drm/imx: Add drm_panic support

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

v7:
 * use drm_panic_gem_get_scanout_buffer() helper

v8:
 * Replace get_scanout_buffer() logic with drm_panic_set_buffer()

v9:
 * Revert to using get_scanout_buffer() (Sima)
 * move get_scanout_buffer() to plane helper functions

v12:
 * Rename drm_panic_gem_get_scanout_buffer to drm_fb_dma_get_scanout_buffer
 (Thomas Zimmermann)

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240409163432.352518-9-jfalempe@redhat.com
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
index dade8b59feaef7b13bc9d14c6391ebaf99a070aa..704c549750f950c3f0ce5d6c6f637d9d7b53fb69 100644 (file)
--- a/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3/ipuv3-plane.c
@@ -773,6 +773,13 @@ static const struct drm_plane_helper_funcs ipu_plane_helper_funcs = {
        .atomic_update = ipu_plane_atomic_update,
 };
 
+static const struct drm_plane_helper_funcs ipu_primary_plane_helper_funcs = {
+       .atomic_check = ipu_plane_atomic_check,
+       .atomic_disable = ipu_plane_atomic_disable,
+       .atomic_update = ipu_plane_atomic_update,
+       .get_scanout_buffer = drm_fb_dma_get_scanout_buffer,
+};
+
 bool ipu_plane_atomic_update_pending(struct drm_plane *plane)
 {
        struct ipu_plane *ipu_plane = to_ipu_plane(plane);
@@ -916,7 +923,10 @@ struct ipu_plane *ipu_plane_init(struct drm_device *dev, struct ipu_soc *ipu,
        ipu_plane->dma = dma;
        ipu_plane->dp_flow = dp;
 
-       drm_plane_helper_add(&ipu_plane->base, &ipu_plane_helper_funcs);
+       if (type == DRM_PLANE_TYPE_PRIMARY)
+               drm_plane_helper_add(&ipu_plane->base, &ipu_primary_plane_helper_funcs);
+       else
+               drm_plane_helper_add(&ipu_plane->base, &ipu_plane_helper_funcs);
 
        if (dp == IPU_DP_FLOW_SYNC_BG || dp == IPU_DP_FLOW_SYNC_FG)
                ret = drm_plane_create_zpos_property(&ipu_plane->base, zpos, 0,