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staging: comedi: rtd520: clear FIFO when canceling async command

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Clear the A/D FIFO as part of the analog input (*cancel) to help with
cleaning up the async command.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-09-18 11:35:40 -07:00 committed by Greg Kroah-Hartman
parent 365dae93f7
commit 351a7bffbd
1 changed files with 1 additions and 0 deletions
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drivers/staging/comedi/drivers/rtd520.c
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@ -1083,6 +1083,7 @@ static int rtd_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
devpriv->ai_count = 0; /* stop and don't transfer any more */
status = readw(dev->mmio + LAS0_IT);
overrun = readl(dev->mmio + LAS0_OVERRUN) & 0xffff;
writel(0, dev->mmio + LAS0_ADC_FIFO_CLEAR);
return 0;
}