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authorAndreas Pape <apape@de.adit-jv.com>2016-12-06 14:46:14 +0900
committerTakashi Iwai <tiwai@suse.de>2016-12-06 13:55:59 +0100
commitfd1a5059610cd3887f1050171a840ca864108730 (patch)
tree749a58c5972b72aec1a78c765f2f9cf4b3e1a776 /sound/atmel
parent1e2e3fe480064ca33186e5a923beaa160efed35d (diff)
ALSA: usb-audio: more tolerant packetsize
since commit 57e6dae1087b ("ALSA: usb-audio: do not trust too-big wMaxPacketSize values"), the expected packetsize is always limited to nominal + 25%. It was discovered, that some devices (Android audio accessory) have a much higher jitter in used packetsizes than 25% which would result in BABBLE condition and dropping of packets. A better solution is so assume the jitter to be the nominal packetsize: -one nearly empty packet followed by a almost 150% sized one. V2: changed to assume max frequency is +50 of nominal packetsize. Signed-off-by: Andreas Pape <apape@de.adit-jv.com> Signed-off-by: Jiada Wang <jiada_wang@mentor.com> Acked-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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