[PATCH xserver] Fix Xorg -configure not working anymore

[Hans de Goede]

Xorg -configure relies on the bus implementation, e.g.
xf86pciBus.c to call xf86AddBusDeviceToConfigure(). The new
xf86platformBus code does not have support for this.

Almost all drivers support both the xf86platformBus and xf86pciBus
nowadays, and the generic xf86Bus xf86CallDriverProbe() function
prefers the new xf86platformBus probe method when available.

Since the platformBus paths do not call xf86AddBusDeviceToConfigure()
this results in Xorg -configure failing with the following error:
"No devices to configure.  Configuration failed.".

Adding support for the xf86Configure code to xf86platformBus.c
is non trivial and since we advise users to normally run without
any Xorg.conf at all not worth the trouble.

However some users still want to use Xorg -configure to generate a
template config file, this commit implements a minimal fix to make
things work again for PCI devices by skipping the platform
probe method when xf86DoConfigure is set.

This has been tested on a system with integrated intel graphics,
with both the intel and modesetting drivers and restores Xorg -configure
functionality on both cases.

Cc: Adam Jackson <ajax at redhat.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 hw/xfree86/common/xf86Bus.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/xfree86/common/xf86Bus.c b/hw/xfree86/common/xf86Bus.c
index bd36fc5..5b93940 100644
--- a/hw/xfree86/common/xf86Bus.c
+++ b/hw/xfree86/common/xf86Bus.c
@@ -78,7 +78,8 @@ xf86CallDriverProbe(DriverPtr drv, Bool detect_only)
     Bool foundScreen = FALSE;
 
 #ifdef XSERVER_PLATFORM_BUS
-    if (drv->platformProbe != NULL) {
+    /* xf86platformBus.c does not support Xorg -configure */
+    if (!xf86DoConfigure && drv->platformProbe != NULL) {
         foundScreen = xf86platformProbeDev(drv);
     }
     if (ServerIsNotSeat0() && foundScreen)
-- 
2.7.4