[PATCH] drm: warn if cursor plane is set with legacy funcs

[Daniel Vetter]

On Tue, Dec 22, 2020 at 02:40:02PM +0100, Simon Ser wrote:
> A driver must not set drm_crtc.cursor and any of the legacy funcs at the
> same time, otherwise it's not clear which one DRM core should use for
> legacy cursor updates.
> 
> Signed-off-by: Simon Ser <contact at emersion.fr>
> Cc: Daniel Vetter <daniel at ffwll.ch>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  drivers/gpu/drm/drm_mode_config.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
> index 9611f21bca00..92e56baf04ad 100644
> --- a/drivers/gpu/drm/drm_mode_config.c
> +++ b/drivers/gpu/drm/drm_mode_config.c
> @@ -645,6 +645,16 @@ void drm_mode_config_validate(struct drm_device *dev)
>  		WARN(!crtc->primary, "Missing primary plane on [CRTC:%d:%s]\n",
>  		     crtc->base.id, crtc->name);
>  
> +		WARN(crtc->cursor && crtc->funcs->cursor_set,
> +		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set func",
> +		     crtc->base.id, crtc->name);
> +		WARN(crtc->cursor && crtc->funcs->cursor_set2,
> +		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set2 func",
> +		     crtc->base.id, crtc->name);
> +		WARN(crtc->cursor && crtc->funcs->cursor_move,
> +		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_move func",
> +		     crtc->base.id, crtc->name);
> +
>  		if (crtc->primary) {
>  			WARN(!(crtc->primary->possible_crtcs & drm_crtc_mask(crtc)),
>  			     "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
> -- 
> 2.29.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch