Re: [PATCH 2/2] drm/radeon/kms/blit: workaround for a possible hardware bug

On Mit, 2012-02-01 at 11:42 -0500, Ilija Hadzic wrote:

If a blit copy operation specifies a rectangle whose one dimension is 16384 (max allowed by these chips), the chip will silently drop all commands.

What exactly does 'silently drop all commands' mean?

Did you notice the following in i2f():

fraction = (input & 0x3fff) << 10; /* cheat and only handle numbers below 2^^15 */

I suspect that should say 2^14, as 16384 == 0x4000, which results in 0 for the above assignment.