linux-kernel - Re: [PATCH RESEND] clk: tegra30: Don't wait for PLL

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Message-ID: <520E5583.2080604@wwwdotorg.org>
Date:	Fri, 16 Aug 2013 10:38:27 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
CC:	mturquette@...aro.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	pgaikwad@...dia.com, pdeschrijver@...dia.com
Subject: Re: [PATCH RESEND] clk: tegra30: Don't wait for PLL_U lock bit

On 08/14/2013 02:09 PM, Tuomas Tynkkynen wrote:
> The lock bit on PLL_U does not seem to be working correctly and
> sometimes never gets set when waiting for the PLL to come up.
> Remove the TEGRA_PLL_USE_LOCK flag to use a constant delay.

Tested-by: Stephen Warren <swarren@...dia.com>
Acked-by: Stephen Warren <swarren@...dia.com>

(Mike I assume you'll take this through the clock tree)

I do suspect there's some underlying issue that needs fixing so that
PLL_U does report lock as expected. However, this fix does enable USB to
work correctly on Tegra30 right now (so I assume it is locking, but just
isn't reporting it), and should have zero negative fallout since nothing
else uses PLL_U. I'm following up internally to work out why the PLL
isn't reporting that it's locking as expected.
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