Re: Info Regarding how the Redeon driver access EDID info

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2005-04-06 at 13:46 -0700, karthik wrote:
> Hi,
> 
>           I am not able to understand how the radeon video card  
> driver access EDID info of Monitors attached to the cards.The 
> driver is calling one funtion 
> get_property(dp, propnames[i], NULL);

This is specific to PowerMacs where the EDID is stored there by the
firmware.

> But in this funtion its just return some value ie 
> dp->property->value; how this property->value field is 
> Initialized. Is this get_EDID is called only at boot time. how the value of 
> the device _node structure is initilized.
> 
> If any have any ideas regarding this please mail me.

This is all done by the firmware. radeonfb can also directly get the
EDID from the monitor though via DDC2 (i2c). Look at
drivers/video/aty/radeon_i2c.c and radeon_monitor.c

Ben.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/