words, the USB solution MUST expose two PCM paths, a legacy one and a DSP-one, and a sideband communication between DSP and legacy drivers to manage resources.
HDAudio has none of those concepts, which makes it hard to see what the suggested alignment is?
next prev parent reply other threads:[~2025-04-22 11:54 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-09 11:07 [RFC 00/15] ALSA/ASoC: USB Audio Offload Cezary Rojewski
2025-04-09 11:07 ` [RFC 01/15] ALSA: usb: Move media-filters to the media code Cezary Rojewski
2025-04-09 11:07 ` [RFC 02/15] ALSA: usb: Drop private_free() usage for card and pcms Cezary Rojewski
2025-04-09 11:07 ` [RFC 03/15] ALSA: usb: Relocate the usbaudio header file Cezary Rojewski
2025-04-09 11:07 ` [RFC 04/15] ALSA: usb: Implement two-stage quirk applying mechanism Cezary Rojewski
2025-04-09 11:07 ` [RFC 05/15] ALSA: usb: Implement two-stage stream creation mechanism Cezary Rojewski
2025-04-09 11:07 ` [RFC 06/15] ALSA: usb: Implement two-stage chip probing mechanism Cezary Rojewski
2025-04-09 11:07 ` [RFC 07/15] ALSA: usb: Switch to the two-stage chip probing Cezary Rojewski
2025-04-09 11:07 ` [RFC 08/15] ALSA: usb: Switch to the two-stage stream creation Cezary Rojewski
2025-04-09 11:07 ` [RFC 09/15] ALSA: usb: Switch to the two-stage quirk applying Cezary Rojewski
2025-04-09 11:07 ` [RFC 10/15] ALSA: usb: Export PCM operations Cezary Rojewski
2025-04-09 11:07 ` [RFC 11/15] ALSA: usb: Export usb_interface driver operations Cezary Rojewski
2025-04-09 11:07 ` [RFC 12/15] ALSA: usb: Export card-naming procedure Cezary Rojewski
2025-04-09 11:07 ` [RFC 13/15] ALSA: usb: Add getters to obtain endpoint information Cezary Rojewski
2025-04-09 11:07 ` [RFC 14/15] ASoC: codecs: Add USB-Audio driver Cezary Rojewski
2025-04-09 11:07 ` [RFC 15/15] ASoC: Intel: avs: Add USB machine board Cezary Rojewski
2025-04-09 12:10 ` [RFC 00/15] ALSA/ASoC: USB Audio Offload Greg KH
2025-04-09 13:06 ` Cezary Rojewski
2025-04-10 10:10 ` Takashi Iwai
2025-04-10 10:24 ` Takashi Iwai
2025-04-11 9:39 ` Cezary Rojewski
2025-04-15 16:15 ` Takashi Iwai
2025-04-17 10:15 ` Cezary Rojewski
2025-04-22 11:28 ` Pierre-Louis Bossart [this message]
2025-04-22 14:15 ` Cezary Rojewski
2025-04-25 16:53 ` Pierre-Louis Bossart
2025-04-11 14:04 ` Greg KH
2025-04-11 16:51 ` Cezary Rojewski
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