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:yang.a.shi@intel.com Tel:88215666-4239
-----Original Message----- From: Daniel Vetter [mailto:daniel.vetter@ffwll.ch] On Behalf Of Daniel Vetter Sent: Wednesday, September 05, 2012 9:27 PM To: Liu, Chuansheng Cc: 'linux-kernel@vger.kernel.org' (linux-kernel@vger.kernel.org); dri-devel@lists.freedesktop.org; alexander.deucher@amd.com; airlied@redhat.com; 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: daniel@ffwll.ch Mobile: +41 (0)79 365 57 48