Messages in this thread | | | Date | Thu, 28 Feb 2013 11:10:24 -0700 | From | Stephen Warren <> | Subject | Re: [PATCH] usb: host: tegra: Reset Tegra USB controller before init |
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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 <vbyravarasu@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.
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