[Question] MUSB: why not clear DMA interrupt in musbhsdma.c?

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Hi folks,

I am trying to enable the whole musb HS DMA code on Blackfin. But
found the is no place to clean the DMA interrupt flag in musbhsdma.c.
As a result, the irq always happens with the same DMA irq source. I
add some code to clear the DMA interrupt. Did I miss something here?

After enabling the musb HS DMA code for Blackfin, normal operation is
OK for mount/umount U-disks. But when I tried to write large file to
the U-DISK (such as 10Mbyte or 100Mbyte), speed is very slow and mush
slower than PIO mode, IMO.
Did you guy meet this issue before on OMAP?

Thanks
-Bryan
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