On Mon, Feb 20, 2012 at 12:58 PM, Richard Watts <rrw@xxxxxxxxxxxxx> wrote: > > There is an erratum in DM3730 which results in the > EHCI USB PLL (DPLL5) not updating sufficiently frequently; this > leads to USB PHY clock drift and once the clock has drifted far > enough, the PHY's ULPI interface stops responding and USB > drops out. This is manifested on a Beagle xM by having the attached > SMSC9514 report 'Cannot enable port 2. Maybe the USB cable is bad?' > or similar. > > The fix is to carefully adjust your DPLL5 settings so as to > keep the PHY clock as close as possible to 120MHz over the long > term; TI SPRZ319e gives a table of such settings and this patch > applies that table to systems with a 13MHz or a 26MHz clock, > thus fixing the issue (inasfar as it can be fixed) on Beagle xM > and Overo Firestorm. > > Signed-off-by: Richard Watts <rrw@xxxxxxxxxxxxx> Has any more testing been done with this? We're running into a situation where the USB subsystem crashes in a beagleboard xM after running for a couple hours to a day. A USB camera is running continuously during this time. The error message typically something like: [ 2817.415710] hub 1-0:1.0: port 2 disabled by hub (EMI?), re-enabling... [ 2817.422607] usb 1-2: USB disconnect, device number 2 [ 2817.427886] usb 1-2.1: USB disconnect, device number 3 [ 2817.441986] usb 1-2.4: USB disconnect, device number 4 [ 2817.450134] usb 1-2.5: USB disconnect, device number 5 Thanks, Cliff -- ================= http://bec-systems.com -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
