From: Jon Smirl <jonsmirl@gmail.com>
To: linux-fbdev-devel@lists.sourceforge.net
Subject: Re: [patch] radeonfb: FB_WAITFORVSYNC implementation
Date: Sat, 12 Mar 2005 10:33:45 -0500 [thread overview]
Message-ID: <9e473391050312073314dcb39f@mail.gmail.com> (raw)
In-Reply-To: <1110636406.5997.86.camel@atlantis.netenviron.com>
You can't do this without coordination from X and DRM. If either of
those are in use you will lock the machine with this patch. DRM also
implements WAITFORVSYNC as well as other interrupts. If you clear the
ISR DRM is going to stop working.
X is a bigger problem. If the radeonfb adapter is not the primary X
adapter, X is going to disable its IO/MEM access at the PCI level on
VT switch. Your radeonfb will then take an interrupt and not be able
to acknowledge it. This results in an interrupt loop and you rebooting
your machine.
See the "Who is stomping PCI config space?" thread in the x.org xserver list.
Because of these issues WAITFORVSYNC in radeondb has to wait for
merged DRM/fbdev to be implemented.
--
Jon Smirl
jonsmirl@gmail.com
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next prev parent reply other threads:[~2005-03-12 15:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-12 14:06 [patch] radeonfb: FB_WAITFORVSYNC implementation Torgeir Veimo
2005-03-12 15:13 ` Ville Syrjälä
2005-03-12 16:59 ` Torgeir Veimo
2005-03-12 17:10 ` Michel Dänzer
2005-03-12 17:12 ` Torgeir Veimo
2005-03-12 19:20 ` Michel Dänzer
2005-03-12 19:35 ` Jon Smirl
2005-03-12 23:33 ` Benjamin Herrenschmidt
2005-03-12 17:33 ` Ville Syrjälä
2005-03-16 1:28 ` Torgeir Veimo
2005-03-16 1:59 ` Ville Syrjälä
2005-03-16 6:19 ` Michel Dänzer
2005-03-12 15:33 ` Jon Smirl [this message]
2005-03-12 15:51 ` Ville Syrjälä
2005-03-12 16:00 ` Jon Smirl
2005-03-12 16:10 ` Ville Syrjälä
2005-03-12 16:21 ` Jon Smirl
2005-03-12 23:23 ` Benjamin Herrenschmidt
2005-03-12 17:03 ` Torgeir Veimo
2005-03-12 17:21 ` Torgeir Veimo
2005-03-12 17:56 ` Jon Smirl
2005-03-12 23:21 ` Benjamin Herrenschmidt
2005-03-12 23:14 ` Benjamin Herrenschmidt
2005-03-13 3:15 ` Torgeir Veimo
2005-03-12 23:30 ` Benjamin Herrenschmidt
2005-03-16 1:28 ` Torgeir Veimo
[not found] <20050313012923.60373.qmail@web14926.mail.yahoo.com>
2005-03-13 1:37 ` Benjamin Herrenschmidt
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