linux-kernel - Re: [PATCH 06/29] drm/bridge: Implement atomic_print

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Message-ID: <056b0335-f104-4b67-9882-6beaecd21c76@suse.de>
Date: Tue, 2 Sep 2025 15:22:40 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Maxime Ripard <mripard@...nel.org>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Jyri Sarha <jyri.sarha@....fi>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Devarsh Thakkar <devarsht@...com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/29] drm/bridge: Implement atomic_print_state

Hi

Am 02.09.25 um 10:32 schrieb Maxime Ripard:
> Bridges have some fields in their state worth printing, but we don't
> provide an atomic_print_state implementation to show those fields.
>
> Let's do so.
>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>   drivers/gpu/drm/drm_bridge.c | 18 ++++++++++++++++++
>   1 file changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index dd439d55177a867acb7ab73c02182bada44d93c9..e803dfd8fd5aae9c16931445213df04d8715b9f6 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -370,13 +370,31 @@ drm_bridge_atomic_destroy_priv_state(struct drm_private_obj *obj,
>   	struct drm_bridge *bridge = drm_priv_to_bridge(obj);
>   
>   	bridge->funcs->atomic_destroy_state(bridge, state);
>   }
>   
> +static void
> +drm_bridge_atomic_print_priv_state(struct drm_printer *p,
> +				   const struct drm_private_state *s)
> +{
> +	const struct drm_bridge_state *state =
> +		container_of_const(s, struct drm_bridge_state, base);

Maybe adopt drm_priv_to_bridge_state() to accept const pointers?

https://elixir.bootlin.com/linux/v6.16.4/source/include/drm/drm_atomic.h#L1236



> +	struct drm_bridge *bridge = drm_priv_to_bridge(s->obj);
> +
> +	drm_printf(p, "bridge: %s", drm_get_connector_type_name(bridge->type));
> +	drm_printf(p, "\tinput bus configuration:");
> +	drm_printf(p, "\t\tcode: %04x", state->input_bus_cfg.format);
> +	drm_printf(p, "\t\tflags: %08x", state->input_bus_cfg.flags);
> +	drm_printf(p, "\toutput bus configuration:");
> +	drm_printf(p, "\t\tcode: %04x", state->output_bus_cfg.format);
> +	drm_printf(p, "\t\tflags: %08x", state->output_bus_cfg.flags);
> +}
> +
>   static const struct drm_private_state_funcs drm_bridge_priv_state_funcs = {
>   	.atomic_duplicate_state = drm_bridge_atomic_duplicate_priv_state,
>   	.atomic_destroy_state = drm_bridge_atomic_destroy_priv_state,
> +	.atomic_print_state = drm_bridge_atomic_print_priv_state,
>   };
>   
>   static bool drm_bridge_is_atomic(struct drm_bridge *bridge)
>   {
>   	return bridge->funcs->atomic_reset != NULL;
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)