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authorIvo van Doorn <ivdoorn@gmail.com>2010-08-30 21:15:19 +0200
committerJohn W. Linville <linville@tuxdriver.com>2010-08-31 14:22:25 -0400
commit652a9dd2a0c07251e328519cc23f1316ab13ed51 (patch)
tree836afb7f5062716ce7391ad242786c1d2b3d2bd9 /sound
parent0e3afe5b20c4ccdeff5178c62b557a917945a828 (diff)
rt2x00: Split watchdog check into a DMA and STATUS timeout
The watchdog for rt2800usb triggers frequently causing all URB's to be canceled often enough to interrupt the normal TX flow. More research indicated that not the URB upload to the USB host were hanging, but instead the TX status reports. To correctly detect what is going on, we introduce Q_INDEX_DMA_DONE which is an index counter between Q_INDEX_DONE and Q_INDEX and indicates if the frame has been transfered to the device. This also requires the rt2x00queue timeout functions to be updated to differentiate between a DMA timeout (time between Q_INDEX and Q_INDEX_DMA_DONE timeout) and a STATUS timeout (time between Q_INDEX_DMA_DONE and Q_INDEX_DONE timeout) All Q_INDEX_DMA_DONE code was taken from the RFC from Helmut Schaa <helmut.schaa@googlemail.com> for the implementation for watchdog for rt2800pci. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'sound')
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