[v9,9/9] drm/ast: Add drm_panic support

[Sui Jingfeng]

On 2024/3/7 17:14, Jocelyn Falempe wrote:
> 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
>
> Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>


I have done very limited test with ast2600, basically works by trigger via debugfs interface as the cover-letter said.
so,

Tested-by: Sui Jingfeng <sui.jingfeng at linux.dev>