xfree86: Add GPU screens even if there are no active GDevs

xf86platformProbeDev creates GPU screens for any platform devices that were not
matched by a GDev in the loop above, but only if there was at least one device.
This means that it's impossible to configure a device as a GPU screen if there
is only one platform device that matches that driver.

Instead, create a GPU screen (if possible) for any platform device that was not
claimed by the GDev loop.

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/hw/xfree86/common/xf86platformBus.c b/hw/xfree86/common/xf86platformBus.c
index 387b5f1ad..c1aaba41a 100644
--- a/hw/xfree86/common/xf86platformBus.c
+++ b/hw/xfree86/common/xf86platformBus.c
@@ -428,6 +428,10 @@ xf86platformProbeDev(DriverPtr drvp)
 
     /* find the main device or any device specificed in xorg.conf */
     for (i = 0; i < numDevs; i++) {
+        /* skip inactive devices */
+        if (!devList[i]->active)
+            continue;
+
         for (j = 0; j < xf86_num_platform_devices; j++) {
             if (devList[i]->busID && *devList[i]->busID) {
                 if (xf86PlatformDeviceCheckBusID(&xf86_platform_devices[j], devList[i]->busID))
@@ -451,10 +455,14 @@ xf86platformProbeDev(DriverPtr drvp)
             continue;
     }
 
-    /* if autoaddgpu devices is enabled then go find a few more and add them as GPU screens */
-    if (xf86Info.autoAddGPU && numDevs) {
+    /* if autoaddgpu devices is enabled then go find any unclaimed platform
+     * devices and add them as GPU screens */
+    if (xf86Info.autoAddGPU) {
         for (j = 0; j < xf86_num_platform_devices; j++) {
-            probeSingleDevice(&xf86_platform_devices[j], drvp, devList[0], PLATFORM_PROBE_GPU_SCREEN);
+            if (probeSingleDevice(&xf86_platform_devices[j], drvp,
+                                  devList ?  devList[0] : NULL,
+                                  PLATFORM_PROBE_GPU_SCREEN))
+                foundScreen = TRUE;
         }
     }