[PATCH v4 3/4] drm/simpledrm: Add drm_panic support

[Jocelyn Falempe <jfalempe@redhat.com>]

Add support for the drm_panic module, which displays a user-friendly
message to the screen when a kernel panic occurs.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
---
 drivers/gpu/drm/tiny/simpledrm.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 25e11ef11c4c..ee62303ef68a 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -23,6 +23,7 @@
 #include <drm/drm_gem_shmem_helper.h>
 #include <drm/drm_managed.h>
 #include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_panic.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 
@@ -842,6 +843,19 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 	return sdev;
 }
 
+static int simpledrm_get_scanout_buffer(struct drm_device *dev,
+					struct drm_scanout_buffer *sb)
+{
+	struct simpledrm_device *sdev = simpledrm_device_of_dev(dev);
+
+	sb->width = sdev->mode.hdisplay;
+	sb->height = sdev->mode.vdisplay;
+	sb->pitch = sdev->pitch;
+	sb->format = sdev->format;
+	sb->map = sdev->screen_base;
+	return 0;
+}
+
 /*
  * DRM driver
  */
@@ -857,6 +871,7 @@ static struct drm_driver simpledrm_driver = {
 	.minor			= DRIVER_MINOR,
 	.driver_features	= DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
 	.fops			= &simpledrm_fops,
+	.get_scanout_buffer	= simpledrm_get_scanout_buffer,
 };
 
 /*
-- 
2.41.0