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drm/kms-helpers: Use recommened kerneldoc for struct member refs

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I just learned that &struct_name.member_name works and looks pretty
even. It doesn't (yet) link to the member directly though, which would
be really good for big structures or vfunc tables (where the
per-member kerneldoc tends to be long).

Also some minor drive-by polish where it makes sense, I read a lot
of docs ...

v2: Comments from Gustavo.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Rewiewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170125062657.19270-2-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2017-01-25 07:26:43 +01:00
parent 7b0a89a6db
commit 6806cdf9aa
11 changed files with 196 additions and 180 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

95
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -458,22 +458,25 @@ mode_fixup(struct drm_atomic_state *state)
* Check the state object to see if the requested state is physically possible.
* This does all the crtc and connector related computations for an atomic
* update and adds any additional connectors needed for full modesets and calls
* down into ->mode_fixup functions of the driver backend.
* down into &drm_crtc_helper_funcs.mode_fixup and
* &drm_encoder_helper_funcs.mode_fixup or
* &drm_encoder_helper_funcs.atomic_check functions of the driver backend.
*
* crtc_state->mode_changed is set when the input mode is changed.
* crtc_state->connectors_changed is set when a connector is added or
* removed from the crtc.
* crtc_state->active_changed is set when crtc_state->active changes,
* which is used for dpms.
* &drm_crtc_state.mode_changed is set when the input mode is changed.
* &drm_crtc_state.connectors_changed is set when a connector is added or
* removed from the crtc. &drm_crtc_state.active_changed is set when
* &drm_crtc_state.active changes, which is used for DPMS.
* See also: drm_atomic_crtc_needs_modeset()
*
* IMPORTANT:
*
* Drivers which set ->mode_changed (e.g. in their ->atomic_check hooks if a
* plane update can't be done without a full modeset) _must_ call this function
* afterwards after that change. It is permitted to call this function multiple
* times for the same update, e.g. when the ->atomic_check functions depend upon
* the adjusted dotclock for fifo space allocation and watermark computation.
* Drivers which set &drm_crtc_state.mode_changed (e.g. in their
* &drm_plane_helper_funcs.atomic_check hooks if a plane update can't be done
* without a full modeset) _must_ call this function afterwards after that
* change. It is permitted to call this function multiple times for the same
* update, e.g. when the &drm_crtc_helper_funcs.atomic_check functions depend
* upon the adjusted dotclock for fifo space allocation and watermark
* computation.
*
* RETURNS:
* Zero for success or -errno
@ -584,9 +587,10 @@ EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
*
* Check the state object to see if the requested state is physically possible.
* This does all the plane update related checks using by calling into the
* ->atomic_check hooks provided by the driver.
* &drm_crtc_helper_funcs.atomic_check and &drm_plane_helper_funcs.atomic_check
* hooks provided by the driver.
*
* It also sets crtc_state->planes_changed to indicate that a crtc has
* It also sets &drm_crtc_state.planes_changed to indicate that a crtc has
* updated planes.
*
* RETURNS:
@ -648,14 +652,15 @@ EXPORT_SYMBOL(drm_atomic_helper_check_planes);
* Check the state object to see if the requested state is physically possible.
* Only crtcs and planes have check callbacks, so for any additional (global)
* checking that a driver needs it can simply wrap that around this function.
* Drivers without such needs can directly use this as their ->atomic_check()
* callback.
* Drivers without such needs can directly use this as their
* &drm_mode_config_funcs.atomic_check callback.
*
* This just wraps the two parts of the state checking for planes and modeset
* state in the default order: First it calls drm_atomic_helper_check_modeset()
* and then drm_atomic_helper_check_planes(). The assumption is that the
* ->atomic_check functions depend upon an updated adjusted_mode.clock to
* e.g. properly compute watermarks.
* @drm_plane_helper_funcs.atomic_check and @drm_crtc_helper_funcs.atomic_check
* functions depend upon an updated adjusted_mode.clock to e.g. properly compute
* watermarks.
*
* RETURNS:
* Zero for success or -errno
@ -1125,8 +1130,8 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
* drm_atomic_helper_commit_tail - commit atomic update to hardware
* @old_state: atomic state object with old state structures
*
* This is the default implemenation for the ->atomic_commit_tail() hook of the
* &drm_mode_config_helper_funcs vtable.
* This is the default implementation for the
* &drm_mode_config_helper_funcs.atomic_commit_tail hook.
*
* Note that the default ordering of how the various stages are called is to
* match the legacy modeset helper library closest. One peculiarity of that is
@ -1203,8 +1208,8 @@ static void commit_work(struct work_struct *work)
* drm_atomic_helper_setup_commit() and related functions.
*
* Committing the actual hardware state is done through the
* ->atomic_commit_tail() callback of the &drm_mode_config_helper_funcs vtable,
* or it's default implementation drm_atomic_helper_commit_tail().
* &drm_mode_config_helper_funcs.atomic_commit_tail callback, or it's default
* implementation drm_atomic_helper_commit_tail().
*
* RETURNS:
* Zero for success or -errno.
@ -1371,14 +1376,15 @@ static void release_crtc_commit(struct completion *completion)
*
* This function prepares @state to be used by the atomic helper's support for
* nonblocking commits. Drivers using the nonblocking commit infrastructure
* should always call this function from their ->atomic_commit hook.
* should always call this function from their
* &drm_mode_config_funcs.atomic_commit hook.
*
* To be able to use this support drivers need to use a few more helper
* functions. drm_atomic_helper_wait_for_dependencies() must be called before
* actually committing the hardware state, and for nonblocking commits this call
* must be placed in the async worker. See also drm_atomic_helper_swap_state()
* and it's stall parameter, for when a driver's commit hooks look at the
* ->state pointers of &struct drm_crtc, &drm_plane or &drm_connector directly.
* &drm_crtc.state, &drm_plane.state or &drm_connector.state pointer directly.
*
* Completion of the hardware commit step must be signalled using
* drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed
@ -1487,8 +1493,7 @@ static struct drm_crtc_commit *preceeding_commit(struct drm_crtc *crtc)
* This function waits for all preceeding commits that touch the same CRTC as
* @old_state to both be committed to the hardware (as signalled by
* drm_atomic_helper_commit_hw_done) and executed by the hardware (as signalled
* by calling drm_crtc_vblank_send_event on the event member of
* &drm_crtc_state).
* by calling drm_crtc_vblank_send_event() on the &drm_crtc_state.event).
*
* This is part of the atomic helper support for nonblocking commits, see
* drm_atomic_helper_setup_commit() for an overview.
@ -1625,8 +1630,9 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done);
* @state: atomic state object with new state structures
*
* This function prepares plane state, specifically framebuffers, for the new
* configuration. If any failure is encountered this function will call
* ->cleanup_fb on any already successfully prepared framebuffer.
* configuration, by calling &drm_plane_helper_funcs.prepare_fb. If any failure
* is encountered this function will call &drm_plane_helper_funcs.cleanup_fb on
* any already successfully prepared framebuffer.
*
* Returns:
* 0 on success, negative error code on failure.
@ -1706,10 +1712,10 @@ static bool plane_crtc_active(const struct drm_plane_state *state)
*
* Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant
* display controllers require to disable a CRTC's planes when the CRTC is
* disabled. This function would skip the ->atomic_disable call for a plane if
* the CRTC of the old plane state needs a modesetting operation. Of course,
* the drivers need to disable the planes in their CRTC disable callbacks
* since no one else would do that.
* disabled. This function would skip the &drm_plane_helper_funcs.atomic_disable
* call for a plane if the CRTC of the old plane state needs a modesetting
* operation. Of course, the drivers need to disable the planes in their CRTC
* disable callbacks since no one else would do that.
*
* The drm_atomic_helper_commit() default implementation doesn't set the
* ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers.
@ -1872,7 +1878,7 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc);
* planes.
*
* It is a bug to call this function without having implemented the
* ->atomic_disable() plane hook.
* &drm_plane_helper_funcs.atomic_disable plane hook.
*/
void
drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state,
@ -1959,8 +1965,8 @@ EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes);
* contains the old state. Also do any other cleanup required with that state.
*
* @stall must be set when nonblocking commits for this driver directly access
* the ->state pointer of &drm_plane, &drm_crtc or &drm_connector. With the
* current atomic helpers this is almost always the case, since the helpers
* the &drm_plane.state, &drm_crtc.state or &drm_connector.state pointer. With
* the current atomic helpers this is almost always the case, since the helpers
* don't pass the right state structures to the callbacks.
*/
void drm_atomic_helper_swap_state(struct drm_atomic_state *state,
@ -2890,8 +2896,8 @@ EXPORT_SYMBOL(drm_atomic_helper_page_flip_target);
*
* This is the main helper function provided by the atomic helper framework for
* implementing the legacy DPMS connector interface. It computes the new desired
* ->active state for the corresponding CRTC (if the connector is enabled) and
* updates it.
* &drm_crtc_state.active state for the corresponding CRTC (if the connector is
* enabled) and updates it.
*
* Returns:
* Returns 0 on success, negative errno numbers on failure.
@ -2963,11 +2969,11 @@ backoff:
EXPORT_SYMBOL(drm_atomic_helper_connector_dpms);
/**
* drm_atomic_helper_best_encoder - Helper for &drm_connector_helper_funcs
* ->best_encoder callback
* drm_atomic_helper_best_encoder - Helper for
* &drm_connector_helper_funcs.best_encoder callback
* @connector: Connector control structure
*
* This is a &drm_connector_helper_funcs ->best_encoder callback helper for
* This is a &drm_connector_helper_funcs.best_encoder callback helper for
* connectors that support exactly 1 encoder, statically determined at driver
* init time.
*/
@ -3001,7 +3007,7 @@ EXPORT_SYMBOL(drm_atomic_helper_best_encoder);
*/
/**
* drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs
* drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs
* @crtc: drm CRTC
*
* Resets the atomic state for @crtc by freeing the state pointer (which might
@ -3108,7 +3114,7 @@ void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
/**
* drm_atomic_helper_plane_reset - default ->reset hook for planes
* drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
* @plane: drm plane
*
* Resets the atomic state for @plane by freeing the state pointer (which might
@ -3212,8 +3218,9 @@ EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
* @conn_state: connector state to assign
*
* Initializes the newly allocated @conn_state and assigns it to
* #connector ->state, usually required when initializing the drivers
* or when called from the ->reset hook.
* the &drm_conector->state pointer of @connector, usually required when
* initializing the drivers or when called from the &drm_connector_funcs.reset
* hook.
*
* This is useful for drivers that subclass the connector state.
*/
@ -3229,7 +3236,7 @@ __drm_atomic_helper_connector_reset(struct drm_connector *connector,
EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
/**
* drm_atomic_helper_connector_reset - default ->reset hook for connectors
* drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
* @connector: drm connector
*
* Resets the atomic state for @connector by freeing the state pointer (which

28
drivers/gpu/drm/drm_crtc_helper.c
View File

@ -53,9 +53,9 @@
* configuration on resume with drm_helper_resume_force_mode().
*
* Note that this helper library doesn't track the current power state of CRTCs
* and encoders. It can call callbacks like ->dpms() even though the hardware is
* already in the desired state. This deficiency has been fixed in the atomic
* helpers.
* and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
* though the hardware is already in the desired state. This deficiency has been
* fixed in the atomic helpers.
*
* The driver callbacks are mostly compatible with the atomic modeset helpers,
* except for the handling of the primary plane: Atomic helpers require that the
@ -477,12 +477,12 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
* drm_crtc_helper_set_config - set a new config from userspace
* @set: mode set configuration
*
* The drm_crtc_helper_set_config() helper function implements the set_config
* callback of &struct drm_crtc_funcs for drivers using the legacy CRTC helpers.
* The drm_crtc_helper_set_config() helper function implements the of
* &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
* helpers.
*
* It first tries to locate the best encoder for each connector by calling the
* connector ->best_encoder() (&struct drm_connector_helper_funcs) helper
* operation.
* connector @drm_connector_helper_funcs.best_encoder helper operation.
*
* After locating the appropriate encoders, the helper function will call the
* mode_fixup encoder and CRTC helper operations to adjust the requested mode,
@ -493,8 +493,7 @@ drm_crtc_helper_disable(struct drm_crtc *crtc)
*
* If the adjusted mode is identical to the current mode but changes to the
* frame buffer need to be applied, the drm_crtc_helper_set_config() function
* will call the CRTC ->mode_set_base() (&struct drm_crtc_helper_funcs) helper
* operation.
* will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
*
* If the adjusted mode differs from the current mode, or if the
* ->mode_set_base() helper operation is not provided, the helper function
@ -851,14 +850,15 @@ static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
* @connector: affected connector
* @mode: DPMS mode
*
* The drm_helper_connector_dpms() helper function implements the ->dpms()
* callback of &struct drm_connector_funcs for drivers using the legacy CRTC helpers.
* The drm_helper_connector_dpms() helper function implements the
* &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
* helpers.
*
* This is the main helper function provided by the CRTC helper framework for
* implementing the DPMS connector attribute. It computes the new desired DPMS
* state for all encoders and CRTCs in the output mesh and calls the ->dpms()
* callbacks provided by the driver in &struct drm_crtc_helper_funcs and struct
* &drm_encoder_helper_funcs appropriately.
* state for all encoders and CRTCs in the output mesh and calls the
* &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
* provided by the driver.
*
* This function is deprecated. New drivers must implement atomic modeset
* support, for which this function is unsuitable. Instead drivers should use

2
drivers/gpu/drm/drm_dp_helper.c
View File

@ -725,7 +725,7 @@ MODULE_PARM_DESC(dp_aux_i2c_speed_khz,
/*
* Transfer a single I2C-over-AUX message and handle various error conditions,
* retrying the transaction as appropriate. It is assumed that the
* aux->transfer function does not modify anything in the msg other than the
* &drm_dp_aux.transfer function does not modify anything in the msg other than the
* reply field.
*
* Returns bytes transferred on success, or a negative error code on failure.

48
drivers/gpu/drm/drm_fb_helper.c
View File

@ -66,11 +66,11 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
* Teardown is done with drm_fb_helper_fini().
*
* At runtime drivers should restore the fbdev console by calling
* drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback.
* They should also notify the fb helper code from updates to the output
* configuration by calling drm_fb_helper_hotplug_event(). For easier
* drm_fb_helper_restore_fbdev_mode_unlocked() from their &drm_driver.lastclose
* callback. They should also notify the fb helper code from updates to the
* output configuration by calling drm_fb_helper_hotplug_event(). For easier
* integration with the output polling code in drm_crtc_helper.c the modeset
* code provides a ->output_poll_changed callback.
* code provides a &drm_mode_config_funcs.output_poll_changed callback.
*
* All other functions exported by the fb helper library can be used to
* implement the fbdev driver interface by the driver.
@ -79,7 +79,7 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
* hotplug detection using the fbdev helpers. The drm_fb_helper_prepare()
* helper must be called first to initialize the minimum required to make
* hotplug detection work. Drivers also need to make sure to properly set up
* the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init()
* the &drm_mode_config.funcs member. After calling drm_kms_helper_poll_init()
* it is safe to enable interrupts and start processing hotplug events. At the
* same time, drivers should initialize all modeset objects such as CRTCs,
* encoders and connectors. To finish up the fbdev helper initialization, the
@ -88,9 +88,9 @@ static DEFINE_MUTEX(kernel_fb_helper_lock);
* should call drm_fb_helper_single_add_all_connectors() followed by
* drm_fb_helper_initial_config().
*
* If &drm_framebuffer_funcs ->dirty is set, the
* If &drm_framebuffer_funcs.dirty is set, the
* drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will
* accumulate changes and schedule &drm_fb_helper ->dirty_work to run right
* accumulate changes and schedule &drm_fb_helper.dirty_work to run right
* away. This worker then calls the dirty() function ensuring that it will
* always run in process context since the fb_*() function could be running in
* atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io
@ -247,7 +247,7 @@ static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
}
/**
* drm_fb_helper_debug_enter - implementation for ->fb_debug_enter
* drm_fb_helper_debug_enter - implementation for &fb_ops.fb_debug_enter
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_enter(struct fb_info *info)
@ -296,7 +296,7 @@ static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
}
/**
* drm_fb_helper_debug_leave - implementation for ->fb_debug_leave
* drm_fb_helper_debug_leave - implementation for &fb_ops.fb_debug_leave
* @info: fbdev registered by the helper
*/
int drm_fb_helper_debug_leave(struct fb_info *info)
@ -445,7 +445,7 @@ static int restore_fbdev_mode(struct drm_fb_helper *fb_helper)
* drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration
* @fb_helper: fbcon to restore
*
* This should be called from driver's drm ->lastclose callback
* This should be called from driver's drm &drm_driver.lastclose callback
* when implementing an fbcon on top of kms using this helper. This ensures that
* the user isn't greeted with a black screen when e.g. X dies.
*
@ -585,7 +585,7 @@ static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode)
}
/**
* drm_fb_helper_blank - implementation for ->fb_blank
* drm_fb_helper_blank - implementation for &fb_ops.fb_blank
* @blank: desired blanking state
* @info: fbdev registered by the helper
*/
@ -912,7 +912,7 @@ static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y,
* @info: fb_info struct pointer
* @pagelist: list of dirty mmap framebuffer pages
*
* This function is used as the &fb_deferred_io ->deferred_io
* This function is used as the &fb_deferred_io.deferred_io
* callback function for flushing the fbdev mmap writes.
*/
void drm_fb_helper_deferred_io(struct fb_info *info,
@ -1103,7 +1103,7 @@ EXPORT_SYMBOL(drm_fb_helper_set_suspend);
* due to all the printk activity.
*
* This function can be called multiple times with the same state since
* &fb_info->state is checked to see if fbdev is running or not before locking.
* &fb_info.state is checked to see if fbdev is running or not before locking.
*
* Use drm_fb_helper_set_suspend() if you need to take the lock yourself.
*/
@ -1181,7 +1181,7 @@ static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
}
/**
* drm_fb_helper_setcmap - implementation for ->fb_setcmap
* drm_fb_helper_setcmap - implementation for &fb_ops.fb_setcmap
* @cmap: cmap to set
* @info: fbdev registered by the helper
*/
@ -1238,7 +1238,7 @@ int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
EXPORT_SYMBOL(drm_fb_helper_setcmap);
/**
* drm_fb_helper_check_var - implementation for ->fb_check_var
* drm_fb_helper_check_var - implementation for &fb_ops.fb_check_var
* @var: screeninfo to check
* @info: fbdev registered by the helper
*/
@ -1338,7 +1338,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
EXPORT_SYMBOL(drm_fb_helper_check_var);
/**
* drm_fb_helper_set_par - implementation for ->fb_set_par
* drm_fb_helper_set_par - implementation for &fb_ops.fb_set_par
* @info: fbdev registered by the helper
*
* This will let fbcon do the mode init and is called at initialization time by
@ -1422,7 +1422,7 @@ backoff:
}
/**
* drm_fb_helper_pan_display - implementation for ->fb_pan_display
* drm_fb_helper_pan_display - implementation for &fb_ops.fb_pan_display
* @var: updated screen information
* @info: fbdev registered by the helper
*/
@ -1607,7 +1607,7 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
* additional constraints need to set up their own limits.
*
* Drivers should call this (or their equivalent setup code) from their
* ->fb_probe callback.
* &drm_fb_helper_funcs.fb_probe callback.
*/
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
uint32_t depth)
@ -1636,11 +1636,11 @@ EXPORT_SYMBOL(drm_fb_helper_fill_fix);
* @fb_height: desired fb height
*
* Sets up the variable fbdev metainformation from the given fb helper instance
* and the drm framebuffer allocated in fb_helper->fb.
* and the drm framebuffer allocated in &drm_fb_helper.fb.
*
* Drivers should call this (or their equivalent setup code) from their
* ->fb_probe callback after having allocated the fbdev backing
* storage framebuffer.
* &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
* backing storage framebuffer.
*/
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
uint32_t fb_width, uint32_t fb_height)
@ -2207,9 +2207,9 @@ out:
* Note that this also registers the fbdev and so allows userspace to call into
* the driver through the fbdev interfaces.
*
* This function will call down into the ->fb_probe callback to let
* the driver allocate and initialize the fbdev info structure and the drm
* framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
* This function will call down into the &drm_fb_helper_funcs.fb_probe callback
* to let the driver allocate and initialize the fbdev info structure and the
* drm framebuffer used to back the fbdev. drm_fb_helper_fill_var() and
* drm_fb_helper_fill_fix() are provided as helpers to setup simple default
* values for the fbdev info structure.
*

9
drivers/gpu/drm/drm_plane_helper.c
View File

@ -39,9 +39,9 @@
*
* This helper library has two parts. The first part has support to implement
* primary plane support on top of the normal CRTC configuration interface.
* Since the legacy ->set_config interface ties the primary plane together with
* the CRTC state this does not allow userspace to disable the primary plane
* itself. To avoid too much duplicated code use
* Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
* plane together with the CRTC state this does not allow userspace to disable
* the primary plane itself. To avoid too much duplicated code use
* drm_plane_helper_check_update() which can be used to enforce the same
* restrictions as primary planes had thus. The default primary plane only
* expose XRBG8888 and ARGB8888 as valid pixel formats for the attached
@ -384,7 +384,8 @@ EXPORT_SYMBOL(drm_primary_helper_update);
* is called in response to a userspace SetPlane operation on the plane with a
* NULL framebuffer parameter. It unconditionally fails the disable call with
* -EINVAL the only way to disable the primary plane without driver support is
* to disable the entier CRTC. Which does not match the plane ->disable hook.
* to disable the entire CRTC. Which does not match the plane
* &drm_plane_funcs.disable_plane hook.
*
* Note that some hardware may be able to disable the primary plane without
* disabling the whole CRTC. Drivers for such hardware should provide their

14
drivers/gpu/drm/drm_probe_helper.c
View File

@ -43,7 +43,7 @@
* DOC: output probing helper overview
*
* This library provides some helper code for output probing. It provides an
* implementation of the core connector->fill_modes interface with
* implementation of the core &drm_connector_funcs.fill_modes interface with
* drm_helper_probe_single_connector_modes.
*
* It also provides support for polling connectors with a work item and for
@ -174,9 +174,9 @@ drm_connector_detect(struct drm_connector *connector, bool force)
* be added to the connector's probed_modes list, then culled (based on validity
* and the @maxX, @maxY parameters) and put into the normal modes list.
*
* Intended to be used as a generic implementation of the ->fill_modes()
* @connector vfunc for drivers that use the CRTC helpers for output mode
* filtering and detection.
* Intended to be used as a generic implementation of the
* &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers
* for output mode filtering and detection.
*
* The basic procedure is as follows
*
@ -188,7 +188,7 @@ drm_connector_detect(struct drm_connector *connector, bool force)
*
* - debugfs 'override_edid' (used for testing only)
* - firmware EDID (drm_load_edid_firmware())
* - connector helper ->get_modes() vfunc
* - &drm_connector_helper_funcs.get_modes vfunc
* - if the connector status is connector_status_connected, standard
* VESA DMT modes up to 1024x768 are automatically added
* (drm_add_modes_noedid())
@ -209,8 +209,8 @@ drm_connector_detect(struct drm_connector *connector, bool force)
* (if specified)
* - drm_mode_validate_flag() checks the modes againt basic connector
* capabilites (interlace_allowed,doublescan_allowed,stereo_allowed)
* - the optional connector ->mode_valid() helper can perform driver and/or
* hardware specific checks
* - the optional &drm_connector_helper_funcs.mode_valid helper can perform
* driver and/or hardware specific checks
*
* 5. Any mode whose status is not OK is pruned from the connector's modes list,
* accompanied by a debug message indicating the reason for the mode's

13
include/drm/drm_atomic_helper.h
View File

@ -177,7 +177,8 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
*
* This iterates over the current state, useful (for example) when applying
* atomic state after it has been checked and swapped. To iterate over the
* planes which *will* be attached (for ->atomic_check()) see
* planes which *will* be attached (more useful in code called from
* &drm_mode_config_funcs.atomic_check) see
* drm_atomic_crtc_state_for_each_plane().
*/
#define drm_atomic_crtc_for_each_plane(plane, crtc) \
@ -189,8 +190,9 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
* @crtc_state: the incoming crtc-state
*
* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
* attached if the specified state is applied. Useful during (for example)
* ->atomic_check() operations, to validate the incoming state.
* attached if the specified state is applied. Useful during for example
* in code called from &drm_mode_config_funcs.atomic_check operations, to
* validate the incoming state.
*/
#define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)
@ -202,8 +204,9 @@ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc,
* @crtc_state: the incoming crtc-state
*
* Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
* attached if the specified state is applied. Useful during (for example)
* ->atomic_check() operations, to validate the incoming state.
* attached if the specified state is applied. Useful during for example
* in code called from &drm_mode_config_funcs.atomic_check operations, to
* validate the incoming state.
*
* Compared to just drm_atomic_crtc_state_for_each_plane() this also fills in a
* const plane_state. This is useful when a driver just wants to peek at other

7
include/drm/drm_dp_mst_helper.h
View File

@ -493,8 +493,8 @@ struct drm_dp_mst_topology_mgr {
int total_pbn;
/**
* @qlock: protects @tx_msg_downq, the tx_slots in struct
* &drm_dp_mst_branch and txmsg->state once they are queued
* @qlock: protects @tx_msg_downq, the &drm_dp_mst_branch.txslost and
* &drm_dp_sideband_msg_tx.state once they are queued
*/
struct mutex qlock;
/**
@ -508,8 +508,7 @@ struct drm_dp_mst_topology_mgr {
struct mutex payload_lock;
/**
* @proposed_vcpis: Array of pointers for the new VCPI allocation. The
* VCPI structure itself is embedded into the corresponding
* &drm_dp_mst_port structure.
* VCPI structure itself is &drm_dp_mst_port.vcpi.
*/
struct drm_dp_vcpi **proposed_vcpis;
/**

2
include/drm/drm_flip_work.h
View File

@ -54,7 +54,7 @@ typedef void (*drm_flip_func_t)(struct drm_flip_work *work, void *val);
/**
* struct drm_flip_task - flip work task
* @node: list entry element
* @data: data to pass to work->func
* @data: data to pass to &drm_flip_work.func
*/
struct drm_flip_task {
struct list_head node;

146
include/drm/drm_modeset_helper_vtables.h
View File

@ -111,9 +111,9 @@ struct drm_crtc_helper_funcs {
* This callback is used to validate a mode. The parameter mode is the
* display mode that userspace requested, adjusted_mode is the mode the
* encoders need to be fed with. Note that this is the inverse semantics
* of the meaning for the &drm_encoder and &drm_bridge
* ->mode_fixup() functions. If the CRTC cannot support the requested
* conversion from mode to adjusted_mode it should reject the modeset.
* of the meaning for the &drm_encoder and &drm_bridge_funcs.mode_fixup
* vfunc. If the CRTC cannot support the requested conversion from mode
* to adjusted_mode it should reject the modeset.
*
* This function is used by both legacy CRTC helpers and atomic helpers.
* With atomic helpers it is optional.
@ -134,17 +134,18 @@ struct drm_crtc_helper_funcs {
*
* Also beware that neither core nor helpers filter modes before
* passing them to the driver: While the list of modes that is
* advertised to userspace is filtered using the connector's
* ->mode_valid() callback, neither the core nor the helpers do any
* filtering on modes passed in from userspace when setting a mode. It
* is therefore possible for userspace to pass in a mode that was
* previously filtered out using ->mode_valid() or add a custom mode
* that wasn't probed from EDID or similar to begin with. Even though
* this is an advanced feature and rarely used nowadays, some users rely
* on being able to specify modes manually so drivers must be prepared
* to deal with it. Specifically this means that all drivers need not
* only validate modes in ->mode_valid() but also in ->mode_fixup() to
* make sure invalid modes passed in from userspace are rejected.
* advertised to userspace is filtered using the
* &drm_connector.mode_valid callback, neither the core nor the helpers
* do any filtering on modes passed in from userspace when setting a
* mode. It is therefore possible for userspace to pass in a mode that
* was previously filtered out using &drm_connector.mode_valid or add a
* custom mode that wasn't probed from EDID or similar to begin with.
* Even though this is an advanced feature and rarely used nowadays,
* some users rely on being able to specify modes manually so drivers
* must be prepared to deal with it. Specifically this means that all
* drivers need not only validate modes in &drm_connector.mode_valid but
* also in this or in the &drm_encoder_helper_funcs.mode_fixup callback
* to make sure invalid modes passed in from userspace are rejected.
*
* RETURNS:
*
@ -205,7 +206,7 @@ struct drm_crtc_helper_funcs {
* optimized fast-path instead of a full mode set operation with all the
* resulting flickering. If it is not present
* drm_crtc_helper_set_config() will fall back to a full modeset, using
* the ->mode_set() callback. Since it can't update other planes it's
* the @mode_set callback. Since it can't update other planes it's
* incompatible with atomic modeset support.
*
* This callback is only used by the CRTC helpers and deprecated.
@ -238,8 +239,7 @@ struct drm_crtc_helper_funcs {
/**
* @load_lut:
*
* Load a LUT prepared with the @gamma_set functions from
* &drm_fb_helper_funcs.
* Load a LUT prepared with the &drm_fb_helper_funcs.gamma_set vfunc.
*
* This callback is optional and is only used by the fbdev emulation
* helpers.
@ -257,10 +257,11 @@ struct drm_crtc_helper_funcs {
*
* This callback should be used to disable the CRTC. With the atomic
* drivers it is called after all encoders connected to this CRTC have
* been shut off already using their own ->disable hook. If that
* sequence is too simple drivers can just add their own hooks and call
* it from this CRTC callback here by looping over all encoders
* connected to it using for_each_encoder_on_crtc().
* been shut off already using their own
* &drm_encoder_helper_funcs.disable hook. If that sequence is too
* simple drivers can just add their own hooks and call it from this
* CRTC callback here by looping over all encoders connected to it using
* for_each_encoder_on_crtc().
*
* This hook is used both by legacy CRTC helpers and atomic helpers.
* Atomic drivers don't need to implement it if there's no need to
@ -289,10 +290,10 @@ struct drm_crtc_helper_funcs {
*
* This callback should be used to enable the CRTC. With the atomic
* drivers it is called before all encoders connected to this CRTC are
* enabled through the encoder's own ->enable hook. If that sequence is
* too simple drivers can just add their own hooks and call it from this
* CRTC callback here by looping over all encoders connected to it using
* for_each_encoder_on_crtc().
* enabled through the encoder's own &drm_encoder_helper_funcs.enable
* hook. If that sequence is too simple drivers can just add their own
* hooks and call it from this CRTC callback here by looping over all
* encoders connected to it using for_each_encoder_on_crtc().
*
* This hook is used only by atomic helpers, for symmetry with @disable.
* Atomic drivers don't need to implement it if there's no need to
@ -316,16 +317,16 @@ struct drm_crtc_helper_funcs {
* beforehand. This is calling order used by the default helper
* implementation in drm_atomic_helper_check().
*
* When using drm_atomic_helper_check_planes() CRTCs' ->atomic_check()
* hooks are called after the ones for planes, which allows drivers to
* assign shared resources requested by planes in the CRTC callback
* here. For more complicated dependencies the driver can call the provided
* check helpers multiple times until the computed state has a final
* configuration and everything has been checked.
* When using drm_atomic_helper_check_planes() this hook is called
* after the &drm_plane_helper_funcs.atomc_check hook for planes, which
* allows drivers to assign shared resources requested by planes in this
* callback here. For more complicated dependencies the driver can call
* the provided check helpers multiple times until the computed state
* has a final configuration and everything has been checked.
*
* This function is also allowed to inspect any other object's state and
* can add more state objects to the atomic commit if needed. Care must
* be taken though to ensure that state check&compute functions for
* be taken though to ensure that state check and compute functions for
* these added states are all called, and derived state in other objects
* all updated. Again the recommendation is to just call check helpers
* until a maximal configuration is reached.
@ -400,10 +401,11 @@ struct drm_crtc_helper_funcs {
*
* This callback should be used to disable the CRTC. With the atomic
* drivers it is called after all encoders connected to this CRTC have
* been shut off already using their own ->disable hook. If that
* sequence is too simple drivers can just add their own hooks and call
* it from this CRTC callback here by looping over all encoders
* connected to it using for_each_encoder_on_crtc().
* been shut off already using their own
* &drm_encoder_helper_funcs.disable hook. If that sequence is too
* simple drivers can just add their own hooks and call it from this
* CRTC callback here by looping over all encoders connected to it using
* for_each_encoder_on_crtc().
*
* This hook is used only by atomic helpers. Atomic drivers don't
* need to implement it if there's no need to disable anything at the
@ -483,16 +485,18 @@ struct drm_encoder_helper_funcs {
* Also beware that neither core nor helpers filter modes before
* passing them to the driver: While the list of modes that is
* advertised to userspace is filtered using the connector's
* ->mode_valid() callback, neither the core nor the helpers do any
* filtering on modes passed in from userspace when setting a mode. It
* is therefore possible for userspace to pass in a mode that was
* previously filtered out using ->mode_valid() or add a custom mode
* that wasn't probed from EDID or similar to begin with. Even though
* this is an advanced feature and rarely used nowadays, some users rely
* on being able to specify modes manually so drivers must be prepared
* to deal with it. Specifically this means that all drivers need not
* only validate modes in ->mode_valid() but also in ->mode_fixup() to
* make sure invalid modes passed in from userspace are rejected.
* &drm_connector_helper_funcs.mode_valid callback, neither the core nor
* the helpers do any filtering on modes passed in from userspace when
* setting a mode. It is therefore possible for userspace to pass in a
* mode that was previously filtered out using
* &drm_connector_helper_funcs.mode_valid or add a custom mode that
* wasn't probed from EDID or similar to begin with. Even though this
* is an advanced feature and rarely used nowadays, some users rely on
* being able to specify modes manually so drivers must be prepared to
* deal with it. Specifically this means that all drivers need not only
* validate modes in &drm_connector.mode_valid but also in this or in
* the &drm_crtc_helper_funcs.mode_fixup callback to make sure
* invalid modes passed in from userspace are rejected.
*
* RETURNS:
*
@ -544,7 +548,7 @@ struct drm_encoder_helper_funcs {
* use this hook, because the helper library calls it only once and not
* every time the display pipeline is suspend using either DPMS or the
* new "ACTIVE" property. Such drivers should instead move all their
* encoder setup into the ->enable() callback.
* encoder setup into the @enable callback.
*
* This callback is used both by the legacy CRTC helpers and the atomic
* modeset helpers. It is optional in the atomic helpers.
@ -570,7 +574,7 @@ struct drm_encoder_helper_funcs {
* use this hook, because the helper library calls it only once and not
* every time the display pipeline is suspended using either DPMS or the
* new "ACTIVE" property. Such drivers should instead move all their
* encoder setup into the ->enable() callback.
* encoder setup into the @enable callback.
*
* This callback is used by the atomic modeset helpers in place of the
* @mode_set callback, if set by the driver. It is optional and should
@ -621,10 +625,10 @@ struct drm_encoder_helper_funcs {
*
* This callback should be used to disable the encoder. With the atomic
* drivers it is called before this encoder's CRTC has been shut off
* using the CRTC's own ->disable hook. If that sequence is too simple
* drivers can just add their own driver private encoder hooks and call
* them from CRTC's callback by looping over all encoders connected to
* it using for_each_encoder_on_crtc().
* using their own &drm_crtc_helper_funcs.disable hook. If that
* sequence is too simple drivers can just add their own driver private
* encoder hooks and call them from CRTC's callback by looping over all
* encoders connected to it using for_each_encoder_on_crtc().
*
* This hook is used both by legacy CRTC helpers and atomic helpers.
* Atomic drivers don't need to implement it if there's no need to
@ -651,10 +655,10 @@ struct drm_encoder_helper_funcs {
*
* This callback should be used to enable the encoder. With the atomic
* drivers it is called after this encoder's CRTC has been enabled using
* the CRTC's own ->enable hook. If that sequence is too simple drivers
* can just add their own driver private encoder hooks and call them
* from CRTC's callback by looping over all encoders connected to it
* using for_each_encoder_on_crtc().
* their own &drm_crtc_helper_funcs.enable hook. If that sequence is
* too simple drivers can just add their own driver private encoder
* hooks and call them from CRTC's callback by looping over all encoders
* connected to it using for_each_encoder_on_crtc().
*
* This hook is used only by atomic helpers, for symmetry with @disable.
* Atomic drivers don't need to implement it if there's no need to
@ -716,7 +720,7 @@ struct drm_connector_helper_funcs {
* @get_modes:
*
* This function should fill in all modes currently valid for the sink
* into the connector->probed_modes list. It should also update the
* into the &drm_connector.probed_modes list. It should also update the
* EDID property by calling drm_mode_connector_update_edid_property().
*
* The usual way to implement this is to cache the EDID retrieved in the
@ -725,8 +729,9 @@ struct drm_connector_helper_funcs {
* them by calling drm_add_edid_modes(). But connectors that driver a
* fixed panel can also manually add specific modes using
* drm_mode_probed_add(). Drivers which manually add modes should also
* make sure that the @display_info, @width_mm and @height_mm fields of the
* &struct drm_connector are filled in.
* make sure that the &drm_connector.display_info,
* &drm_connector.width_mm and &drm_connector.height_mm fields are
* filled in.
*
* Virtual drivers that just want some standard VESA mode with a given
* resolution can call drm_add_modes_noedid(), and mark the preferred
@ -735,7 +740,7 @@ struct drm_connector_helper_funcs {
* Finally drivers that support audio probably want to update the ELD
* data, too, using drm_edid_to_eld().
*
* This function is only called after the ->detect() hook has indicated
* This function is only called after the @detect hook has indicated
* that a sink is connected and when the EDID isn't overridden through
* sysfs or the kernel commandline.
*
@ -768,8 +773,8 @@ struct drm_connector_helper_funcs {
*
* RETURNS:
*
* Either MODE_OK or one of the failure reasons in enum
* &drm_mode_status.
* Either &drm_mode_status.MODE_OK or one of the failure reasons in &enum
* drm_mode_status.
*/
enum drm_mode_status (*mode_valid)(struct drm_connector *connector,
struct drm_display_mode *mode);
@ -875,7 +880,7 @@ struct drm_plane_helper_funcs {
* RETURNS:
*
* 0 on success or one of the following negative error codes allowed by
* the atomic_commit hook in &drm_mode_config_funcs. When using helpers
* the &drm_mode_config_funcs.atomic_commit vfunc. When using helpers
* this callback is the only one which can fail an atomic commit,
* everything else must complete successfully.
*/
@ -898,7 +903,7 @@ struct drm_plane_helper_funcs {
*
* Drivers should check plane specific constraints in this hook.
*
* When using drm_atomic_helper_check_planes() plane's ->atomic_check()
* When using drm_atomic_helper_check_planes() plane's @atomic_check
* hooks are called before the ones for CRTCs, which allows drivers to
* request shared resources that the CRTC controls here. For more
* complicated dependencies the driver can call the provided check helpers
@ -907,7 +912,7 @@ struct drm_plane_helper_funcs {
*
* This function is also allowed to inspect any other object's state and
* can add more state objects to the atomic commit if needed. Care must
* be taken though to ensure that state check&compute functions for
* be taken though to ensure that state check and compute functions for
* these added states are all called, and derived state in other objects
* all updated. Again the recommendation is to just call check helpers
* until a maximal configuration is reached.
@ -936,8 +941,8 @@ struct drm_plane_helper_funcs {
* @atomic_update:
*
* Drivers should use this function to update the plane state. This
* hook is called in-between the ->atomic_begin() and
* ->atomic_flush() of &drm_crtc_helper_funcs.
* hook is called in-between the &drm_crtc_helper_funcs.atomic_begin and
* drm_crtc_helper_funcs.atomic_flush callbacks.
*
* Note that the power state of the display pipe when this function is
* called depends upon the exact helpers and calling sequence the driver
@ -953,14 +958,15 @@ struct drm_plane_helper_funcs {
* @atomic_disable:
*
* Drivers should use this function to unconditionally disable a plane.
* This hook is called in-between the ->atomic_begin() and
* ->atomic_flush() of &drm_crtc_helper_funcs. It is an alternative to
* This hook is called in-between the
* &drm_crtc_helper_funcs.atomic_begin and
* drm_crtc_helper_funcs.atomic_flush callbacks. It is an alternative to
* @atomic_update, which will be called for disabling planes, too, if
* the @atomic_disable hook isn't implemented.
*
* This hook is also useful to disable planes in preparation of a modeset,
* by calling drm_atomic_helper_disable_planes_on_crtc() from the
* ->disable() hook in &drm_crtc_helper_funcs.
* &drm_crtc_helper_funcs.disable hook.
*
* Note that the power state of the display pipe when this function is
* called depends upon the exact helpers and calling sequence the driver

12
include/drm/drm_simple_kms_helper.h
View File

@ -77,9 +77,9 @@ struct drm_simple_display_pipe_funcs {
/**
* @prepare_fb:
*
* Optional, called by &struct drm_plane_helper_funcs ->prepare_fb .
* Please read the documentation for the ->prepare_fb hook in
* &struct drm_plane_helper_funcs for more details.
* Optional, called by &drm_plane_helper_funcs.prepare_fb. Please read
* the documentation for the &drm_plane_helper_funcs.prepare_fb hook for
* more details.
*/
int (*prepare_fb)(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);
@ -87,9 +87,9 @@ struct drm_simple_display_pipe_funcs {
/**
* @cleanup_fb:
*
* Optional, called by &struct drm_plane_helper_funcs ->cleanup_fb .
* Please read the documentation for the ->cleanup_fb hook in
* &struct drm_plane_helper_funcs for more details.
* Optional, called by &drm_plane_helper_funcs.cleanup_fb. Please read
* the documentation for the &drm_plane_helper_funcs.cleanup_fb hook for
* more details.
*/
void (*cleanup_fb)(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);