[PATCH] drm/i915: fbdev_set_par reliably invalidating frontbuffer

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

fbdev_set_par is called when fbcon is taking over control.
In the past frontbuffer was being invalidated on
set_to_gtt_domain, but it moved to set_domain fixing that case,
but left this behind.

Commit that changed this fixing set_domain case was:

commit 031b698a77a70a6c394568034437b5486a44e868
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Jun 26 19:35:16 2015 +0200

    drm/i915: Unconditionally do fb tracking invalidate in set_domain

Since we are also invalidating in other fbdev cases this one
was masked here. At least until now that I found this corner
case: On boot with plymouth doing a splash screen
when returning to the console frontbuffer wans't being invalidated
causing missed screen updates with PSR enabled.

So this patch fixes this issue.

v2: Make invalidate directly and unconditionally and
    fix commit message indicating the set_domain fix
    as pointed out by Daniel.

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_fbdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 2a1724e..44c9ccc 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -63,8 +63,8 @@ static int intel_fbdev_set_par(struct fb_info *info)
 		 * now until we solve this for real.
 		 */
 		mutex_lock(&fb_helper->dev->struct_mutex);
-		ret = i915_gem_object_set_to_gtt_domain(ifbdev->fb->obj,
-							true);
+		if (ifbdev->fb->obj)
+			intel_fb_obj_invalidate(ifbdev->fb->obj, ORIGIN_GTT);
 		mutex_unlock(&fb_helper->dev->struct_mutex);
 	}
 
-- 
2.1.0

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