[PATCH] drm: reduce default drm vblank off delay to 50ms

[Stéphane Marchesin]

On Tue, Oct 30, 2012 at 12:20 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Tue, Oct 30, 2012 at 8:09 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
>> People keep whining about this, but no one seems to send a patch.  This
>> *ought* to be safe now that we've dealt with the hw races in Mario's
>> updated code, and fixed the bugs we know about in VT switch, DPMS, and
>> multi-head configuraions.
>>
>> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
>
> Afaik the fundamental race of enabling the vblank is still there, so
> this is just duct-tape. And our hw has the required registers (on
> gen5+ at least) to close this race for real and abolish all "disable
> vblank irq later to paper over races and smooth things out). Hence I
> think we should dtrt and so

[digging an old thread]

So I'm looking at this machine where we can't get good PSR residency
because the vblank_offdelay is so long. Therefore, I'm suddenly very
interested in solving this issue :) Of course I can't seem to find
logs of the fun IRC discussion you guys had, can you describe what the
race is, and also what are the registers you're talking about?

Stéphane


>
> Nacked-by: Daniel Vetter <daniel at ffwll.ch>
>
> Also discussed with Jesse on irc, we've had fun ;-)
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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