drm/amd/display: add DC drm_panic support

Add support for the drm_panic module, which displays a pretty user
friendly message on the screen when a Linux kernel panic occurs.

It doesn't work yet on laptop panels, maybe due to PSR.

Adapted from Jocelyn's original patch to add DC drm_panic
support.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Lu Yao <yaolu@kylinos.cn>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Harry Wentland <harry.wentland@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
index 495e3cd70426db0182cb2811bc6d5d09f52f8a4b..c10cabb8b42bd39f80a86c96bb0c6735e14e786e 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
@@ -26,6 +26,7 @@
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_blend.h>
+#include "drm/drm_framebuffer.h"
 #include <drm/drm_gem_atomic_helper.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
@@ -1421,6 +1422,20 @@ static void amdgpu_dm_plane_atomic_async_update(struct drm_plane *plane,
        amdgpu_dm_plane_handle_cursor_update(plane, old_state);
 }
 
+static void amdgpu_dm_plane_panic_flush(struct drm_plane *plane)
+{
+       struct dm_plane_state *dm_plane_state = to_dm_plane_state(plane->state);
+       struct drm_framebuffer *fb = plane->state->fb;
+       struct dc_plane_state *dc_plane_state;
+
+       if (!dm_plane_state || !dm_plane_state->dc_state)
+               return;
+
+       dc_plane_state = dm_plane_state->dc_state;
+
+       dc_plane_force_update_for_panic(dc_plane_state, fb->modifier ? true : false);
+}
+
 static const struct drm_plane_helper_funcs dm_plane_helper_funcs = {
        .prepare_fb = amdgpu_dm_plane_helper_prepare_fb,
        .cleanup_fb = amdgpu_dm_plane_helper_cleanup_fb,
@@ -1429,6 +1444,16 @@ static const struct drm_plane_helper_funcs dm_plane_helper_funcs = {
        .atomic_async_update = amdgpu_dm_plane_atomic_async_update
 };
 
+static const struct drm_plane_helper_funcs dm_primary_plane_helper_funcs = {
+       .prepare_fb = amdgpu_dm_plane_helper_prepare_fb,
+       .cleanup_fb = amdgpu_dm_plane_helper_cleanup_fb,
+       .atomic_check = amdgpu_dm_plane_atomic_check,
+       .atomic_async_check = amdgpu_dm_plane_atomic_async_check,
+       .atomic_async_update = amdgpu_dm_plane_atomic_async_update,
+       .get_scanout_buffer = amdgpu_display_get_scanout_buffer,
+       .panic_flush = amdgpu_dm_plane_panic_flush,
+};
+
 static void amdgpu_dm_plane_drm_plane_reset(struct drm_plane *plane)
 {
        struct dm_plane_state *amdgpu_state = NULL;
@@ -1855,7 +1880,10 @@ int amdgpu_dm_plane_init(struct amdgpu_display_manager *dm,
            plane->type != DRM_PLANE_TYPE_CURSOR)
                drm_plane_enable_fb_damage_clips(plane);
 
-       drm_plane_helper_add(plane, &dm_plane_helper_funcs);
+       if (plane->type == DRM_PLANE_TYPE_PRIMARY)
+               drm_plane_helper_add(plane, &dm_primary_plane_helper_funcs);
+       else
+               drm_plane_helper_add(plane, &dm_plane_helper_funcs);
 
 #ifdef AMD_PRIVATE_COLOR
        dm_atomic_plane_attach_color_mgmt_properties(dm, plane);