[PATCH v2 12/12] JUST FOR TEST: Add one-shot trigger to update display

[Mark Zhang]

On 07/01/2015 06:34 PM, Daniel Vetter wrote:
> On Wed, Jul 01, 2015 at 05:01:52PM +0800, Mark Zhang wrote:
>> On 07/01/2015 04:36 PM, Daniel Vetter wrote:
>>> On Wed, Jul 01, 2015 at 04:21:55PM +0800, Mark Zhang wrote:
>>>> This HACK adds a workqueue to refresh the display periodically.
>>>> This is used just for testing.
>>>
>>> ->dirty is the drm hook you're looking for, it's meant to flush out any
>>> frontbuffer rendering. Generic kms clients using the dumb buffers (e.g.
>>> fedora boot splash) use this already.
>>>
>>
>> Oh... I did a grep in drm source and are you talking about
>> "drm_framebuffer_funcs->dirty"? Yeah, that should work for me.. but that
>> requires userspace sending IOCTL to trigger, right? Honestly I'm lazy so
>> I created this HACK so that I don't need userspace to test.
> 
> Yeah userspace needs to send ioctl already after each drawing. Generic
> userspace does that already since it's required by qxl, udl, soon i915 and
> probably a few others too. fbdev emulation is more annyoing but there's
> code to move around in these drivers (qxl seems best to me as a starting
> point) too.
> 

Alright, this makes sense. I have no idea about qxl, what I have now is
an ubuntu running on Tegra114. So I'm wondering what I suppose to do is
installing qemu on the ubuntu?

Mark

> Imo without this you shouldn't merge one-shot, at least not enabled by
> default.
> -Daniel
>