Re: [linux-fbdev] New api again

[Takashi Oe <to...@un...>]

On 1/17/01 2:33 AM, Geert Uytterhoeven wrote:

> On Tue, 16 Jan 2001, Takashi Oe wrote:
>> Could there be a multiple color version as well?  For 2.4, I have my own
>> fb_set_cmap to do that since a cmap access requires a synchronization with
>> vsync for the first one on my machine, and I don't want to do the
>> synchronization for every cmap change.
>> 
[...]
> Can't you buffer the xxxfb_setcolreg() calls and execute them in the vsync
> interrupt handler? Busy waiting until vsync is a bad idea.

Yes, the vsync irq handler is the way it's done currently for one fb.
Howerver, there is another regrettably more popular fb with the same
requirement without the vsync irq routed to cpu; that is, the busy waiting
seems to be the only way....


Takashi Oe