Bug 119741

Summary:	radeonfb: BAR 0: can't reserve [mem 0x98000000-0x9fffffff pref]
Product:	Drivers	Reporter:	Mathieu Malaterre (mathieu.malaterre)
Component:	Video(Other)	Assignee:	drivers_video-other
Status:	NEW ---
Severity:	normal
Priority:	P1
Hardware:	PPC-32
OS:	Linux
URL:	https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-October/149375.html
Kernel Version:	4.5.5	Subsystem:
Regression:	No	Bisected commit-id:

Description Mathieu Malaterre 2016-06-07 13:48:28 UTC

On a PowerPC machine, when Open Firmware Frame Buffer is used (OFfb), I
cannot `modprobe radeonfb` (but I can load `radeon`). It currently fails with:

[   96.551486] radeonfb 0000:00:10.0: enabling device (0006 -> 0007)
[   96.551526] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem
0x98000000-0x9fffffff pref]
[   96.551531] radeonfb (0000:00:10.0): cannot request region 0.
[   96.551545] radeonfb: probe of 0000:00:10.0 failed with error -16

It seems (to me) that it should be possible to add something like this
to `radeonfb`:

https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/radeon/radeon_drv.c#L353

[...]
	/* Get rid of things like offb */
	ret = radeon_kick_out_firmware_fb(pdev);
	if (ret)
[...]

Comment 1 Mathieu Malaterre 2016-10-01 12:24:54 UTC

As additional comment, the naive approach of integrating the code from module radeon into radeonfb module did not work, as mentionned in:

https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-October/149375.html