How to use Glamo interrupts
Michael Trimarchi
trimarchi at gandalf.sssup.it
Tue Jun 9 20:37:14 CEST 2009
Hi,
I'm writing the 2d acceleration on android but I need to access the
internal register
of glamo accelerator. It is possible with the drm interface to access
the interal
2d register?
Michael
Andreas Pokorny wrote:
> Hello,
>
> Thank you for your help. We just discovered that the "waits" we had in
> drm-tracking are not really necessary. So right now we do not need the
> interrupt to update the write pointer. Hopefully I will have a debug
> board next time I work on that part.
>
> 2009/6/6 Michael Trimarchi <trimarchi at gandalf.sssup.it>:
>
>> What happen if you ack this irq and you take no lock on cmdq_irq, then arrive another
>> one and you don't mask and mark it pending.
>>
>
> Yes I should have disabled the interrupt...
>
>
>> [...]
>>
>>> glamo_enable_cmdq_irq(gdrm);
>>>
>>>
>> I suppose that here you will do an unmask of the interrupt.
>>
>
> Yes.
>
>
>>> [...]
>>> spin_unlock_irqrestore( &gdrm->new_ring_write_lock, flags );
>>>
>>> /* We try to make the irq happen somehow :( */
>>> printk(KERN_INFO "[glamo-drm] enabling...\n");
>>> glamo_enable_cmdq_irq(gdrm);
>>>
>>>
>> The interrupt is not just umask? So way unmask it again?
>> If you want and interrupt at each new command in the buffer why you don't
>> mask
>> it and ack?
>>
>
> After several trial&error iteratons we had the impression that the
> glamo chip needs to
> be told again that the IRQ for the CMDQ should be triggered..
>
>
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