linux-kernel - Re: [Q] How to tell we're using the KMS (during suspend/resume) outside the graphics driver

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Message-Id: <201003092208.28175.rjw@sisk.pl>
Date:	Tue, 9 Mar 2010 22:08:28 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	James Simmons <jsimmons@...radead.org>
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	dri-devel@...ts.sourceforge.net
Subject: Re: [Q] How to tell we're using the KMS (during suspend/resume) outside the graphics driver

On Tuesday 09 March 2010, James Simmons wrote:
> 
> > > > Second, in the KMS case, we'd be able to skip the kernel VT switch, because
> > > > the KMS driver uses its own framebuffer anyway.
> > > >
> > > > So, is there any reasonable way to check that from the outside of the graphics
> > > > driver?  It should be general enough to cover the cases when there are two
> > > > graphics adapters with different drivers in the system and so forth.
> > > 
> > > Inside the kernel? If you have a struct pci_dev you can get the
> > > associated struct drm_device with pci_get_drvdata and then check the
> > > KMS feature: drm_core_check_feature(dev, DRIVER_MODESET).
> > 
> > Yeah, I know that.
> > 
> > > I'm note sure how to check that a device is graphic card though :|
> > 
> > Well, that's the "outside of the graphics driver" part of my question. :-)
> 
> if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
> 	....

I'm not sure if searching through all PCI devices really is an option.

Thanks anyway.

Rafael
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