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From: Takashi Iwai <>
To: "Geoffrey D. Bennett" <>
Cc: Daniel Sales <>,,
	Vladimir Sadovnikov <>,
	Markus Schroetter <>,
	Alex Fellows <>
Subject: Re: [PATCH 0/2] ALSA: usb-audio: scarlett2: Read all configuration at init time
Date: Mon, 07 Jun 2021 09:23:34 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Sun, 06 Jun 2021 16:16:44 +0200,
Geoffrey D. Bennett wrote:
> These two patches add support for reading the mixer volumes and mux
> configuration from the hardware when the driver is initialising.
> Previously the ALSA volume controls were initialised to zero and the
> mux configuration set to a fixed default instead of being initialised
> to match the hardware state.
> The ALSA controls for the Scarlett Gen 2 interfaces should now always
> be in sync with the hardware. Thanks to Vladimir Sadovnikov for
> figuring out how to do this.
> Takashi, if these pass your review, I believe that they are
> appropriate for:
> #Cc:

Well, in general, having a proper fixed value for the initial mixer
value is the right thing, which is a part of the driver's role.
Though, in snd-usb-audio, we don't set up the initial values just
because of laziness; since the topology in USB audio is variable per
device and often hard to parse correctly, it's difficult to determine
the suitable initial values, hence we leave untouched.  So, in that
sense, setting the zero isn't wrong, rather safer, per se.

However, Scarlett 2 seems to want to be different; it has already some
initialization code to read the existing configs.  So this change
sounds more or less acceptable.  But it's questionable whether it's
really for stable as a "fix".

In anyway, please fix the bug ktest bot spotted, the missing endian
conversions and resubmit.



  parent reply	other threads:[~2021-06-07  7:24 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-06 14:16 [PATCH 0/2] ALSA: usb-audio: scarlett2: Read all configuration at init time Geoffrey D. Bennett
2021-06-06 14:16 ` [PATCH 1/2] ALSA: usb-audio: scarlett2: Read mixer volumes " Geoffrey D. Bennett
2021-06-06 14:32   ` Markus
2021-06-07  5:23   ` kernel test robot
2021-06-07  5:23     ` kernel test robot
2021-06-06 14:17 ` [PATCH 2/2] ALSA: usb-audio: scarlett2: Read mux " Geoffrey D. Bennett
2021-06-06 14:33   ` Markus
2021-06-07  7:23 ` Takashi Iwai [this message]
     [not found]   ` <>
2021-06-07 15:12     ` [PATCH 0/2] ALSA: usb-audio: scarlett2: Read all configuration " Takashi Iwai
2021-06-07 17:18       ` Markus Schroetter
2021-06-07 19:51   ` Geoffrey D. Bennett

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