drm/ast: Add drm_panic support

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

v7
 * Use drm_for_each_primary_visible_plane()

v8:
 * Replace get_scanout_buffer() logic with drm_panic_set_buffer()
   (Thomas Zimmermann)
v9:
 * Revert to using get_scanout_buffer() (Sima)
 * move get_scanout_buffer() to plane helper functions

v12:
 * Use array for map and pitch in struct drm_scanout_buffer
   to support multi-planar format later. (Thomas Zimmermann)

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Tested-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409163432.352518-10-jfalempe@redhat.com
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index ae21d89b899c8588dd18bde4a40977b96d0edcb6..6695af70768f95e9b943082db3446b592b758dd6 100644 (file)
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -43,6 +43,7 @@
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_gem_shmem_helper.h>
 #include <drm/drm_managed.h>
+#include <drm/drm_panic.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
 
@@ -701,12 +702,29 @@ static void ast_primary_plane_helper_atomic_disable(struct drm_plane *plane,
        ast_set_index_reg_mask(ast, AST_IO_VGASRI, 0x1, 0xdf, 0x20);
 }
 
+static int ast_primary_plane_helper_get_scanout_buffer(struct drm_plane *plane,
+                                                      struct drm_scanout_buffer *sb)
+{
+       struct ast_plane *ast_plane = to_ast_plane(plane);
+
+       if (plane->state && plane->state->fb && ast_plane->vaddr) {
+               sb->format = plane->state->fb->format;
+               sb->width = plane->state->fb->width;
+               sb->height = plane->state->fb->height;
+               sb->pitch[0] = plane->state->fb->pitches[0];
+               iosys_map_set_vaddr_iomem(&sb->map[0], ast_plane->vaddr);
+               return 0;
+       }
+       return -ENODEV;
+}
+
 static const struct drm_plane_helper_funcs ast_primary_plane_helper_funcs = {
        DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
        .atomic_check = ast_primary_plane_helper_atomic_check,
        .atomic_update = ast_primary_plane_helper_atomic_update,
        .atomic_enable = ast_primary_plane_helper_atomic_enable,
        .atomic_disable = ast_primary_plane_helper_atomic_disable,
+       .get_scanout_buffer = ast_primary_plane_helper_get_scanout_buffer,
 };
 
 static const struct drm_plane_funcs ast_primary_plane_funcs = {