Re: siliconmotion CSync output ?

On Thu, 22 Feb 2007, bruno schwander wrote:

> A little background: I have a single board PC with a SMI712 (lynxEM+) 
> graphic chipset. X works like a charm.

> I now need to hook up an LCD panel that has an RGB interface, but only takes 
> composite sync (CSync) input (not H and V sync).

> The SMI chipset can generate composite sync, I see in the SMI spec that 
> setting the register CCR65, bit 0 to 0, outputs Hsync for the CRT. Setting 
> to 1 outputs composite sync on the same pin.

> So what I want to know, is how can I make sure this is supported ?

> I see in the Xconfig.conf man page that I can specify 'composite' on the 
> modeline to generate composite sync on hardware that supports it. Where is 
> that handled ? How can I make sure this setting is passed down to the 
> siliconmotion driver and it sets the register appropriately ? I looked 
> through the sources of siliconmotion_drv but I can not find anything about 
> setting that register.

The driver currently ignores the V_CSYNC mode flag, so you would need to come 
up with a source patch to change that.

Marc.

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