drm/i915: Kick fbdev before vgacon

It's magic, but it seems to work.

This fixes a regression introduced in

commit 1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Jul 8 10:02:43 2014 +0200

    drm/i915: Only unbind vgacon, not other console drivers

My best guess is that the vga fbdev driver falls over if we rip out
parts of vgacon. Hooray.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82439
Cc: stable@vger.kernel.org (v3.16+)
Reported-and-tested-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 1403b01..318ade9 100644 (file)
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1670,15 +1670,17 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
                goto out_regs;
 
        if (drm_core_check_feature(dev, DRIVER_MODESET)) {
-               ret = i915_kick_out_vgacon(dev_priv);
+               /* WARNING: Apparently we must kick fbdev drivers before vgacon,
+                * otherwise the vga fbdev driver falls over. */
+               ret = i915_kick_out_firmware_fb(dev_priv);
                if (ret) {
-                       DRM_ERROR("failed to remove conflicting VGA console\n");
+                       DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
                        goto out_gtt;
                }
 
-               ret = i915_kick_out_firmware_fb(dev_priv);
+               ret = i915_kick_out_vgacon(dev_priv);
                if (ret) {
-                       DRM_ERROR("failed to remove conflicting framebuffer drivers\n");
+                       DRM_ERROR("failed to remove conflicting VGA console\n");
                        goto out_gtt;
                }
        }