[PATCH RFC 0/8] Add New DRM Driver for Hisilicon's Hi6220 SoC

[Xinliang Liu]

On 17 September 2015 at 04:16, Daniel Vetter <daniel at ffwll.ch> wrote:

> On Wed, Sep 16, 2015 at 04:23:35PM +0100, Daniel Stone wrote:
> > The biggest issue though, is that this driver should become an atomic
> > modesetting driver. Atomic modesetting, rather than sending small
> > individual commands (enable CRTC, change plane position, etc) is based
> > on validating and passing around complete sets of hardware state.
> > Daniel Vetter's blog has an article on how to convert your driver:
> > http://blog.ffwll.ch/2014/11/atomic-modeset-support-for-kms-drivers.html
>
> Yeah, any new driver should really be built on top of atomic - it's a lot
> more flexible than the old thing and it's also what you want long-term.
>
> I've also just done a presenation about atomic for drivers:
>
> http://people.freedesktop.org/~danvet/presentations/xdc-2015.pdf


Hi Daniel,
This is a good presentation. It gives us very detail and good suggection on
implementation.
Thank you for sharing this.

We have a open source KMS hwc:
wiki:
https://wiki.linaro.org/BenjaminGaignard/HWComposer_DRM?highlight=%28hwcomposer%2
source code: git://git.linaro.org/people/benjamin.gaignard/hwcomposer.git
Now only STI and Hikey boards are tested on it. And atomic mode setting is
not support now.
I think we should add support for atomic mode setting next.

One difficulty I am facing is that one setting should be made sure is ok in
the prepare function of hwc.
If not, the set function of hwc may be fail and display will not properly.
I don't know atomic mode setting how to handle this situation. And it seems
that in the prepare function,
it should check the hardware's capabilities, such as clip, scale, rotation,
blending and so on.

Thanks,
-Xinliang

>
>
> Cheers, Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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