Lukas Wunner 14d2000182 drm/radeon: Defer probe if gmux is present but its driver isn't
gmux is a microcontroller built into dual GPU MacBook Pros.
On pre-retina MBPs, if we're the inactive GPU, we need apple-gmux
to temporarily switch DDC so that we can probe the panel's EDID.

The checks for CONFIG_VGA_ARB and CONFIG_VGA_SWITCHEROO are necessary
because if either of them is disabled but gmux is present, the driver
would never load, even if we're the active GPU. (vga_default_device()
would evaluate to NULL and vga_switcheroo_handler_flags() would
evaluate to 0.)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/552da6d85a82092146af7b0693595fa2a9ea376b.1452525860.git.lukas@wunner.de
2016-02-09 11:21:13 +01:00
..
2016-02-08 09:55:48 +01:00
2016-01-25 19:35:04 +01:00
2016-02-02 15:37:55 +01:00
2016-01-20 17:30:20 -08:00
2016-02-09 09:25:22 +01:00
2015-12-15 13:39:40 +01:00
2016-02-09 11:17:37 +10:00
2016-02-09 09:25:22 +01:00
2015-10-19 11:00:44 +02:00
2016-01-18 16:44:24 -08:00
2015-12-08 16:07:53 +01:00
2016-02-09 11:21:04 +01:00
2015-12-15 10:22:26 +01:00
2016-01-13 16:43:07 +01:00