Disable the framebuffer emulation when a panic occurs, to avoid fbcon
to overwrite the panic screen.
So it's now safe to enable DRM_PANIC and FRAMEBUFFER_CONSOLE.
Signed-off-by: Jocelyn Falempe <jfale...@redhat.com>
---
drivers/gpu/drm/Kconfig | 2 +-
drivers/gpu/drm/drm_panic.c | 4 ++++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 959b19a041018..7a8b1ef4c6bcf 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -106,7 +106,7 @@ config DRM_KMS_HELPER
config DRM_PANIC
bool "Display a user-friendly message when a kernel panic occurs"
- depends on DRM && !FRAMEBUFFER_CONSOLE
+ depends on DRM
select DRM_KMS_HELPER
select FONT_SUPPORT
help
diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c
index 7ece67086cecb..c46a2b878e759 100644
--- a/drivers/gpu/drm/drm_panic.c
+++ b/drivers/gpu/drm/drm_panic.c
@@ -15,6 +15,7 @@
#include <linux/types.h>
#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
@@ -470,6 +471,9 @@ static void draw_panic_plane(struct drm_plane *plane)
int ret;
unsigned long flags;
+ /* Prevent fbcon from overwriting the panic screen */
+ drm_fb_helper_emergency_disable(plane->dev->fb_helper);
+
if (!drm_panic_trylock(plane->dev, flags))
return;
--
2.44.0
