Re: Re: fbdev cursor part 1.

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

> IIRC, there's a big difference between the number of commands you can queue up
> in the RAGE PRO and earlier chip. Perhaps the queue check always assumes a RAGE
> PRO?
> 
> Hope this helps... (No, I didn't look at the code)

The queue check looks for how many entries are free in the queue
by reading the appropriate register in the chip, I should double
check the specs to see if that's done correctly though (or compare
with X, though I do see some artifacts in X here or there, small
but small drawing errors that let me think that X driver isn't
perfect neither. At least it doesn't lockup).

Here's the code in atyfb:

static inline void wait_for_fifo(u16 entries, const struct atyfb_par *par)
{
	while ((aty_ld_le32(FIFO_STAT, par) & 0xffff) >
	       ((u32) (0x8000 >> entries)));
}

Ben.




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