On 02/28/2013 08:09 AM, Alan Stern wrote: > On Thu, 28 Feb 2013, Venu Byravarasu wrote: > >> To clear any configurations made by U-Boot on Tegra USB controller, >> reset it before init in probe. >> >> Signed-off-by: Venu Byravarasu <vbyravar...@nvidia.com> >> --- >> When U-Boot configures a Tegra USB controller in device mode and if the EHCI >> driver of kernel tries to set it to HOST mode, message "irq 52: nobody cared" >> appears and IRQ gets disabled. >> >> This issue was initially reported with: >> http://marc.info/?l=linux-tegra&m=136110175423601&w=2 >> >> To avoid such issues, due to configurations made by U-Boot driver, reset the >> Tegra USB controller, before configuring it by kernel. > > Does the Tegra platform use shared interrupts? If it does, what > happens if the IRQ is enabled and in use by another device before > ehci-tegra resets the USB controller?
I believe there's a dedicated interrupt just for each individual controller. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
