[PATCH v3 3/3] drm/simpledrm: Add drm_panic support

[Jocelyn Falempe <jfalempe@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 drivers/gpu/drm/tiny/simpledrm.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 25e11ef11c4c..f0454b58ead3 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>
 
@@ -838,10 +839,24 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 		return ERR_PTR(ret);
 
 	drm_mode_config_reset(dev);
+	drm_panic_register(dev);
 
 	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 +872,7 @@ 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,
 };
 
 /*
@@ -894,6 +910,7 @@ static int simpledrm_remove(struct platform_device *pdev)
 	struct drm_device *dev = &sdev->dev;
 
 	drm_dev_unplug(dev);
+	drm_panic_unregister(dev);
 
 	return 0;
 }
-- 
2.41.0