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

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Message-Id: <20251115-drm-fix-lut-checks-v1-1-3586f5855bc7@oss.qualcomm.com>
Date: Sat, 15 Nov 2025 05:42:49 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        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: [PATCH 1/3] drm/mode_object: add
 drm_object_immutable_property_get_value()

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>
---
 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 e943205a2394cd9c0d64b940a5e15ccff7f35246..ead8eeafd0126ee2028efc3ba747d37307e8d72b 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -384,6 +384,31 @@ 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 softare state of the given immutable property for the given
+ * property.
+ *
+ * This function can be called directtly 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 (WARN_ON(!(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,
 				   uint32_t __user *prop_ptr,
diff --git a/include/drm/drm_mode_object.h b/include/drm/drm_mode_object.h
index c68edbd126d04d51221f50aa2b4166475543b59f..44a0d6f8d01fbcd9db3dc2d6d374f185459ae879 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,

-- 
2.47.3