iMX6SL Suspend mode (S3)

[John Tobias]

Thanks Russell. Got it working.

Regards,

john

On Fri, Jan 24, 2014 at 1:24 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Fri, Jan 24, 2014 at 01:14:08PM -0800, John Tobias wrote:
>> Hello all,
>>
>> I am testing the suspend mode (S3) for my custom board with iMX6SL and
>> the iMX6SL EVK as well. I am using 3.13 kernel, eMMC and MMC for the
>> storage and systemd to control the OS. If I put my device in S3 mode,
>> I got the following messages:
>>
>> [   27.949393] PM: Syncing filesystems ... done.
>> [   27.972392] mmc0: card 0001 removed
>> [   28.033613] end_request: I/O error, dev mmcblk0, sector 0
>> [   28.063493] end_request: I/O error, dev mmcblk0, sector 0
>> [   28.107933] end_request: I/O error, dev mmcblk0, sector 0
>> [   28.131456] end_request: I/O error, dev mmcblk0, sector 0
>> [   28.153651] end_request: I/O error, dev mmcblk0, sector 0
>> [   28.215530] Freezing user space processes ... (elapsed 0.001 seconds) done.
>> [   28.224284] Freezing remaining freezable tasks ... (elapsed 0.001
>> seconds) done.
>> [   28.233658] Suspending console(s) (use no_console_suspend to debug)
>>
>> If I press any key, it will wake up. But, I got the following errors:
>>
>> [   17.815008] mmc0: new high speed DDR MMC card at address 0001
>> [   17.828024] mmcblk0: mmc0:0001 SEM04G 3.68 GiB
>> [   17.833522] mmcblk0boot0: mmc0:0001 SEM04G partition 1 2.00 MiB
>> [   17.839699] mmcblk0boot1: mmc0:0001 SEM04G partition 2 2.00 MiB
>> [   17.847150] mmcblk0rpmb: mmc0:0001 SEM04G partition 3 2.00 MiB
>> [   17.860116]  mmcblk0: p1 p2 p3 p4 < p5 p6 >
>> [   17.883550]  mmcblk0boot1: unknown partition table
>> [   17.899549]  mmcblk0boot0: unknown partition table
>
> This is because MMC insists that when you suspend, the card will be
> ejected, and when you resume, it will be re-inserted - it's effectively
> the same as if you pulled the card out and then plugged it back in
> without shutting the system down.
>
> This is the default for the MMC subsystem, unless MMC_UNSAFE_RESUME
> is set - and you can't have rootfs in MMC and suspend/resume unless
> that's set.
>
> --
> FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
> in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
> Estimate before purchase was "up to 13.2Mbit".