linux-kernel - Re: [PATCH] ARM: OMAP2+: hwmod: Fix _wait_target

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Date:	Tue, 13 Jan 2015 23:29:32 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Suman Anna <s-anna@...com>
cc:	Lokesh Vutla <lokeshvutla@...com>, Roger Quadros <rogerq@...com>,
	tony@...mide.com, santosh.shilimkar@...cle.com, t-kristo@...com,
	nm@...com, nsekhar@...com, bcousson@...libre.com,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: OMAP2+: hwmod: Fix _wait_target_ready() for hwmods
 without sysc

Hi Suman,

thanks for pitching in on this!

On Tue, 6 Jan 2015, Suman Anna wrote:

> You have removed the return from the above block on failure. If any DT
> entry doesn't have the reg property, this will hang the kernel boot.
> Just remove the "reg" entry from any of the existing DT, and you will
> run into the issue, this is what 6423d6df1440 ("ARM: OMAP2+: hwmod:
> check for module address space during init") fixed. 

Seems like that's the problem that we need to track down, then.  If a 
hwmod has no MPU-accessible registers, it should still be possible to 
init the clocks for the device, etc. ...

> Also, are you sure you want to turn the WARN into a pr_debug, it won't 
> even show during the kernel boot log if the reg base is missing.

No, I'm not sure :-)  I guess it depends how many hwmods we'll have with 
no MPU-accessible registers.  We don't seem to have address ranges for the 
interconnects defined; we could fix that fairly easily. 


- Paul
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