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SubjectRe: [PATCH] DRM / i915: Fix resume regression on MSI Wind U100 w/o KMS
On Fri, 8 Jan 2010 16:01:46 -0800 (PST)
Linus Torvalds <torvalds@linux-foundation.org> wrote:

>
>
> On Sat, 9 Jan 2010, Rafael J. Wysocki wrote:
> >
> > From: Rafael J. Wysocki <rjw@sisk.pl>
> >
> > Commit cbda12d77ea590082edb6d30bd342a67ebc459e0 (drm/i915: implement
> > new pm ops for i915), among other things, removed the .suspend and
> > .resume pointers from the struct drm_driver object in i915_drv.c,
> > which broke resume without KMS on my MSI Wind U100.
> >
> > Fix this by reverting that part of commit cbda12d77ea59.
>
> Hmm. I get the feeling that perhaps the of the drm_driver callbacks
> was very muchintentional, and that the code presumably wants to be
> called purely through the PCI layer, and not through the "drm class"
> logic at all?
>
> Your patch seems like it would always execute the silly class suspend
> even though we explicitly don't want to. And a much nicer fix would
> seem to register the thing properly as a PCI driver even if you don't
> then use KMS.
>
> So it looks to me like the problem is that drm_init() will register
> the driver as a real PCI driver only if
>
> driver->driver_features & DRIVER_MODESET
>
> and otherwise it does that very odd "stealth mode manual scanning"
> thing which doesn't register it as a proper PCI driver.
>
> So could we instead make that "disable KSM" _just_ disable the mode
> setting part, not disable the "I'm a real driver" part?

This is the minimal fix I think (totally untested):

diff --git a/drivers/gpu/drm/i915/i915_drv.c
b/drivers/gpu/drm/i915/i915_drv.c index a0a2cad..1364c3e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -541,6 +541,11 @@ static int __init i915_init(void)
driver.driver_features &= ~DRIVER_MODESET;
#endif

+ if (!(driver.driver_features & DRIVER_MODESET)) {
+ driver.suspend = i915_suspend;
+ driver.resume = i915_resume;
+ }
+
return drm_init(&driver);
}


--
Jesse Barnes, Intel Open Source Technology Center


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