linux-kernel - Re: [PATCHv5 06/15] hwspinlock/omap: enable module before reading SYSSTATUS register

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Message-ID: <CAK=WgbaKPgLLw-4wCSToE86QrREDB0sK95TLx2y17d71eBPFbg@mail.gmail.com>
Date:	Tue, 1 Jul 2014 15:51:27 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Suman Anna <s-anna@...com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Bjorn Andersson <bjorn@...o.se>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv5 06/15] hwspinlock/omap: enable module before reading
 SYSSTATUS register

Hi Suman,

On Thu, May 1, 2014 at 3:34 AM, Suman Anna <s-anna@...com> wrote:
> The number of hwspinlocks are determined based on the value read
> from the IP block's SYSSTATUS register. However, the module may
> not be enabled and clocked, and the read may result in a bus error.
>
> This particular issue is seen rather easily on AM33XX, since the
> module wakeup is software controlled, and it is disabled out of
> reset. Make sure the module is enabled and clocked before reading
> the SYSSTATUS register.

This seems like a valid fix that is independent of this patch series.

Feel free to submit it separately if you want, so we can get it merged.

Thanks,
Ohad.
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