[PATCH v6 6/8] drm/i915/display: Flush the front buffer in panic handler

[Jocelyn Falempe]

On Lunar Lake, if the panic occurs when fbcon is active, the panic
screen is only partially visible on the screen. Adding this
intel_frontbuffer_flush() call solves the issue.
It's probably not safe to do that in the panic handler, but that's
still better than nothing.

Signed-off-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_atomic_plane.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index eebf20fafaeb..5dc880b963fd 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -59,6 +59,7 @@
 #include "intel_fb.h"
 #include "intel_fb_pin.h"
 #include "intel_fbdev.h"
+#include "intel_frontbuffer.h"
 #include "skl_scaler.h"
 #include "skl_universal_plane.h"
 #include "skl_watermark.h"
@@ -1273,7 +1274,13 @@ static void intel_panic_flush(struct drm_plane *plane)
 
 	/* Don't disable tiling if it's the fbdev framebuffer.*/
 	if (to_intel_framebuffer(fb) == intel_fbdev_framebuffer(display->fbdev.fbdev)) {
+		struct intel_frontbuffer *front = to_intel_frontbuffer(fb);
+		struct drm_gem_object *obj = intel_fb_bo(fb);
+
+		intel_bo_flush_if_display(obj);
+		intel_frontbuffer_flush(front, ORIGIN_DIRTYFB);
 		return;
+	}
 
 	if (fb->modifier && iplane->disable_tiling)
 		iplane->disable_tiling(iplane);
-- 
2.49.0