Hi Vetter:
Do you mean we can just not use drm_irq_install, and make request_irq in
our kernel driver pre-install or post-install interface?
Best Regards.
Yang Shi
PSI,System Integration, SH
E-mail:[email protected]
Tel:88215666-4239
-----Original Message-----
From: Daniel Vetter [mailto:[email protected]] On Behalf Of Daniel Vetter
Sent: Wednesday, September 05, 2012 9:27 PM
To: Liu, Chuansheng
Cc: '[email protected]' ([email protected]);
[email protected]; [email protected]; [email protected];
Shi, Yang A
Subject: Re: [Patch 0/1]drm_irq: Introducing the irq_thread support
On Wed, Sep 05, 2012 at 01:53:44AM +0000, Liu, Chuansheng wrote:
> This patch is for introducing the irq thread support in drm_irq.
>
> Why we need irq thread in drm_irq code?
> In our GPU system, the gpu interrupt handler need some time even > 1ms
> to finish, in that case, the whole system will stay in irq disable status.
> One case is:
> when audio is playing, it sometimes effects the audio quality.
>
> So we have to introduce the irq thread in drm_irq, it can help us move
> some heavy work into irq thread and other irq interrupts can be handled in
> time. Also the IRQF_ONESHOT is helpful for irq thread.
>
> Include one patch:
> [PATCH 01/1] drm_irq-Introducing-the-irq_thread-support
For a kms drm driver (and tbh, doing a non-kms driver today is not a great
idea), there's no reason to use the drm_irq_install/_unistall helpers.
So if you driver has special needs wrt irq handling that don't neatly fit what
the drm_irq stuff provides, simply don't use it - all the generic code that's
there is just to keep non-kms userspace going.
Yours, Daniel
--
Daniel Vetter
Mail: [email protected]
Mobile: +41 (0)79 365 57 48
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