linux-kernel - [PATCH] clk: tegra: fix pllu rate configuration

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Date:   Fri, 23 Feb 2018 00:04:51 +0100
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     linux-tegra@...r.kernel.org
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Marcel Ziswiler <marcel@...wiler.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org
Subject: [PATCH] clk: tegra: fix pllu rate configuration

Turns out latest upstream U-Boot does not configure/enable pllu which
leaves it at some default rate of 500 kHz:

root@...lis-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@...adex.com>

---

 drivers/clk/tegra/clk-pll.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 7c369e21c91c..830d1c87fa7c 100644
--- 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_pllu_ops = {
 	.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,
-- 
2.14.3