Re: [PATCH] Kconfig: disable Media Controller for DVB

[Mauro Carvalho Chehab <mchehab@osg.samsung.com>]

Em Fri, 12 Jun 2015 13:02:00 +0200
Hans Verkuil <hverkuil@xs4all.nl> escreveu:

> On 06/12/2015 12:57 PM, Mauro Carvalho Chehab wrote:
> > Since when we start discussions about the usage Media Controller
> > for complex hardware, one thing become clear: the way it is, MC
> > fails to map anything more complex than a webcam.
> > 
> > The point is that MC has entities named as devnodes, but the only
> > devnode used (before the DVB patches) is MEDIA_ENT_T_DEVNODE_V4L.
> > Due to the way MC got implemented, however, this entity actually
> > doesn't represent the devnode, but the hardware I/O engine that
> > receives data via DMA.
> > 
> > By coincidence, such DMA is associated with the V4L device node
> > on webcam hardware, but this is not true even for other V4L2
> > devices. For example, on USB hardware, the DMA is done via the
> > USB controller. The data passes though a in-kernel filter that
> > strips off the URB headers. Other V4L2 devices like radio may not
> > even have DMA. When it have, the DMA is done via ALSA, and not
> > via the V4L devnode.
> > 
> > In other words, MC is broken as a hole, but tagging it as BROKEN
> 
> hole -> whole
> 
> One of these days you'll have retrained your brain for this :-)

Heh ;)

> 
> > right now would do more harm than good.
> > 
> > So, instead, let's mark, for now, the DVB part as broken and
> > block all new changes to it while we don't fix this mess, with
> 
> "while we fix this mess, which"

Changed to:
   "block all new changes to MC while we fix this mess, which"


Sending version 2.

Regards,
Mauro