short white screen after kernel boots

Andy Green andy at
Fri Oct 31 15:28:41 CET 2008

Hash: SHA1

Somebody in the thread at some point said:
| Hi list,
| There is a short period of white screen after kernel boots.  It is due
| to that the glamo driver is initializing and the backlight is already
| turned on by u-boot:
| ...
| [    0.865000] glamo3362 glamo3362.0: Detected Glamo core 3650
Revision 0002 (49
| -> screen turns white in glamo_init_script
| [    0.905000] glamo3362 glamo3362.0: Glamo core now 49119232Hz CPU /
| [    0.905000] Detected S-Media IRQ# pullup, enabling interrupt
| [    1.005000] glamo-spi-gpio glamo-spi-gpio.0: registering c039bb50:
| [    1.035000] SMEDIA Glamo frame buffer driver (C) 2007 Openmoko, Inc.
| -> screen turns black after glamofb_set_par
| [    1.640000] Console: switching to colour frame buffer device 80x58
| ...
| My idea is to avoid re-initialization if uboot has already done it.  Is
| it sound ok?
| BTW, the glamofb initializes the 4MB memory allocated to it during
| initialization.  It takes about 0.5 seconds.  The attached patch cuts it
| down to 0.1 seconds by only initializing the part used for framebuffer.

The patch sounds good, thanks.

But the problems with white screen on boot are going to be solved a
better way: Qi does not turn on the backlight and when the
balaji-tracking stuff is used the backlight device is a child of the
framebuffer, meaning the backlight will not be initialized until the
framebuffer has been initialized.

- -Andy
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