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Date:   Thu, 8 Mar 2018 15:57:43 +0100
From:   Thierry Reding <thierry.reding@gmail.com>
To:     Marcel Ziswiler <marcel@ziswiler.com>
Cc:     linux-tegra@vger.kernel.org, Dmitry Osipenko <digetx@gmail.com>,
        Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Stephen Boyd <sboyd@kernel.org>, linux-kernel@vger.kernel.org,
        Prashant Gaikwad <pgaikwad@nvidia.com>,
        Peter De Schrijver <pdeschrijver@nvidia.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Michael Turquette <mturquette@baylibre.com>,
        linux-clk@vger.kernel.org
Subject: Re: [PATCH] clk: tegra: fix pllu rate configuration
Message-ID: <20180308145743.GK3529@ulmo>
References: <20180222230451.15515-1-marcel@ziswiler.com>
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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:
>=20
> root@apalis-t30:~# cat /sys/kernel/debug/clk/clk_summary | grep pll_u
>        pll_u                  3        3        0      500000          0
>=20
> Of course this won't quite work leading to the following messages:
>=20
> [    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
>=20
> Fix this by actually allowing the rate also being set from within
> the Linux kernel.
>=20
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
>=20
> ---
>=20
>  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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