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author | Koro Chen <koro.chen@mediatek.com> | 2015-05-13 17:39:03 +0300 |
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committer | Takashi Iwai <tiwai@suse.de> | 2015-05-19 10:32:29 +0300 |
commit | 13a988396cab68e6c6afd33e461a9e52ce23ff63 (patch) | |
tree | 546fd85f5d70daee71117ae79a1a7cb556ac6881 /sound/usb | |
parent | 5a6cc82171dba297ceab49cda47f2bf5616f87b3 (diff) | |
download | linux-13a988396cab68e6c6afd33e461a9e52ce23ff63.tar.xz |
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 <koro.chen@mediatek.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
0 files changed, 0 insertions, 0 deletions