xfree86: Make adding unclaimed devices as GPU devices a separate step

This is primarily a preparation patch for fixing the xserver exiting with
a "no screens found" error even though there are supported video cards,
due to the server not recognizing any card as the primary card.

This also fixes the (mostly theoretical) case of a platformBus capable
driver adding a device as GPUscreen before a driver which only supports
the old PCI probe method gets a chance to claim it as a normal screen.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit 7121b03d324fccf687d49b63c53da7c8d93038c9)

3 files changed, 25 insertions, 0 deletions

diff --git a/hw/xfree86/common/xf86Bus.c b/hw/xfree86/common/xf86Bus.c
index 27c6b1b8b..a3a989866 100644
--- a/hw/xfree86/common/xf86Bus.c
+++ b/hw/xfree86/common/xf86Bus.c
@@ -125,6 +125,10 @@ xf86BusConfig(void)
         xf86CallDriverProbe(xf86DriverList[i], FALSE);
     }
 
+    for (i = 0; i < xf86NumDrivers; i++) {
+        xf86platformAddGPUDevices(xf86DriverList[i]);
+    }
+
     /* If nothing was detected, return now */
     if (xf86NumScreens == 0) {
         xf86Msg(X_ERROR, "No devices detected.\n");
diff --git a/hw/xfree86/common/xf86platformBus.c b/hw/xfree86/common/xf86platformBus.c
index 39fb1dd36..8dd0d5da7 100644
--- a/hw/xfree86/common/xf86platformBus.c
+++ b/hw/xfree86/common/xf86platformBus.c
@@ -475,6 +475,21 @@ xf86platformProbeDev(DriverPtr drvp)
                                         isGPUDevice(devList[i]) ? PLATFORM_PROBE_GPU_SCREEN : 0);
     }
 
+    return foundScreen;
+}
+
+int
+xf86platformAddGPUDevices(DriverPtr drvp)
+{
+    Bool foundScreen = FALSE;
+    GDevPtr *devList;
+    int j;
+
+    if (!drvp->platformProbe)
+        return FALSE;
+
+    xf86MatchDevice(drvp->driverName, &devList);
+
     /* if autoaddgpu devices is enabled then go find any unclaimed platform
      * devices and add them as GPU screens */
     if (xf86Info.autoAddGPU) {
diff --git a/hw/xfree86/common/xf86platformBus.h b/hw/xfree86/common/xf86platformBus.h
index a7335b9da..0f5c0ef29 100644
--- a/hw/xfree86/common/xf86platformBus.h
+++ b/hw/xfree86/common/xf86platformBus.h
@@ -41,6 +41,7 @@ struct xf86_platform_device {
 #ifdef XSERVER_PLATFORM_BUS
 int xf86platformProbe(void);
 int xf86platformProbeDev(DriverPtr drvp);
+int xf86platformAddGPUDevices(DriverPtr drvp);
 
 extern int xf86_num_platform_devices;
 extern struct xf86_platform_device *xf86_platform_devices;
@@ -156,6 +157,11 @@ xf86PlatformMatchDriver(char *matches[], int nmatches);
 
 extern void xf86platformVTProbe(void);
 extern void xf86platformPrimary(void);
+
+#else
+
+static inline int xf86platformAddGPUDevices(DriverPtr drvp) { return FALSE; }
+
 #endif
 
 #endif