Messages in this thread | | | Date | Tue, 19 Mar 2013 12:14:39 -0700 | 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 | From | Yinghai Lu <> |
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On Tue, Mar 19, 2013 at 9:54 AM, Daniel Vetter <daniel.vetter@ffwll.ch> 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);
Thanks
Yinghai
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