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

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Date:   Mon, 06 Jul 2020 11:47:34 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Sandy Huang <hjc@...k-chips.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, huangtao@...k-chips.com,
        andy.yan@...k-chips.com, kever.yang@...k-chips.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/of: Consider the state in which the ep is disabled

Hi Sandy,

Am Montag, 6. Juli 2020, 09:59:44 CEST schrieb Sandy Huang:
> don't mask possible_crtcs if remote-point is disabled.
> 
> Signed-off-by: Sandy Huang <hjc@...k-chips.com>
> ---
>  drivers/gpu/drm/drm_of.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index fdb05fbf72a0..f5f250435add 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -66,6 +66,11 @@ 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)) {
> +			of_node_put(ep);

You'd only need the of_node_put here, if you were exiting the loop.

With the "continue" below, the next iteration of for_each_endpoint_of_node
will do the put on "ep"


Heiko

> +			continue;
> +		}
> +
>  		remote_port = of_graph_get_remote_port(ep);
>  		if (!remote_port) {
>  			of_node_put(ep);
>