Re: [PATCH] [media] davinci: vpfe: Add documentation

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Hi Prabhakar,

On Sat, Sep 01, 2012 at 08:23:58PM +0530, Prabhakar Lad wrote:
> On Sat, Sep 1, 2012 at 7:52 PM, Laurent Pinchart
> <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
> > Hi Sakari,
> >
> > On Saturday 01 September 2012 12:57:07 Sakari Ailus wrote:
> >> On Wed, Aug 29, 2012 at 08:11:50PM +0530, Prabhakar Lad wrote:
> >
> > [snip]
> >
> >> > For test pattern you meant control to enable/disable it ?
> >>
> >> There are two approaches I can think of.
> >>
> >> One is a menu control which can be used to choose the test pattern (or
> >> disable it). The control could be standardised but the menu items would have
> >> to be hardware-specific since the test patterns themselves are not
> >> standardised.
> >
> > Agreed. The test patterns themselves are highly hardware-specific.
> >
> > From personal experience with sensors, most devices implement a small, fixed
> > set of test patterns that can be exposed through a menu control. However, some
> > devices also implement more "configurable" test patterns. For instance the
> > MT9V032 can generate horizontal, vertical or diagonal test patterns, or a
> > uniform grey test pattern with a user-configurable value. This would then
> > require two controls.
> >
> two controls I didn't get it ? When we have menu itself with a list of standard
> patterns why would two controls be required ?

Two are not required. A single menu control will do.

-- 
Sakari Ailus
e-mail: sakari.ailus@xxxxxx	XMPP: sailus@xxxxxxxxxxxxxx
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