Commit 6c4789ed authored by Daniel Vetter's avatar Daniel Vetter

drm: Clean up kerneldoc for struct drm_driver

Just cleans up what's there, still plenty missing.
Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161114115825.22050-6-daniel.vetter@ffwll.ch
parent 85e634bc
......@@ -143,6 +143,9 @@ Device Instance and Driver Handling
.. kernel-doc:: drivers/gpu/drm/drm_drv.c
:export:
.. kernel-doc:: include/drm/drm_drv.h
:internal:
Driver Load
-----------
......
......@@ -77,92 +77,110 @@ struct drm_driver {
int (*set_busid)(struct drm_device *dev, struct drm_master *master);
/**
* get_vblank_counter - get raw hardware vblank counter
* @dev: DRM device
* @pipe: counter to fetch
* @get_vblank_counter:
*
* Driver callback for fetching a raw hardware vblank counter for @crtc.
* If a device doesn't have a hardware counter, the driver can simply
* use drm_vblank_no_hw_counter() function. The DRM core will account for
* Driver callback for fetching a raw hardware vblank counter for the
* CRTC specified with the pipe argument. If a device doesn't have a
* hardware counter, the driver can simply use
* drm_vblank_no_hw_counter() function. The DRM core will account for
* missed vblank events while interrupts where disabled based on system
* timestamps.
*
* Wraparound handling and loss of events due to modesetting is dealt
* with in the DRM core code.
* with in the DRM core code, as long as drivers call
* drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
* enabling a CRTC.
*
* Returns:
*
* RETURNS
* Raw vblank counter value.
*/
u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
/**
* enable_vblank - enable vblank interrupt events
* @dev: DRM device
* @pipe: which irq to enable
* @enable_vblank:
*
* Enable vblank interrupts for the CRTC specified with the pipe
* argument.
*
* Enable vblank interrupts for @crtc. If the device doesn't have
* a hardware vblank counter, the driver should use the
* drm_vblank_no_hw_counter() function that keeps a virtual counter.
* Returns:
*
* RETURNS
* Zero on success, appropriate errno if the given @crtc's vblank
* interrupt cannot be enabled.
*/
int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
/**
* disable_vblank - disable vblank interrupt events
* @dev: DRM device
* @pipe: which irq to enable
* @disable_vblank:
*
* Disable vblank interrupts for @crtc. If the device doesn't have
* a hardware vblank counter, the driver should use the
* drm_vblank_no_hw_counter() function that keeps a virtual counter.
* Disable vblank interrupts for the CRTC specified with the pipe
* argument.
*/
void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
/**
* Called by \c drm_device_is_agp. Typically used to determine if a
* card is really attached to AGP or not.
* @device_is_agp:
*
* Called by drm_device_is_agp(). Typically used to determine if a card
* is really attached to AGP or not.
*
* \param dev DRM device handle
* Returns:
*
* \returns
* One of three values is returned depending on whether or not the
* card is absolutely \b not AGP (return of 0), absolutely \b is AGP
* card is absolutely not AGP (return of 0), absolutely is AGP
* (return of 1), or may or may not be AGP (return of 2).
*/
int (*device_is_agp) (struct drm_device *dev);
/**
* @get_scanout_position:
*
* Called by vblank timestamping code.
*
* Return the current display scanout position from a crtc, and an
* optional accurate ktime_get timestamp of when position was measured.
* Returns the current display scanout position from a crtc, and an
* optional accurate ktime_get() timestamp of when position was
* measured. Note that this is a helper callback which is only used if a
* driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
* @get_vblank_timestamp callback.
*
* Parameters:
*
* \param dev DRM device.
* \param pipe Id of the crtc to query.
* \param flags Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
* \param *vpos Target location for current vertical scanout position.
* \param *hpos Target location for current horizontal scanout position.
* \param *stime Target location for timestamp taken immediately before
* dev:
* DRM device.
* pipe:
* Id of the crtc to query.
* flags:
* Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
* vpos:
* Target location for current vertical scanout position.
* hpos:
* Target location for current horizontal scanout position.
* stime:
* Target location for timestamp taken immediately before
* scanout position query. Can be NULL to skip timestamp.
* \param *etime Target location for timestamp taken immediately after
* etime:
* Target location for timestamp taken immediately after
* scanout position query. Can be NULL to skip timestamp.
* \param mode Current display timings.
* mode:
* Current display timings.
*
* Returns vpos as a positive number while in active scanout area.
* Returns vpos as a negative number inside vblank, counting the number
* of scanlines to go until end of vblank, e.g., -1 means "one scanline
* until start of active scanout / end of vblank."
*
* \return Flags, or'ed together as follows:
* Returns:
*
* Flags, or'ed together as follows:
*
* DRM_SCANOUTPOS_VALID = Query successful.
* DRM_SCANOUTPOS_INVBL = Inside vblank.
* DRM_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
* this flag means that returned position may be offset by a constant
* but unknown small number of scanlines wrt. real scanout position.
* DRM_SCANOUTPOS_VALID:
* Query successful.
* DRM_SCANOUTPOS_INVBL:
* Inside vblank.
* DRM_SCANOUTPOS_ACCURATE: Returned position is accurate. A lack of
* this flag means that returned position may be offset by a
* constant but unknown small number of scanlines wrt. real scanout
* position.
*
*/
int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
......@@ -171,7 +189,9 @@ struct drm_driver {
const struct drm_display_mode *mode);
/**
* Called by \c drm_get_last_vbltimestamp. Should return a precise
* @get_vblank_timestamp:
*
* Called by drm_get_last_vbltimestamp(). Should return a precise
* timestamp when the most recent VBLANK interval ended or will end.
*
* Specifically, the timestamp in @vblank_time should correspond as
......@@ -183,19 +203,27 @@ struct drm_driver {
* past start time of the current scanout. This is meant to adhere
* to the OpenML OML_sync_control extension specification.
*
* \param dev dev DRM device handle.
* \param pipe crtc for which timestamp should be returned.
* \param *max_error Maximum allowable timestamp error in nanoseconds.
* Paramters:
*
* dev:
* dev DRM device handle.
* pipe:
* crtc for which timestamp should be returned.
* max_error:
* Maximum allowable timestamp error in nanoseconds.
* Implementation should strive to provide timestamp
* with an error of at most *max_error nanoseconds.
* with an error of at most max_error nanoseconds.
* Returns true upper bound on error for timestamp.
* \param *vblank_time Target location for returned vblank timestamp.
* \param flags 0 = Defaults, no special treatment needed.
* \param DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
* vblank_time:
* Target location for returned vblank timestamp.
* flags:
* 0 = Defaults, no special treatment needed.
* DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
* irq handler. Some drivers need to apply some workarounds
* for gpu-specific vblank irq quirks if flag is set.
*
* \returns
* Returns:
*
* Zero if timestamping isn't supported in current display mode or a
* negative number on failure. A positive status code on success,
* which describes how the vblank_time timestamp was computed.
......@@ -212,16 +240,32 @@ struct drm_driver {
int (*irq_postinstall) (struct drm_device *dev);
void (*irq_uninstall) (struct drm_device *dev);
/* Master routines */
/**
* @master_create:
*
* Called whenever a new master is created. Only used by vmwgfx.
*/
int (*master_create)(struct drm_device *dev, struct drm_master *master);
void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
/**
* master_set is called whenever the minor master is set.
* master_drop is called whenever the minor master is dropped.
* @master_destroy:
*
* Called whenever a master is destroyed. Only used by vmwgfx.
*/
void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
/**
* @master_set:
*
* Called whenever the minor master is set. Only used by vmwgfx.
*/
int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
bool from_open);
/**
* @master_drop:
*
* Called whenever the minor master is dropped. Only used by vmwgfx.
*/
void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
int (*debugfs_init)(struct drm_minor *minor);
......
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