On 12/29/2010 10:35 AM, Maarten Maathuis wrote:
I found these by simply dumping the entire range modesetting related
registers. At the time they didn't help me (the issue of swapbuffers
remains unsolved on this generation of hardware, it didn't interest me
*that* much). I don't know what exactly you are doing, but a lot of
stuff is done through pushbuffers (even modesetting) so there are no
"instant" registers that i know of.
Oh, it's about precisely timestamping when a scanout starts (at end of
vblank) and when exactly a bufferswap completed - when the post-swap
frontbuffer starts to scan out. This commit gives the background info:
<http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=27641c3f003e7f3b6585c01d8a788883603eb262>
This is what it looks like in the i915 kms, to be implemented very
similar in nouveau kms:
<http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commit;h=0af7e4dff50454905092d468e91c1ef92e10e6b4>
-mario
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