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lf-6.6.y
linux-imx/Documentation/ABI/testing/configfs-usb-gadget-uac2
Pavel Hofman 355a05dc83 usb: gadget: f_uac2: Optionally determine bInterval for HS and SS 
Allow setting configfs params p_hs_bint/c_hs_bint to 0. If they are set
to 0, determine the largest bInterval (4 to 1) for which the required
bandwidth of the max samplerate fits the max allowed packet size. If the
required bandwidth exceeds max bandwidth for single-packet mode
(ep->mc=1), keep bInterval at 1.

The FS speed is left at fixed bInterval=1.

If for any speed the required bandwidth exceeds the max bandwidth
corresponding to the selected/determined bInterval, print a warning.

Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20220127114331.41367-4-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-31 14:26:18 +01:00

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What: /config/usb-gadget/gadget/functions/uac2.name Date: Sep 2014 KernelVersion: 3.18 Description: The attributes:

	=====================	=======================================
	c_chmask		capture channel mask
	c_srate			list of capture sampling rates (comma-separated)
	c_ssize			capture sample size (bytes)
	c_hs_bint		capture bInterval for HS/SS (1-4: fixed, 0: auto)
	c_sync			capture synchronization type
				(async/adaptive)
	c_mute_present		capture mute control enable
	c_volume_present	capture volume control enable
	c_volume_min		capture volume control min value
				(in 1/256 dB)
	c_volume_max		capture volume control max value
				(in 1/256 dB)
	c_volume_res		capture volume control resolution
				(in 1/256 dB)
	fb_max			maximum extra bandwidth in async mode
	p_chmask		playback channel mask
	p_srate			list of playback sampling rates (comma-separated)
	p_ssize			playback sample size (bytes)
	p_hs_bint		playback bInterval for HS/SS (1-4: fixed, 0: auto)
	p_mute_present		playback mute control enable
	p_volume_present	playback volume control enable
	p_volume_min		playback volume control min value
				(in 1/256 dB)
	p_volume_max		playback volume control max value
				(in 1/256 dB)
	p_volume_res		playback volume control resolution
				(in 1/256 dB)
	req_number		the number of pre-allocated requests
				for both capture and playback
	function_name		name of the interface
	=====================	=======================================