[Intel-gfx] [PATCH V1] drm: export get and put connector type id

Eric Anholt eric at anholt.net
Tue May 26 18:35:10 CEST 2009

On Tue, 2009-05-26 at 11:12 +0800, Ma, Ling wrote:
> >-----Original Message-----
> >From: Eric Anholt [mailto:eric at anholt.net] 
> >Sent: Saturday, May 23, 2009 3:12 AM
> >To: Ma, Ling
> >Cc: dri-devel at lists.sourceforge.net; intel-gfx at lists.freedesktop.org
> >Subject: Re: [Intel-gfx] [PATCH V1] drm: export get and put 
> >connector type id
> >
> >On Fri, 2009-05-22 at 20:15 +0800, Ma Ling wrote:
> >> We use connector type id as sequence to avoid duplicate 
> >connector name.
> >> However for some connectors that advertise multiple functions
> >> we have to meet the same issue, i.e. connector advertise two 
> >functions-
> >> DVI and VGA, actually only VGA is real one, in init function 
> >card0-VGA-1
> >> is allocated for CRT, and card0-DVI-D-1 is allocated for 
> >DVI, but until
> >> detection process complete we could be aware of VGA, not DVI 
> >for this connector,
> >> then we change constructed connector type as VGA, which cause that
> >> the name card0-VGA-1 would be allocated to both a CRT and 
> >that connector.
> >> The patch intends to avoid above case by exporting get and 
> >put connector type id.
> >
> >This whole renaming connectors thing seems broken to me.  Whatever
> >detection is required should be done once at init, and appropriate
> >connectors created.  Is there something preventing that?
> >
> We determin real output by response from sdvocommand.
>  At init if we don't plug any output, the response from sdvo device is 0, 
> so we have to chose real output untile detection complete.

In this case, I think we should expose the maximum reliable information
at init time (even if it means "unknown"), and not change it.  Changing
the connector names at runtime seems bad to me.  It'll only confuse
people and their xrandr scripts.

Eric Anholt
eric at anholt.net                         eric.anholt at intel.com

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