* Info Regarding how the Redeon driver access EDID info
@ 2005-04-06 20:46 karthik
2005-04-06 8:10 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 2+ messages in thread
From: karthik @ 2005-04-06 20:46 UTC (permalink / raw)
To: linux-kernel
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);
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.
Karthik
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: Info Regarding how the Redeon driver access EDID info
2005-04-06 20:46 Info Regarding how the Redeon driver access EDID info karthik
@ 2005-04-06 8:10 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 2+ messages in thread
From: Benjamin Herrenschmidt @ 2005-04-06 8:10 UTC (permalink / raw)
To: karthik; +Cc: Linux Kernel list
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-04-06 8:11 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-04-06 20:46 Info Regarding how the Redeon driver access EDID info karthik
2005-04-06 8:10 ` Benjamin Herrenschmidt
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®