• Alan Stern's avatar
    [PATCH] USB: uhci Interrupt Latency fix · 09604e5c
    Alan Stern authored
    Paul:
    
    Okay, I think this patch ought to do the trick.  I modified the PM
    suspend/resume code so that on buggy motherboards like yours the suspend
    routine really does a reset, while on normal motherboards the resume
    routine really does a resume.  I haven't tried that part out because,
    truth to tell, I'm a little scared of doing an APM/ACPI suspend.  Not long
    ago I walked away from my computer for about a half-hour, leaving 2.5.69
    running.  When I got back the screen was blank and the machine was totally
    non-responsive.
    
    I changed the delays in reset_hc() to use schedule_timeout() rather than
    wait_ms(), which should make it more friendly.
    
    Finally, I put the USBCMD_FGR back into wakeup_hc().  The reason for it is
    now evident: a wakeup might be the result of a system-initiated event
    as opposed to something requested by a device.
    09604e5c
uhci-hcd.h 13.6 KB