Messages in this thread Patch in this message | | | Date | Thu, 21 Mar 2013 00:14:22 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: gm45 intel gfx can generate non-MSI irq# in MSI mode (was Re: [PATCH] drm/i915: stop using GMBUS IRQs on Gen4 chips (was Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses |
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On Tue, 19 Mar 2013, Yinghai Lu wrote:
> > I guess I should have phrased it more precisely, but that's exactly > > what I expect is happening on my machine: I don't have anything on > > irq16 (i.e. in non-msi mode the gfx interrupt isn't shared) and hence > > the irq is completely disabled. Which obviously makes it impossible > > for me to reproduce the issue. To test that theory, is there a quick > > way to force-enable a given interrupt, short of just hacking up a 2nd > > dummy irq handler in my driver? > > You may try to add another request_irq() > after i915_load_modeset_init==>drm_irq_install. > That could install one dummy action for ioapic irq for i915. > > Also you may need to add one quirk that does not disable intx during > msi enabling like: > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, > 0x2e22, > quirk_msi_intx_disable_bug); >
This seemed to be really promising idea to me, as the DisINTx+ vs INTx+ discrepancy is very good hint, but unfortunately, after applying this:
--- drivers/pci/quirks.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 0369fb6..8508e24 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2643,6 +2643,9 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0x1073, quirk_msi_intx_disable_bug); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0x1083, quirk_msi_intx_disable_bug); + +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x2a42, + quirk_msi_intx_disable_bug); #endif /* CONFIG_PCI_MSI */ /* Allow manual resource allocation for PCI hotplug bridges
The problem is still there ... so the inconsistency between DisINTx+ and INTx+ is unfortunately not the whole story.
-- Jiri Kosina SUSE Labs
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