From: Mark Brown <broonie@kernel.org>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, Eric Miao <eric.y.miao@gmail.com>,
Russell King <linux@arm.linux.org.uk>,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Grant Likely <grant.likely@linaro.org>
Subject: Re: [PATCH 2/2] spi/pxa2xx: use a flag to check if the device is runtime suspended
Date: Tue, 18 Jun 2013 19:09:48 +0100 [thread overview]
Message-ID: <20130618180948.GP1403@sirena.org.uk> (raw)
In-Reply-To: <1371565785-31332-2-git-send-email-mika.westerberg@linux.intel.com>
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On Tue, Jun 18, 2013 at 05:29:45PM +0300, Mika Westerberg wrote:
> Current code calls pm_runtime_suspended() in the interrupt handler to check
> if the device is suspended or not. However, runtime PM status of the device
> is only set to suspended once all PM runtime suspend hooks have executed.
> In our case we have the device bound to the ACPI power domain and its
> runtime suspend hook will put the device to D3hot (or D3cold if possible).
> This effectively means that the device is powered off before its state is
> set to runtime suspended. During this time, it might get an interrupt that
> is meant for another device (as the interrupt line is shared), and because
> the device is powered off accessing its registers will return 0xffffffff
> that the driver misinterprets as an invalid state. When this happens user
> will see messages like below on the console:
This sounds like a problem which will affect a lot of devices and hence
ought to be handled better by the PM core or at least frameworks in
general. Is it really device specific?
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next prev parent reply other threads:[~2013-06-18 18:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 14:29 [PATCH 1/2] spi/pxa2xx: use GFP_ATOMIC in sg table allocation Mika Westerberg
2013-06-18 14:29 ` [PATCH 2/2] spi/pxa2xx: use a flag to check if the device is runtime suspended Mika Westerberg
2013-06-18 18:09 ` Mark Brown [this message]
2013-06-19 7:44 ` Mika Westerberg
2013-06-19 9:23 ` Mark Brown
2013-06-19 9:25 ` Russell King - ARM Linux
2013-06-19 9:39 ` Mark Brown
2013-06-19 10:05 ` Russell King - ARM Linux
2013-06-19 11:02 ` Mika Westerberg
2013-06-19 13:59 ` Mark Brown
2013-06-18 18:11 ` [PATCH 1/2] spi/pxa2xx: use GFP_ATOMIC in sg table allocation Mark Brown
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