Am 25.11.2013 16:23, schrieb Daniel Vetter:
On Mon, Nov 25, 2013 at 04:14:12PM +0100, Thomas Richter wrote:
Hi Daniel, hi group,
just being curious - what is the status of the i830 watermark
problems, i.e. the state of affairs
concerning that the i830 does not allow the maximum watermark value,
but requires a "headroom" of eight entries to
avoid flickering.
I provided a patch for this a while ago, but this seems to go
nowhere. Just to remind you: The current code does not create
a stable image on i830 based devices, even if only an internal
display is connected.
I provided two possible attacks to the problem: A quick and dirty
method which checks for the maximum value for
i830 manually, or an overall solution which adds a "minimum"
watermark value for all supported chipsets.
Please let me know how to proceed.
I seem to be too swamped with firedrills and bugs atm to get the polished
version in. The problem with just a quick hack is that we still need to
switch i830M to the dual-pipe watermark function, and somehow my patch to
do so seems to be broken. At least you've said that the kernel still seems
to hit the single-watermark version of the function.
So atm I'm a bit stalled on this :( But if you can track this down I'd go
with a quick hack to enforce the minimum of 8 or so in the dual-pipe
watermark function shared by gen2/3.
Not a problem on my side, but it would be a "bad thing"(tm) to release a
kernel that leaves a i830 based
architecture essentially non-usable. Well, if you depend on a local
display, that is. (-;
Greetings,
Thomas
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