BMC/Intel-BMC/linux.git/sound/usb/clock.c, branch dev

ALSA: usb-audio: Don't attempt to get Lifecam HD-5000 sample rate

2015-02-17T06:20:04+00:00

Adds a quirk to disable the check that the sample rate has been set correctly, as the Lifecam does not support getting the sample rate. This means that we don't need to wait for the USB timeout when attempting to get the sample rate. Waiting for the timeout causes problems in some applications, which give up on the device acquisition process before it has had time to complete, resulting in no sound. [minor tidy up by tiwai] Signed-off-by: Joe Turner Signed-off-by: Takashi Iwai

ALSA: usb-audio: Use standard printk helpers

2014-02-26T15:45:34+00:00

Convert with dev_err() and co from snd_printk(), etc. As there are too deep indirections (e.g. ep->chip->dev->dev), a few new local macros, usb_audio_err() & co, are introduced. Also, the device numbers in some messages are dropped, as they are shown in the prefix automatically. Signed-off-by: Takashi Iwai

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