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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6 
 kernel/Documentation/gpu/drm-kms.rst
....@@ -3,7 +3,7 @@
33 =========================
44 
55 Drivers must initialize the mode setting core by calling
6
-:c:func:`drm_mode_config_init()` on the DRM device. The function
6
+drmm_mode_config_init() on the DRM device. The function
77 initializes the :c:type:`struct drm_device <drm_device>`
88 mode_config field and never fails. Once done, mode configuration must
99 be setup by initializing the following fields.
....@@ -181,8 +181,7 @@
181181 directly instantiated on each object, but free-standing mode objects themselves,
182182 represented by :c:type:`struct drm_property <drm_property>`, which only specify
183183 the type and value range of a property. Any given property can be attached
184
-multiple times to different objects using :c:func:`drm_object_attach_property()
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-<drm_object_attach_property>`.
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+multiple times to different objects using drm_object_attach_property().
186185 
187186 .. kernel-doc:: include/drm/drm_mode_object.h
188187    :internal:
....@@ -260,7 +259,8 @@
260259   drm_connector_state <drm_connector_state>` for connectors. These are the only
261260   objects with userspace-visible and settable state. For internal state drivers
262261   can subclass these structures through embeddeding, or add entirely new state
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-  structures for their globally shared hardware functions.
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+  structures for their globally shared hardware functions, see :c:type:`struct
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+  drm_private_state<drm_private_state>`.
264264 
265265 - An atomic update is assembled and validated as an entirely free-standing pile
266266   of structures within the :c:type:`drm_atomic_state <drm_atomic_state>`
....@@ -268,6 +268,14 @@
268268   structure; see the next chapter.  Only when a state is committed is it applied
269269   to the driver and modeset objects. This way rolling back an update boils down
270270   to releasing memory and unreferencing objects like framebuffers.
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+
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+Locking of atomic state structures is internally using :c:type:`struct
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+drm_modeset_lock <drm_modeset_lock>`. As a general rule the locking shouldn't be
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+exposed to drivers, instead the right locks should be automatically acquired by
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+any function that duplicates or peeks into a state, like e.g.
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+drm_atomic_get_crtc_state().  Locking only protects the software data
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+structure, ordering of committing state changes to hardware is sequenced using
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+:c:type:`struct drm_crtc_commit <drm_crtc_commit>`.
271279 
272280 Read on in this chapter, and also in :ref:`drm_atomic_helper` for more detailed
273281 coverage of specific topics.
....@@ -287,8 +295,14 @@
287295 .. kernel-doc:: drivers/gpu/drm/drm_atomic.c
288296    :export:
289297 
290
-.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
291
-   :internal:
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+Atomic Mode Setting IOCTL and UAPI Functions
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+--------------------------------------------
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+
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+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
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+   :doc: overview
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+
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+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
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+   :export:
292306 
293307 CRTC Abstraction
294308 ================
....@@ -322,6 +336,12 @@
322336 
323337 DRM Format Handling
324338 ===================
339
+
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+.. kernel-doc:: include/uapi/drm/drm_fourcc.h
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+   :doc: overview
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+
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+Format Functions Reference
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+--------------------------
325345 
326346 .. kernel-doc:: include/drm/drm_fourcc.h
327347    :internal:
....@@ -377,6 +397,9 @@
377397 Writeback Connectors
378398 --------------------
379399 
400
+.. kernel-doc:: include/drm/drm_writeback.h
401
+  :internal:
402
+
380403 .. kernel-doc:: drivers/gpu/drm/drm_writeback.c
381404   :doc: overview
382405 
....@@ -397,102 +420,6 @@
397420 
398421 .. kernel-doc:: drivers/gpu/drm/drm_encoder.c
399422    :export:
400
-
401
-KMS Initialization and Cleanup
402
-==============================
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-
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-A KMS device is abstracted and exposed as a set of planes, CRTCs,
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-encoders and connectors. KMS drivers must thus create and initialize all
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-those objects at load time after initializing mode setting.
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-
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-CRTCs (:c:type:`struct drm_crtc <drm_crtc>`)
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---------------------------------------------
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-
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-A CRTC is an abstraction representing a part of the chip that contains a
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-pointer to a scanout buffer. Therefore, the number of CRTCs available
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-determines how many independent scanout buffers can be active at any
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-given time. The CRTC structure contains several fields to support this:
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-a pointer to some video memory (abstracted as a frame buffer object), a
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-display mode, and an (x, y) offset into the video memory to support
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-panning or configurations where one piece of video memory spans multiple
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-CRTCs.
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-
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-CRTC Initialization
421
-~~~~~~~~~~~~~~~~~~~
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-
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-A KMS device must create and register at least one struct
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-:c:type:`struct drm_crtc <drm_crtc>` instance. The instance is
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-allocated and zeroed by the driver, possibly as part of a larger
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-structure, and registered with a call to :c:func:`drm_crtc_init()`
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-with a pointer to CRTC functions.
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-
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-
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-Cleanup
431
--------
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-
433
-The DRM core manages its objects' lifetime. When an object is not needed
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-anymore the core calls its destroy function, which must clean up and
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-free every resource allocated for the object. Every
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-:c:func:`drm_\*_init()` call must be matched with a corresponding
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-:c:func:`drm_\*_cleanup()` call to cleanup CRTCs
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-(:c:func:`drm_crtc_cleanup()`), planes
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-(:c:func:`drm_plane_cleanup()`), encoders
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-(:c:func:`drm_encoder_cleanup()`) and connectors
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-(:c:func:`drm_connector_cleanup()`). Furthermore, connectors that
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-have been added to sysfs must be removed by a call to
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-:c:func:`drm_connector_unregister()` before calling
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-:c:func:`drm_connector_cleanup()`.
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-
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-Connectors state change detection must be cleanup up with a call to
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-:c:func:`drm_kms_helper_poll_fini()`.
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-
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-Output discovery and initialization example
450
--------------------------------------------
451
-
452
-.. code-block:: c
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-
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-    void intel_crt_init(struct drm_device *dev)
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-    {
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-        struct drm_connector *connector;
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-        struct intel_output *intel_output;
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-
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-        intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
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-        if (!intel_output)
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-            return;
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-
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-        connector = &intel_output->base;
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-        drm_connector_init(dev, &intel_output->base,
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-                   &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
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-
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-        drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs,
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-                 DRM_MODE_ENCODER_DAC);
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-
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-        drm_connector_attach_encoder(&intel_output->base,
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-                          &intel_output->enc);
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-
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-        /* Set up the DDC bus. */
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-        intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A");
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-        if (!intel_output->ddc_bus) {
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-            dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
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-                   "failed.\n");
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-            return;
479
-        }
480
-
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-        intel_output->type = INTEL_OUTPUT_ANALOG;
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-        connector->interlace_allowed = 0;
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-        connector->doublescan_allowed = 0;
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-
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-        drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs);
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-        drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
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-
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-        drm_connector_register(connector);
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-    }
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-
491
-In the example above (taken from the i915 driver), a CRTC, connector and
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-encoder combination is created. A device-specific i2c bus is also
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-created for fetching EDID data and performing monitor detection. Once
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-the process is complete, the new connector is registered with sysfs to
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-make its properties available to applications.
496423 
497424 KMS Locking
498425 ===========
....@@ -533,6 +460,12 @@
533460 .. kernel-doc:: drivers/gpu/drm/drm_connector.c
534461    :doc: HDMI connector properties
535462 
463
+Standard CRTC Properties
464
+------------------------
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+
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+.. kernel-doc:: drivers/gpu/drm/drm_crtc.c
467
+   :doc: standard CRTC properties
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+
536469 Plane Composition Properties
537470 ----------------------------
538471 
....@@ -541,6 +474,18 @@
541474 
542475 .. kernel-doc:: drivers/gpu/drm/drm_blend.c
543476    :export:
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+
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+FB_DAMAGE_CLIPS
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+~~~~~~~~~~~~~~~
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+
481
+.. kernel-doc:: drivers/gpu/drm/drm_damage_helper.c
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+   :doc: overview
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+
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+.. kernel-doc:: drivers/gpu/drm/drm_damage_helper.c
485
+   :export:
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+
487
+.. kernel-doc:: include/drm/drm_damage_helper.h
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+   :internal:
544489 
545490 Color Management Properties
546491 ---------------------------
....@@ -551,6 +496,9 @@
551496 .. kernel-doc:: drivers/gpu/drm/drm_color_mgmt.c
552497    :export:
553498 
499
+.. kernel-doc:: include/drm/drm_color_mgmt.h
500
+   :internal:
501
+
554502 Tile Group Property
555503 -------------------
556504 
....@@ -560,8 +508,15 @@
560508 Explicit Fencing Properties
561509 ---------------------------
562510 
563
-.. kernel-doc:: drivers/gpu/drm/drm_atomic.c
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+.. kernel-doc:: drivers/gpu/drm/drm_atomic_uapi.c
564512    :doc: explicit fencing properties
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+
514
+
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+Variable Refresh Properties
516
+---------------------------
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+
518
+.. kernel-doc:: drivers/gpu/drm/drm_connector.c
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+   :doc: Variable refresh properties
565520 
566521 Existing KMS Properties
567522 -----------------------
....@@ -588,3 +543,18 @@
588543 
589544 .. kernel-doc:: drivers/gpu/drm/drm_vblank.c
590545    :export:
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+
547
+Vertical Blank Work
548
+===================
549
+
550
+.. kernel-doc:: drivers/gpu/drm/drm_vblank_work.c
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+   :doc: vblank works
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+
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+Vertical Blank Work Functions Reference
554
+---------------------------------------
555
+
556
+.. kernel-doc:: include/drm/drm_vblank_work.h
557
+   :internal:
558
+
559
+.. kernel-doc:: drivers/gpu/drm/drm_vblank_work.c
560
+   :export: