How to access a DRM CRTC's scan out buffer?

[Peter Teoh]

As indicated here:

http://www.botchco.com/agd5f/?p=51

the input to CRTC is the framebuffer, and output of CRTC is already
monitor-level information...which is meaningless to you.   So but best bet
is to get it at the framebuffer level?

Correct me if wrong?


On Thu, Jan 16, 2014 at 8:06 PM, Sannu K <sannumail4foss at gmail.com> wrote:

> On Thu, Jan 16, 2014 at 1:14 PM, Peter Teoh <htmldeveloper at gmail.com>wrote:
>
>> In general how it worked is explained here:
>>
>> https://www.kernel.org/doc/htmldocs/drm/drm-kms-init.html
>>
>> Not sure which is the name of your video card, but I think in general all
>> the page flip API should have access to the scan buffer (see link above).
>> For Intel these are possible APIs
>>  :
>>
>>
> Thanks. I was trying to find out a generic way to access the scan out
> buffer. The page flip functions looks specific to hardware.
>
>
>>
>> static void do_intel_finish_page_flip(struct drm_device *dev,
>> void intel_finish_page_flip(struct drm_device *dev, int pipe)
>> do_intel_finish_page_flip(dev, crtc);
>> void intel_finish_page_flip_plane(struct drm_device *dev, int plane)
>> do_intel_finish_page_flip(dev, crtc);
>> void intel_prepare_page_flip(struct drm_device *dev, int plane)
>>  * is also accompanied by a spurious intel_prepare_page_flip().
>> inline static void intel_mark_page_flip_active(struct intel_crtc
>> *intel_crtc)
>>
>> --
>> Regards,
>> Peter Teoh
>>
>
> It is enough to have a way to get the content of scan out buffer instead
> of accessing it directly using a pointer.
>
> Thanks for you help,
> Sannu K
>



-- 
Regards,
Peter Teoh
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20140117/f78ae4f5/attachment.html