Michel Dänzer написав(ла):
[...]
>> Is it normal that no interrupts happens from board?
>> or i need more initializing ioctl call to /dev/dri/0 to allow interrupts
>> from hardware?
>
> This is probably due to the DRM_I830_SET_VBLANK_PIPE ioctl - the X
> driver uses it to disable the vblank interrupts while there are no GLX
> clients. This is a crude power saving scheme which will be superseded by
> the infamous DRM vblank-rework, which should work with your code.
Thanks for some explanation, anyway i added more printk's to i915_irq.c
and drm_irq.c
During xorg startup there are:
->drm_irq_install
-> drm_vblank_init
-> i915_enable_interrupt
it successfully install irq and call *i915_enable_interrupt*.
During *drmWaitVBlank* i got next call trace:
drm_wait_vblank
-> drm_vblank_get
->dev->driver->enable_vblank
->i915_enable_vblank: plane=0, pipe=1, pipestat |=
PIPE_VBLANK_INTERRUPT_ENABLE
->i915_enable_irq(00000010)
->drm_update_vblank_count
i915_get_vblank_counter: plane=0, pipe=1, high_frame=00071040,
low_frame=00071044
i also get "enabling vblank interrupts on crtc 0, missed 246"....
It seems to me that IRQ enable, but i have some suspicious about:
[...]
/*
* Older chips didn't have the start vblank interrupt,
* but
*/
if (IS_I965G (dev))
pipestat |= PIPE_START_VBLANK_INTERRUPT_ENABLE;
else
pipestat |= PIPE_VBLANK_INTERRUPT_ENABLE;
[...]
but even if i enable both, /proc/interrupts still shows zeros interrupts
count....
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Maksym Veremeyenko
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