linux.git/sound/usb/clock.c, branch v3.12

ALSA: usb-audio: store protocol version in struct audioformat

2013-06-27T19:59:47+00:00

Instead of reading bInterfaceProtocol from the descriptor whenever it's
needed, store this value in the audioformat structure.  Besides
simplifying some code, this will allow us to correctly handle vendor-
specific devices where the descriptors are marked with other values.

Signed-off-by: Clemens Ladisch

ALSA: usb - Avoid unnecessary sample rate changes on USB 2.0 clock sources

2013-04-26T05:37:09+00:00

The Scarlett 2i2 seems to take almost 500 ms to set the sample rate,
even if the clock is currently set to that value. This patch speeds
up prepare of the device, by avoiding setting the clock to something
it already is.

Signed-off-by: David Henningsson 
Signed-off-by: Takashi Iwai

ALSA: snd-usb: Playback Design: use usb_set_inferface quirk from more locations

2013-04-10T07:21:43+00:00

It turns out the devices from Playback Design need the delay quirk
after usb_set_interface from clocks.c as well. Make it a proper
quirks function and factor out the code to quirks.c.

Signed-off-by: Daniel Mack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: UAC2: support read-only freq control

2013-04-04T06:32:07+00:00

Some clocks might be read-only, e.g., external clocks (see also
UAC2 4.7.2.1).

In this case, setting the sample frequency will always fail
(even if the rate is equal to the current clock rate),
therefore do not write, but read the value and compare to the
requested rate.
If the clock is read only, avoid reading it twice.

If it doesn't match, return -ENXIO since the clock is invalid for
this configuration.

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: show err in set_sample_rate_v2 debug

2013-04-04T06:31:40+00:00

Show the error code returned from the USB subsystem in
the debug messages.

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: UAC2: auto clock selection module param

2013-04-04T06:31:32+00:00

Add a module param to disable auto clock selection.
This is provided for users that expect the audio stream to
fail when the clock source is invalid (e.g., the word clock
was unintentionally disconnected).

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: UAC2: try to find and switch to valid clock

2013-04-04T06:31:14+00:00

If a selector is available on a device, it may be pointing to a
clock source which is currently invalid.
If there is a valid clock source which can be selected, switch
to it.

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: UAC2: do clock validity check earlier

2013-04-04T06:30:59+00:00

Move the check that parse_audio_format_rates_v2() do after
receiving the clock source entity ID directly into the find
function and add a validation flag to the function.

This patch does not introduce any logic flow change.

It is provided to allow introducing automatic clock switching
easier later. By moving this uac_clock_source_is_valid callsite,
2 additional callsites can be avoided.

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: use endianness macros

2013-04-04T06:30:49+00:00

Replace the endianness conversions with the kernel-wide swabbing macros
in get/set_sample_rate_v2.

Signed-off-by: Eldad Zack 
Signed-off-by: Takashi Iwai

ALSA: usb-audio: Clean up the code in set_sample_rate_v2()

2013-04-03T17:08:29+00:00

Just for cleaning up, introduce a new function get_sample_rate_v2()
for replacing two identical calls in set_sample_rate_v2().

No functional change.

Signed-off-by: Takashi Iwai