[gta04] Meeting minutes for GTA04 discussion 20080411

[Andy Green]

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Somebody in the thread at some point said:
| On Mon, 14 Apr 2008 19:10:11 +0100 Andy Green <andy at openmoko.com> babbled:
|
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|> Somebody in the thread at some point said:
|> | Andy Green wrote:
|> |> ~ - If we see any user interaction with the phone, ie, touchscreen,
|> |> buttons, we always power the LCM backlight and S3C6400 ready to
respond
|> |> to what it is he wanted to do
|> |
|> | Hmm, I'd leave the decision whether to power on the backlight or not
|> | to the CPU. Before the CPU is up, there's nothing useful to display
|> | anyway, and the CPU (application, really) may very well decide not to
|> | bring up the LCM.
|>
|> OK, fair enough.  I guess a button might cause the CPU to make a beep
|> for feedback or something.
|
| the problem is x will bring the screen up the moment it gets any
touchscreen
| interrupts. backlight then must be on and screen will display whatever
contents
| it has. we need to do some mods to x to have backlight controls in x
and then
| leave it entirely to the "screensaver" to decide what to do on wakeup
(when x
| will report the sceensaver/blank has ended).

No worries -- at the time we are talking about the CPU is dead, no power
to the core and no PLLs running.

We're talking about this MPU taking over the duty of scanning the
touchscreen during this time and detecting a touch and coordinating wake
from suspend, specifically if the MPU should start ramping up the
backlight during the time the CPU is resuming.

- -Andy
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