[PATCH xserver] config: fix GPUDevice fail when AutoAddGPU off + BusID

[Qiang Yu]

This fix is for the following xorg.conf can work:

Section "ServerFlags"
        Option  "AutoAddGPU" "off"
EndSection

Section "Device"
        Identifier "Amd"
        Driver "ati"
        BusID "PCI:1:0:0"
EndSection

Section "Device"
        Identifier "Intel"
        Driver "modesetting"
        BusID "pci:0:2:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device "Intel"
        GPUDevice "Amd"
EndSection

Without AutoAddGPU off, modesetting DDX will also be loaded
for GPUDevice.

Signed-off-by: Qiang Yu <Qiang.Yu at amd.com>
---
 hw/xfree86/common/xf86platformBus.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/hw/xfree86/common/xf86platformBus.c b/hw/xfree86/common/xf86platformBus.c
index 96895a6..03fd931 100644
--- a/hw/xfree86/common/xf86platformBus.c
+++ b/hw/xfree86/common/xf86platformBus.c
@@ -418,6 +418,19 @@ probeSingleDevice(struct xf86_platform_device *dev, DriverPtr drvp, GDevPtr gdev
     return foundScreen;
 }
 
+static Bool
+isGPUDevice(GDevPtr gdev)
+{
+    int i;
+
+    for (i = 0; i < gdev->myScreenSection->num_gpu_devices; i++) {
+        if (gdev == gdev->myScreenSection->gpu_devices[i])
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
 int
 xf86platformProbeDev(DriverPtr drvp)
 {
@@ -450,9 +463,8 @@ xf86platformProbeDev(DriverPtr drvp)
         if (j == xf86_num_platform_devices)
              continue;
 
-        foundScreen = probeSingleDevice(&xf86_platform_devices[j], drvp, devList[i], 0);
-        if (!foundScreen)
-            continue;
+        foundScreen = probeSingleDevice(&xf86_platform_devices[j], drvp, devList[i],
+                                        isGPUDevice(devList[i]) ? PLATFORM_PROBE_GPU_SCREEN : 0);
     }
 
     /* if autoaddgpu devices is enabled then go find any unclaimed platform
-- 
2.7.4