On 2009.08.19 10:42:07 -0400, Alan Stern wrote: > On Wed, 19 Aug 2009, Zhenyu Wang wrote: > > > Rafael, as I added this restore long time ago, pci core has changed in some way? > > We had problem when reconfigure agp GTT space in resume, as we must be sure > > gfx device's config space has been restored properly, and as 02:00 gfx device > > restored later than host bridge 00:00 device, that came to my origin patch to > > restore it earlier. > > Why did you do it that way? I mean, why not restore the gfx device's > config space in its own resume routine instead of in the host bridge's > resume routine? > That's the order issue I have mentioned. intel_agp is the pci driver for host bridge (dev 00:00), and drm/i915 is the pci driver for gfx device (dev 00:02). Host bridge will always resume earlier than gfx device, but for intel_agp we need to access gfx device when reconfigure GTT in resume, we can't wait until restore happen in i915 driver. So there might be a conflict here, as i915 driver also do pci_restore_state() after we did reconfigure in intel_agp driver, some configs may be corrupted then. Although I haven't seen it in real testing. -- Open Source Technology Center, Intel ltd. $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
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