linux-kernel - Re: [PATCH] ricoh_mmc: Use suspend/resume

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Message-Id: <200811282318.14171.elendil@planet.nl>
Date:	Fri, 28 Nov 2008 23:18:13 +0100
From:	Frans Pop <elendil@...net.nl>
To:	Philip Langdale <philipl@...rt.org>
Cc:	linux kernel <linux-kernel@...r.kernel.org>,
	sdhci-devel@...t.drzeus.cx, Pierre Ossman <drzeus@...eus.cx>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [PATCH] ricoh_mmc: Use suspend/resume_noirq

On Thursday 27 November 2008, Philip Langdale wrote:
> I based this change on top of my previous fix for the new chip but it
> will apply successfully to the original tree. There's still merit in
> considering the quirk idea but this is the simplest fix and it works
> (for my machine, at least :-)

It seems to work for me too.

I also see now what's wrong when I suspend/resume with a partition
mounted: after resume the device appears as /dev/mmcblk1 instead of
the /dev/mmcblk0 it was before suspending and of course that causes
errors when you try to access the mounted partition.

When I suspend/resume without a partition mounted it remains at
/dev/mmcblk0.

I'm not 100% sure this was also the case when I tested Matthew's patch
(I can't remember checking for that), but I would guess so.

With a partition mounted I get during suspend:
pci 0000:00:02.0: PCI INT A disabled
sd 0:0:0:0: [sda] Synchronizing SCSI cache
sd 0:0:0:0: [sda] Stopping disk
ACPI handle has no context!
mmc0: card 8879 removed
MMC: killing requests for dead queue
ACPI handle has no context!
sdhci-pci 0000:02:06.2: PCI INT C disabled
ACPI handle has no context!
ACPI handle has no context!
iwlagn 0000:10:00.0: PCI INT A disabled
[...]
ricoh-mmc: Suspending.
ricoh-mmc: Controller is now re-enabled.

And during resume:
Back to C!
Extended CMOS year: 2000
ricoh-mmc: Resuming.
ricoh-mmc: Controller is now disabled.
Enabling non-boot CPUs ...
[...]
sdhci-pci 0000:02:06.2: restoring config space at offset 0xf (was 0x300, writing 0x30a)
sdhci-pci 0000:02:06.2: restoring config space at offset 0x4 (was 0x0, writing 0xe0102000)
sdhci-pci 0000:02:06.2: restoring config space at offset 0x3 (was 0x800000, writing 0x804010)
sdhci-pci 0000:02:06.2: restoring config space at offset 0x1 (was 0x2100000, writing 0x2100006)
sdhci-pci 0000:02:06.2: PCI INT C -> GSI 20 (level, low) -> IRQ 20
mmc0: new SD card at address 8879
mmcblk1: mmc0:8879 SU02G 1.89 GiB
 mmcblk1: p1 p2 < p5 >

The messages "Controller is now re-enabled/disabled" are a bit confusing
during suspend/resume. Users may well wonder why a controller should get
enabled during suspend...

Feel free to add my:
Tested-by: Frans Pop <elendil@...net.nl>

Cheers,
FJP
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