[PATCH v4 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 at redhat.com>
---
 drivers/gpu/drm/i915/display/intel_atomic_plane.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index 96697ac0ef69a..ee8cc82af3a8b 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -56,6 +56,7 @@
 #include "intel_fb.h"
 #include "intel_fb_pin.h"
 #include "intel_fbdev.h"
+#include "intel_frontbuffer.h"
 #include "skl_scaler.h"
 #include "skl_watermark.h"
 
@@ -1211,8 +1212,14 @@ static void intel_panic_flush(struct drm_plane *plane)
 	drm_clflush_virt_range(panic_map.vaddr, fb->height * fb->pitches[0]);
 
 	/* Don't disable tiling if it's the fbdev framebuffer.*/
-	if (to_intel_framebuffer(fb) == intel_fbdev_framebuffer(dev_priv->display.fbdev.fbdev))
+	if (to_intel_framebuffer(fb) == intel_fbdev_framebuffer(dev_priv->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);
-- 
2.47.1