• Marcel Ziswiler's avatar
    clk: tegra: Fix pll_u rate configuration · c35b518f
    Marcel Ziswiler authored
    Turns out latest upstream U-Boot does not configure/enable pll_u 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: default avatarMarcel Ziswiler <marcel.ziswiler@toradex.com>
    Tested-by: default avatarJon Hunter <jonathanh@nvidia.com>
    Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
    c35b518f
clk-pll.c 69.3 KB