• David Brownell's avatar
    [PATCH] USB: USB misc OHCI updates · c1bcf4ad
    David Brownell authored
    Here are three minor OHCI changes:
    
    * Turn off periodic dma transfers until they're needed.  Extra DMAs
      consume power, and can trigger problems on marginal systems.
    
    * New module param "power_switching" (default false).  Many boards
      will have no problems with this mode.  It makes OHCI act more like
      most external hubs and like EHCI.
    
    * Minor SMP cleanup affecting display-only usbfs statistics.
    
    On one system, turning off the periodic DMAs made two of the four
    active OHCI controllers work in cases that previously triggered
    "Unrecoverable Error" IRQs.
    c1bcf4ad
ohci-pci.c 9.83 KB