linux-kernel - Re: [PATCH/RFC 2/2] arm/tegra: add timeout to PCIe PLL lock detection loop

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Date:	Tue, 06 Mar 2012 09:58:50 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Dmitry Artamonow <mad_soft@...ox.ru>
CC:	linux-tegra@...r.kernel.org, Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dia.com>,
	Mike Rapoport <mike@...pulab.co.il>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC 2/2] arm/tegra: add timeout to PCIe PLL lock detection
 loop

On 03/06/2012 01:45 AM, Dmitry Artamonow wrote:
> Tegra PCIe driver waits for PLL to lock using busy loop.
> If PLL fails to lock for some reason, this leads to silent lockup
> while booting (as PCIe code is not modular).
> 
> Fix by adding timeout, so if PLL doesn't lock in a couple
> of seconds, just PCIe driver fails and machine continues to boot.
> 
> Signed-off-by: Dmitry Artamonow <mad_soft@...ox.ru>

That seems reasonable. So once the mdelay discussion is resolved,

Acked-by: Stephen Warren <swarren@...dotorg.org>

Any idea why the PLL doesn't lock sometimes?
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