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SubjectRe: [RFC] full suspend/resume support for i915 DRM driver
Date
On Wednesday, October 24, 2007 6:35:14 am Pavel Machek wrote:
> Hi!
>
> > We seem to see a lot of bug reports along the lines of, "my machine
> > resumes but I can't see X" or, "I can see X but only with a bright
> > flashlight", etc. These sorts of problems are due to the fact that
> > the X server isn't designed to do full state save/restore, and none
> > of the available kernel drivers do it on its behalf.
> >
> > Since intelfb and the rest of the Intel drivers are fairly incompatible,
> > this patch makes the DRM bind to the PCI device so it can register real
> > suspend/resume handlers. Those handlers take care of saving and
> > restoring enough state for X to come back reliably on at least one of my
> > problematic test machines, but text mode still has trouble (still
> > debugging VGA state save/restore, including trying to save/restore
> > actual VRAM contents for possible hibernate support).
> >
> > How does this approach look? Is a new DRM driver flag a good thing for
> > similar situations with other drivers? Thoughts?
>
> Looks okay to me... from very quick look.
>
> > + if (!i915_pipe_enabled(dev, pipe))
> > + return;
> > +
> > + if (pipe == PIPE_A)
> > + array = dev_priv->savePaletteA;
>
> coding style, we probably want save_palette_A.

Yeah, I tried not to pull over uglies from the X code but I guess I forgot
this bit. I should also update the copyright.

> > + unsigned long reg = pipe == PIPE_A ? PALETTE_A : PALETTE_B;
>
> Uff. Mixing = and == and ? in one expression is evil.

I could put parens around it if you think that would help, or just move it to
a new line...

> I think I seen some #if 0 code.... just remove that.

Oh I left some in there? Yeah I'll remove it.

Thanks,
Jesse
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