From: Koro Chen Date: Wed, 13 May 2015 14:39:03 +0000 (+0800) Subject: ALSA: pcm: Modify double acknowledged interrupts check condition X-Git-Tag: omap-for-v4.2/wakeirq-drivers-v2^2~2^2~73^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=13a988396cab68e6c6afd33e461a9e52ce23ff63;p=pandora-kernel.git ALSA: pcm: Modify double acknowledged interrupts check condition Currently in snd_pcm_update_hw_ptr0 during interrupt, we consider there were double acknowledged interrupts when: 1. HW reported pointer is smaller than expected, and 2. Time from last update time (hdelta) is over half a buffer time. However, when HW reported pointer is only a few bytes smaller than expected, and when hdelta is just a little larger than half a buffer time (e.g. ping-pong buffer), it wrongly treats this IRQ as double acknowledged. The condition #2 uses jiffies, but jiffies is not high resolution since it is integer. We should consider jiffies inaccuracy. Signed-off-by: Koro Chen Signed-off-by: Takashi Iwai --- Reading git-diff-tree failed