Suspend fails on quickstart / oneiric when using the HDMI daughter board

From dmesg

[ 3334.049960] EXT4-fs (mmcblk0p3): re-mounted. Opts: errors=remount-ro,commit=0
[ 3346.234705] usb 2-1.3: unlink qh8-0e01/d86e1540 start 4 [1/2 us]
[ 3346.925896] PM: Syncing filesystems ... done.
[ 3347.134295] PM: Preparing system for mem sleep
[ 3347.139737] mmc0: card f774 removed
[ 3480.463801] INFO: task mmcqd/0:649 blocked for more than 120 seconds.
[ 3480.470288] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3480.478849] mmcqd/0 D 805c803c 0 649 2 0x00000000
[ 3480.478915] [<805c803c>] (__schedule+0x460/0x4c4) from [<805c817c>] (schedule+0x80/0x84)
[ 3480.478947] [<805c817c>] (schedule+0x80/0x84) from [<80461680>] (__mmc_claim_host+0xc8/0x)
[ 3480.478978] [<80461680>] (__mmc_claim_host+0xc8/0x16c) from [<8046c698>] (mmc_blk_issue_r)
[ 3480.479003] [<8046c698>] (mmc_blk_issue_rq+0x44/0x214) from [<8046d590>] (mmc_queue_threa)
[ 3480.479032] [<8046d590>] (mmc_queue_thread+0xa8/0x10c) from [<80054c98>] (kthread+0xa4/0x)
[ 3480.479064] [<80054c98>] (kthread+0xa4/0xb0) from [<8000ead0>] (kernel_thread_exit+0x0/0x)
[ 3480.479082] no locks held by mmcqd/0/649.
[ 3480.479097] INFO: task jbd2/mmcblk0p3-:820 blocked for more than 120 seconds.
[ 3480.487533] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3480.495622] jbd2/mmcblk0p3- D 805c803c 0 820 2 0x00000000
[ 3480.495661] [<805c803c>] (__schedule+0x460/0x4c4) from [<805c817c>] (schedule+0x80/0x84)
[ 3480.495681] [<805c817c>] (schedule+0x80/0x84) from [<805c81e8>] (io_schedule+0x68/0xa0)
[ 3480.495707] [<805c81e8>] (io_schedule+0x68/0xa0) from [<800b8698>] (sleep_on_page+0x18/0x)
[ 3480.495731] [<800b8698>] (sleep_on_page+0x18/0x20) from [<805c8ac4>] (__wait_on_bit+0x64/)
[ 3480.495752] [<805c8ac4>] (__wait_on_bit+0x64/0xb0) from [<800b8918>] (wait_on_page_bit+0x)
[ 3480.495775] [<800b8918>] (wait_on_page_bit+0xa0/0xb0) from [<800b8f7c>] (filemap_fdatawai)
[ 3480.495798] [<800b8f7c>] (filemap_fdatawait_range+0x78/0x150) from [<800b90d4>] (filemap_)
[ 3480.495829] [<800b90d4>] (filemap_fdatawait+0x80/0x88) from [<801b770c>] (journal_finish_)
[ 3480.495855] [<801b770c>] (journal_finish_inode_data_buffers+0x68/0x164) from [<801b81f4>])
[ 3480.495886] [<801b81f4>] (jbd2_journal_commit_transaction+0x99c/0x13d0) from [<801bd7d0>])
[ 3480.495910] [<801bd7d0>] (kjournald2+0xbc/0x218) from [<80054c98>] (kthread+0xa4/0xb0)
[ 3480.495936] [<80054c98>] (kthread+0xa4/0xb0) from [<8000ead0>] (kernel_thread_exit+0x0/0x)
[ 3480.495951] no locks held by jbd2/mmcblk0p3-/820.
[ 3480.495970] INFO: task flush-179:0:1125 blocked for more than 120 seconds.
[ 3480.502874] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3480.513203] flush-179:0 D 805c803c 0 1125 2 0x00000000 ...

continues to fail on 11.11 RC1

root@linaro-ubuntu-desktop:~# [ 2160.371622] INFO: task mmcqd/0:649 blocked for.
[ 2160.378107] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2160.386603] INFO: task rs:main Q:Reg:1083 blocked for more than 120 seconds.
[ 2160.394838] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2160.403582] INFO: task pm-suspend:2556 blocked for more than 120 seconds.
[ 2160.410401] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2280.421623] INFO: task mmcqd/0:649 blocked for more than 120 seconds.
[ 2280.428108] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2280.436606] INFO: task jbd2/mmcblk0p3-:815 blocked for more than 120 seconds.
[ 2280.445129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2280.453537] INFO: task rs:main Q:Reg:1083 blocked for more than 120 seconds.
[ 2280.460614] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2280.471056] INFO: task pm-suspend:2556 blocked for more than 120 seconds.
[ 2280.480760] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2400.481622] INFO: task mmcqd/0:649 blocked for more than 120 seconds.
[ 2400.488108] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2400.496607] INFO: task jbd2/mmcblk0p3-:815 blocked for more than 120 seconds.
[ 2400.504931] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.
[ 2400.513328] INFO: task rs:main Q:Reg:1083 blocked for more than 120 seconds.
[ 2400.520404] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this.

There are 3 issues with this bug.

1. CONFIG_MMC_UNSAFE_RESUME shall be turned on to allow suspend/resume to work for rootfs on SD card
2. mxc_spdif suspend/resume functions are generating un-necessary kernel warnings
3. soc-audio device could be probed without working codecs, and resume will fail with unbalanced locks

Patches will follow this comment.

I got this bootlog using the new kernel.

It OOPS.

Tested with hwpack_linaro-lt-mx5_20111123-1_armel_supported.tar.gz and it works fine when I'm not using the HDMI daughter card, but it fails to come back from suspend if I'm using the daughter board.

Another interesting behavior is that even if you restart the board when suspending with the daughter board, the monitor will not even start at the next boot (needs a full power cycle to get it to work again).

As the bug happens when using HDMI daughter card, change it back to open and target for next month.