linux-kernel - Re: [PATCH v3 1/3] drm/mode_object: add drm_object_immutable_property_get

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Message-ID: <bc484bfe-5fd5-42c7-9068-ca4e7984b774@suse.de>
Date: Tue, 6 Jan 2026 08:24:17 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Harry Wentland <harry.wentland@....com>,
 Leo Li <sunpeng.li@....com>, Rodrigo Siqueira <siqueira@...lia.com>,
 Alex Deucher <alexander.deucher@....com>,
 Christian König <christian.koenig@....com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH v3 1/3] drm/mode_object: add
 drm_object_immutable_property_get_value()



Am 06.01.26 um 04:09 schrieb Dmitry Baryshkov:
> We have a helper to get property values for non-atomic drivers and
> another one default property values for atomic drivers. In some cases we
> need the ability to get value of immutable property, no matter what kind
> of driver it is. Implement new property-related helper,
> drm_object_immutable_property_get_value(), which lets the caller to get
> the value of the immutable property.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>   drivers/gpu/drm/drm_mode_object.c | 25 +++++++++++++++++++++++++
>   include/drm/drm_mode_object.h     |  3 +++
>   2 files changed, 28 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
> index b45d501b10c8..2d943a610b88 100644
> --- a/drivers/gpu/drm/drm_mode_object.c
> +++ b/drivers/gpu/drm/drm_mode_object.c
> @@ -385,6 +385,31 @@ int drm_object_property_get_default_value(struct drm_mode_object *obj,
>   }
>   EXPORT_SYMBOL(drm_object_property_get_default_value);
>   
> +/**
> + * drm_object_immutable_property_get_value - retrieve the value of a property
> + * @obj: drm mode object to get property value from
> + * @property: property to retrieve
> + * @val: storage for the property value
> + *
> + * This function retrieves the software state of the given immutable property
> + * for the given mode object.
> + *
> + * This function can be called by both atomic and non-atomic drivers.
> + *
> + * Returns:
> + * Zero on success, error code on failure.
> + */
> +int drm_object_immutable_property_get_value(struct drm_mode_object *obj,
> +					    struct drm_property *property,
> +					    uint64_t *val)
> +{
> +	if (drm_WARN_ON(property->dev, !(property->flags & DRM_MODE_PROP_IMMUTABLE)))
> +		return -EINVAL;
> +
> +	return __drm_object_property_get_prop_value(obj, property, val);
> +}
> +EXPORT_SYMBOL(drm_object_immutable_property_get_value);
> +
>   /* helper for getconnector and getproperties ioctls */
>   int drm_mode_object_get_properties(struct drm_mode_object *obj, bool atomic,
>   				   bool plane_color_pipeline,
> diff --git a/include/drm/drm_mode_object.h b/include/drm/drm_mode_object.h
> index c68edbd126d0..44a0d6f8d01f 100644
> --- a/include/drm/drm_mode_object.h
> +++ b/include/drm/drm_mode_object.h
> @@ -133,6 +133,9 @@ int drm_object_property_get_value(struct drm_mode_object *obj,
>   int drm_object_property_get_default_value(struct drm_mode_object *obj,
>   					  struct drm_property *property,
>   					  uint64_t *val);
> +int drm_object_immutable_property_get_value(struct drm_mode_object *obj,
> +					    struct drm_property *property,
> +					    uint64_t *val);
>   
>   void drm_object_attach_property(struct drm_mode_object *obj,
>   				struct drm_property *property,
>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)