From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Stuvart S <lovelinuxdeeply@gmail.com>
Cc: linux-renesas-soc@vger.kernel.org
Subject: Re: About Rcar Du
Date: Thu, 19 Jan 2017 14:42 +0200 [thread overview]
Message-ID: <2727959.pNfnb7DPey@avalon> (raw)
In-Reply-To: <CAAMGra4bptV2sNXoLPP9xRBmR+OiO=JqmqTfPtiSCiWudLPpoA@mail.gmail.com>
Hello Stuvart,
On Thursday 19 Jan 2017 09:43:16 Stuvart S wrote:
> On Thu, Jan 19, 2017 at 2:44 PM Laurent Pinchart wrote:
> > On Thursday 19 Jan 2017 08:24:38 Stuvart S wrote:
> >> Hi Laurent and all,
> >>
> >> I would like to ask a very basic question here .. I have an Rcar E2
> >> board with me..Linux 4.8 version kernel is running perfectly on this
> >> board.. Now I am getting videos on HDMI output.. I would like to modify
> >> this video by tapping from du unit and rescale that video .. I found
> >> that many du output source code are there in driver/gpu/drm/rcar-du ..I
> >> dont know which of these that I have to edit.. Am I able to take video/
> >> image data from du? I am a newbi in this field ..
> >
> > The DU doesn't have any scaler, you will need to use an external scaler,
> > such as the one included in the VSP (using OpenGL for scaling is also an
> > option if you have support for the GPU). No kernel modification is needed
> > for this, the DU and VSP are both supported in mainline with a DRM/KMS and
> > V4L2 driver respectively.
>
> Thank you so much . I understand.. But here I am trying to ask about data
> tapping from DU .. I cant see any data flow through DU source code ..which
> area that I have to focus to do so.. Normally many DU outputs are there
> like lvds,hdmi etc.. Here I would like to try to take the data at just
> before output port
Do you mean capturing the frames to memory ? The DU supports write-back, but
there's no software support for it on R-Car Gen2 at the moment.
> I dont know wether it is a meaningless question ..
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2017-01-19 13:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAAMGra4__ZZWocyP=Yyhgz=8Xb_aDyuEKAn_3+X54Wp0oKwmAQ@mail.gmail.com>
2017-01-19 9:15 ` About Rcar Du Laurent Pinchart
[not found] ` <CAAMGra4bptV2sNXoLPP9xRBmR+OiO=JqmqTfPtiSCiWudLPpoA@mail.gmail.com>
2017-01-19 12:42 ` Laurent Pinchart [this message]
2017-01-19 17:36 ` Stuvart S
2017-01-19 18:37 ` Laurent Pinchart
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