linux-kernel - Re: Problem with "ARM: tegra: Move tegra_common_init to tegra_init

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Date:	Tue, 22 Feb 2011 20:20:01 -0800
From:	Olof Johansson <olof@...om.net>
To:	Stephen Warren <swarren@...dia.com>
Cc:	"Colin Cross (ccross@...roid.com)" <ccross@...roid.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Russell King - ARM Linux (linux@....linux.org.uk)" 
	<linux@....linux.org.uk>,
	"konkers@...roid.com" <konkers@...roid.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Problem with "ARM: tegra: Move tegra_common_init to tegra_init_early"

Grmbl. I missed the:

[    0.000000] Failed to register IRQ 136 for DMA 0

When I booted the series on harmony and seaboard last night, since the
board came up to prompt and seemed otherwise healthy. Sorry about
that.


-Olof


On Tue, Feb 22, 2011 at 7:12 PM, Stephen Warren <swarren@...dia.com> wrote:
> The following commit makes the Tegra APB DMA engine fail to initialize correctly:
>
> commit 0cf6230af909a86f81907455eca2a5c9b8f68fe6
>
>    ARM: tegra: Move tegra_common_init to tegra_init_early
>
>    Move tegra_common_init to tegra_init_early, and set it
>    as the init_early entry in the machine struct.
>    Initializes the clocks earlier so that timers can enable
>    their clocks.
>
>    Also reorders the members in the Harmony and Trimslice
>    boards' machine structs to match the order they are
>    called in.
>
> The reason is that tegra_init_early_ calls tegra_dma_init which calls
> request_threaded_irq, which fails since the IRQ hasn't yet been marked valid;
> that only happens in tegra_init_irq, which gets called after tegra_init_early.
>
> This used to work OK, since tegra_init_early was tegra_common_init, which got
> called after tegra_init_irq, basically from the beginning of tegra_harmony_init.
>
> I tried moving the call to tegra_dma_init back to each of the very end of
> tegra_init_irq and the very beginning of tegra_harmony_init. Both of these
> resulted in a kernel that wouldn't boot.
>
> Simply removing the call to tegra_dma_init completely does allow the kernel
> to boot, but obviously, DMA isn't available.
>
> I'm a little stumped why moving tegra_dma_init causes a boot failure. Does
> anyone have any helpful ideas, or any alternative ways to fix the underlying
> problem?
>
> Thanks.
>
> --
> nvpublic
>
> --
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