linux-kernel - Re: [PATCH] i2c: exynos5: Properly use the "noirq" variants of suspend/resume

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Date:	Thu, 19 Jun 2014 11:43:11 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	javier.martinez@...labora.co.uk, ch.naveen@...sung.com,
	jg1.han@...sung.com, jdelvare@...e.de, sjg@...gle.com,
	paul.gortmaker@...driver.com, standby24x7@...il.com,
	sachin.kamat@...aro.org, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: exynos5: Properly use the "noirq" variants of suspend/resume

Doug Anderson <dianders@...omium.org> writes:

> The original code for the exynos i2c controller registered for the
> "noirq" variants.  However during review feedback it was moved to
> SIMPLE_DEV_PM_OPS without anyone noticing that it meant we were no
> longer actually "noirq" (despite functions named
> exynos5_i2c_suspend_noirq and exynos5_i2c_resume_noirq).
>
> i2c controllers that might have wakeup sources on them seem to need to
> resume at noirq time so that the individual drivers can actually read
> the i2c bus to handle their wakeup.

I suspect usage of the noirq variants pre-dates the existence of the
late/early callbacks in the PM core, but based on the description above,
I suspect what you actually want is the late/early callbacks.

Kevin
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