glamor-ddx: Fix the broken switching between VTs.

Now we can allocate frame buffer during the screen initialization.
And set mode major when enter VT. This is the correct logic. The
previous implementation defer the set mode major to create screen
resource which will cause the switching between VTs broken.

Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>

hw/xfree86/glamor/glamor.c

@@ -70,11 +70,18 @@ glamor_resize(ScrnInfoPtr scrn, int width, int height)
 	if (glamor->root != EGL_NO_IMAGE_KHR &&
 	    scrn->virtualX == width && scrn->virtualY == height)
 		return TRUE;
+        else if (scrn->virtualX != width || scrn->virtualY != height) {
 
-        glamor->root_bo = gbm_bo_create(glamor->gbm, width, height,
+            if (glamor->root != EGL_NO_IMAGE_KHR) {
+              eglDestroyImageKHR(glamor->display, glamor->root);
+              gbm_bo_destroy(glamor->root_bo);
+              glamor->root = EGL_NO_IMAGE_KHR;
+            }
+            glamor->root_bo = gbm_bo_create(glamor->gbm, width, height,
                                         GBM_BO_FORMAT_ARGB8888,
                                         GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
-
+        }
+        
 	if (glamor->root_bo == NULL)
 		return FALSE;
 
@@ -206,10 +213,8 @@ glamor_ddx_enter_vt(int scrnIndex, int flags)
 			   "drmSetMaster failed: %s\n", strerror(errno));
 		return FALSE;
 	}
-#if 0
         if (!xf86SetDesiredModes(scrn))
 	  return FALSE;
-#endif               
 	return TRUE;
 }
 
@@ -227,15 +232,15 @@ glamor_ddx_create_screen_resources(ScreenPtr screen)
 {
 	ScrnInfoPtr scrn = xf86Screens[screen->myNum];
 	struct glamor_ddx_screen_private *glamor = glamor_ddx_get_screen_private(scrn);
+        int width = scrn->virtualX;
+        int height = scrn->virtualY;
 
 	screen->CreateScreenResources = glamor->CreateScreenResources;
 	if (!(*screen->CreateScreenResources) (screen))
 		return FALSE;
         if (!glamor_glyphs_init(screen))
                 return FALSE;
-
+        glamor_resize(scrn, width, height);
-	if (!xf86SetDesiredModes(scrn))
-		return FALSE;
 
 	return TRUE;
 }
@@ -293,7 +298,23 @@ glamor_egl_has_extension(struct glamor_ddx_screen_private *glamor, char *extensi
   return FALSE;
 }
 
+static Bool
+glamor_ddx_init_front_buffer(ScrnInfoPtr scrn)
+{
+	struct glamor_ddx_screen_private *glamor = glamor_ddx_get_screen_private(scrn);
+        int width = scrn->virtualX;
+        int height = scrn->virtualY;
 
+        glamor->root_bo = gbm_bo_create(glamor->gbm, width, height,
+                                        GBM_BO_FORMAT_ARGB8888,
+                                        GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
+
+	if (glamor->root_bo == NULL)
+		return FALSE;
+
+        /* XXX shall we update displayWidth here ? */
+        return TRUE;
+}
 
 static Bool
 glamor_ddx_screen_init(int scrnIndex, ScreenPtr screen, int argc, char **argv)
@@ -304,10 +325,10 @@ glamor_ddx_screen_init(int scrnIndex, ScreenPtr screen, int argc, char **argv)
 	VisualPtr visual;
         EGLint config_attribs[] = {
 #ifdef GLAMOR_GLES2
-        EGL_CONTEXT_CLIENT_VERSION, 2, 
+          EGL_CONTEXT_CLIENT_VERSION, 2, 
 #endif
           EGL_NONE
-    };
+        };
 
 
 	/* If serverGeneration != 1 then fd was closed during the last
@@ -398,6 +419,9 @@ glamor_ddx_screen_init(int scrnIndex, ScreenPtr screen, int argc, char **argv)
 	if (!miSetPixmapDepths())
 		return FALSE;
 
+        if (!glamor_ddx_init_front_buffer(scrn))
+                return FALSE;
+
 	if (!fbScreenInit(screen, NULL,
 			  scrn->virtualX, scrn->virtualY,
 			  scrn->xDpi, scrn->yDpi,

hw/xfree86/glamor/glamor_crtc.c

@@ -372,10 +372,22 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 	int ret = TRUE;
 	int i;
 	int fb_id;
+        uint32_t handle, pitch;
 	drmModeModeInfo kmode;
 
-	if (!drmmode_update_fb(scrn, scrn->virtualX, scrn->virtualY))
+        if (drmmode->fb_id == 0) {
-		return FALSE;
+
+	        glamor_frontbuffer_handle(scrn, &handle, &pitch);
+                ret = drmModeAddFB(drmmode->fd,
+                                   scrn->virtualX, scrn->virtualY,
+                                   scrn->depth, scrn->bitsPerPixel,
+                                   pitch, handle,
+                                   &drmmode->fb_id);
+                if (ret < 0) {
+                        ErrorF("failed to add fb\n");
+                        return FALSE;
+                }
+        }
 
 	saved_mode = crtc->mode;
 	saved_x = crtc->x;