https://github.com/torvalds/linux
Revision 4547be7809a3b775ce750ec7f8b5748954741523 authored by Stanislav Brabec on 02 December 2009, 15:20:56 UTC, committed by Greg Kroah-Hartman on 20 January 2010, 23:03:29 UTC
Perform a tricky suspend/resume even with no_console_suspend. With no_console_suspend, kernel skips serial port suspend/resume and the serial hardware may remain in undefined state after resume. It actually happens on devices that don't have BIOS that handle serial initialization. It makes impossible to use serial console after resume. Devices affected by this problem include: Sharp Zaurus devices Several PXA based ARM embedded boards The patch does: - Save the hardware state - Perform buffer flush in time of its suspend call - Tell the driver that port is suspended - But still accept new data - And keep console hardware in state that allows to send them It allows to capture late console messages without breaking console after resume. This is just a resend of a patch discussed in these threads, as the patch was not yet applied. "Possible suspend/resume regression in .32-rc?" (Nov 1-5, 2009, ARM list, later LKML) "serial-core: resume serial hardware with no_console_suspend" (Sep 15-Oct 18, 2009, LKML & ARM lists) Signed-off-by: Stanislav Brabec <sbrabec@suse.cz> Tested-by: Haojian Zhuang <haojian.zhuang@gmail.com> Tested-by: Daniel Mack <daniel@caiaq.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 parent 6d34855
Tip revision: 4547be7809a3b775ce750ec7f8b5748954741523 authored by Stanislav Brabec on 02 December 2009, 15:20:56 UTC
serial-core: resume serial hardware with no_console_suspend
serial-core: resume serial hardware with no_console_suspend
Tip revision: 4547be7
File | Mode | Size |
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Documentation | ||
arch | ||
block | ||
crypto | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.gitignore | -rw-r--r-- | 843 bytes |
.mailmap | -rw-r--r-- | 3.9 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 91.8 KB |
Kbuild | -rw-r--r-- | 2.4 KB |
MAINTAINERS | -rw-r--r-- | 160.2 KB |
Makefile | -rw-r--r-- | 52.0 KB |
README | -rw-r--r-- | 17.0 KB |
REPORTING-BUGS | -rw-r--r-- | 3.3 KB |
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