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authorBarry Song <baohua.song@csr.com>2011-10-06 20:34:46 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-10-16 23:30:36 +0200
commit6f8d7022a842809aeb24db1d15669198ef02c131 (patch)
treeae1d4bacda83b3f430c644cf2479ffb1948bb30c /Documentation/kernel-parameters.txt
parent21e82808fc465b66fedaac0f4e885cafb304e843 (diff)
PM / Hibernate: Add resumewait param to support MMC-like devices as resume file
Some devices like MMC are async detected very slow. For example, drivers/mmc/host/sdhci.c launches a 200ms delayed work to detect MMC partitions then add disk. We have wait_for_device_probe() and scsi_complete_async_scans() before calling swsusp_check(), but it is not enough to wait for MMC. This patch adds resumewait kernel param just like rootwait so that we have enough time to wait until MMC is ready. The difference is that we wait for resume partition whereas rootwait waits for rootfs partition (which may be on a different device). This patch will make hibernation support many embedded products without SCSI devices, but with devices like MMC. [rjw: Modified the changelog slightly.] Signed-off-by: Barry Song <Baohua.Song@csr.com> Reviewed-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 854ed5ca7e3f..88a7b197a4eb 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2240,6 +2240,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
in <PAGE_SIZE> units (needed only for swap files).
See Documentation/power/swsusp-and-swap-files.txt
+ resumewait [HIBERNATION] Wait (indefinitely) for resume device to show up.
+ Useful for devices that are detected asynchronously
+ (e.g. USB and MMC devices).
+
hibernate= [HIBERNATION]
noresume Don't check if there's a hibernation image
present during boot.