On Fri, Feb 23, 2018 at 12:04:51AM +0100, Marcel Ziswiler wrote: > Turns out latest upstream U-Boot does not configure/enable pllu which > leaves it at some default rate of 500 kHz: > > root@apalis-t30:~# cat /sys/kernel/debug/clk/clk_summary | grep pll_u > pll_u 3 3 0 500000 0 > > Of course this won't quite work leading to the following messages: > > [ 6.559593] usb 2-1: new full-speed USB device number 2 using tegra- > ehci > [ 11.759173] usb 2-1: device descriptor read/64, error -110 > [ 27.119453] usb 2-1: device descriptor read/64, error -110 > [ 27.389217] usb 2-1: new full-speed USB device number 3 using tegra- > ehci > [ 32.559454] usb 2-1: device descriptor read/64, error -110 > [ 47.929777] usb 2-1: device descriptor read/64, error -110 > [ 48.049658] usb usb2-port1: attempt power cycle > [ 48.759475] usb 2-1: new full-speed USB device number 4 using tegra- > ehci > [ 59.349457] usb 2-1: device not accepting address 4, error -110 > [ 59.509449] usb 2-1: new full-speed USB device number 5 using tegra- > ehci > [ 70.069457] usb 2-1: device not accepting address 5, error -110 > [ 70.079721] usb usb2-port1: unable to enumerate USB device > > Fix this by actually allowing the rate also being set from within > the Linux kernel. > > Signed-off-by: Marcel Ziswiler <marcel.ziswi...@toradex.com> > > --- > > drivers/clk/tegra/clk-pll.c | 2 ++ > 1 file changed, 2 insertions(+)
I'm aware of the discussion about how best to implement this, but this seems like a reasonable fix until we have something better. Peter, Jon: if you want to fix this more properly, please take point on this. Applied this to for-4.17/clk, thanks. Thierry
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