Re: [PATCH v2] drm/of: Consider the state in which the ep is disabled

[Heiko Stübner]

Am Dienstag, 7. Juli 2020, 13:25:26 CEST schrieb Sandy Huang:
> don't mask possible_crtcs if remote-point is disabled.
> 
> Signed-off-by: Sandy Huang <hjc@xxxxxxxxxxxxxx>

Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>

changes in v2:
- drop additional of_node_put, as ep will be put with the next
  iteration of for_each_endpoint_of_node()


As this touches a pretty central function is there something
to keep in mind in regards to other DRM drivers?
[question for the broader audience ;-) ]

Heiko

> ---
>  drivers/gpu/drm/drm_of.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index fdb05fbf72a0..565f05f5f11b 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -66,6 +66,9 @@ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
>  	uint32_t possible_crtcs = 0;
>  
>  	for_each_endpoint_of_node(port, ep) {
> +		if (!of_device_is_available(ep))
> +			continue;
> +
>  		remote_port = of_graph_get_remote_port(ep);
>  		if (!remote_port) {
>  			of_node_put(ep);
>