On 01/09/11 20:08, Stephen Warren wrote: > Marc Dietich wrote at Thursday, September 01, 2011 5:14 AM: >> I'll add Stephen Warren from NVIDIA to the CC list. He has more HW to test on. > > Here are the results I found: > > Harmony: > Tegra USB3 -> SMSC9514 hub: NOT affected > (Unplugging LAN cable, or disabling SMSC9514 LAN driver doesn't change this) > > Seaboard (springbank; clamshell): > Tegra USB1 -> no hub: Affected > > Seaboard (seaboard non-clamshell): > Tegra USB1 -> no hub: Affected > Tegra USB3 -> no hub: Affected > > TrimSlice: > Tegra USB3 -> unknown hub: Affected > > This implies there's something different about Harmony. > > Is the USB hub a clue? Seaboard doesn't have one, and although I don't > know what model TrimSlice uses, I assume it's different since I know > TrimSlice's Ethernet is not the same as Harmony's. Panda has the exact same USB hub configuration, and is affected. So we can rule this out. > I don't see anything in board-harmony.c vs. board-seaboard.c that'd affect > anything USB-related. > > Perhaps there's some kind of bootloader or BCT difference. However, my > Harmony and both Seaboards both use (a very old) U-Boot and BCT from > ChromeOS, so I don't imagine there's actually much difference there. I just noticed something else. Harmony is fast *most of the time*. In about one in 3 reboots, I get the slow behavior. When USB is fast, I also have I2C interrupts "screaming": 85: 294321 0 GIC tegra-i2c 116: 0 0 GIC tegra-i2c 118: 98542 0 GIC tps6586x This is a couple of seconds after boot. When USB is slow, I see the following: [ 0.385270] tps6586x 3-0034: Chip ID read failed: -121 [ 0.390584] tps6586x: probe of 3-0034 failed with error -5 ... and I2C interrupt is quiet. The I2C interrupt handler calls writel(), which does a cache sync. That would explain the "fast" behavior of Harmony. Do you see the same this on your board? M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
