4.14-stable review patch. If anyone has any objections, please let me know.
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From: Marcel Ziswiler marcel@ziswiler.com
[ Upstream commit c35b518f9ba06c9de79fb3ff62eed7462d804995 ]
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: Marcel Ziswiler marcel.ziswiler@toradex.com Tested-by: Jon Hunter jonathanh@nvidia.com Signed-off-by: Thierry Reding treding@nvidia.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/clk/tegra/clk-pll.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/clk/tegra/clk-pll.c +++ b/drivers/clk/tegra/clk-pll.c @@ -1151,6 +1151,8 @@ static const struct clk_ops tegra_clk_pl .enable = clk_pllu_enable, .disable = clk_pll_disable, .recalc_rate = clk_pll_recalc_rate, + .round_rate = clk_pll_round_rate, + .set_rate = clk_pll_set_rate, };
static int _pll_fixed_mdiv(struct tegra_clk_pll_params *pll_params,