[PATCH] fix-suspend-backlight-timing-pm-debug.patch

Andy Green andy at openmoko.com
Thu May 8 15:05:14 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
| This patch improves the smoothness of suspend and resume action.
| Taking out CONFIG_PM_DEBUG allows much more rapid resume (the low level
| serial traffic appears to be synchronous)
| Added a platform callback in jbt driver and support in pcf50633 so we
| can defer bringing up the backlight until the LCM is able to process
| video again (which must happen after the glamo is up and producing
| video beacuse the LCM is hooked to glamo SPI)
| GTA01 should not be affected by all this as the callback will default
| to null and it is on pcf50606

If you're interested to try this, it's on andy branch, but you have to
take care to use either defconfig-2.6.24 from that tree or to make sure
you dd the following to your config

+# CONFIG_S3C2410_PM_DEBUG is not set

+# CONFIG_DEBUG_LL is not set

The lowlevel debug stuff being synchronous is what is eating the vast
chunks of time on resume.

I tested it only on text console where it is much nicer and faster, I
don't know what interactions will occur with whatever thinks it needs to
meddle with things on resume when X is up.

- -Andy
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