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drm/atomic-helper: Export both plane and modeset check helpers

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The default call sequence for these two parts won't fit for all
drivers. So export the two pieces and explain with a bit of kerneldoc
when each should be called.

v2: Squash in fixup from Rob to actually add the newly exported
functions to headers

Cc: Rob Clark <robdclark@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter
2014-11-26 16:57:41 +01:00
parent 4b08eae52f
commit d9b13620fa
3 changed files with 69 additions and 8 deletions
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65
drivers/gpu/drm/drm_atomic_helper.c
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@@ -330,7 +330,29 @@ mode_fixup(struct drm_atomic_state *state)
return 0;
}
static int
/**
* drm_atomic_helper_check - validate state object for modeset changes
* @dev: DRM device
* @state: the driver state object
*
* 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. It computes and updates crtc_state->mode_changed, adds any additional
* connectors needed for full modesets and calls down into ->mode_fixup
* functions of the driver backend.
*
* IMPORTANT:
*
* Drivers which update ->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.
*
* RETURNS
* Zero for success or -errno
*/
int
drm_atomic_helper_check_modeset(struct drm_device *dev,
struct drm_atomic_state *state)
{
@@ -406,23 +428,23 @@ drm_atomic_helper_check_modeset(struct drm_device *dev,
return mode_fixup(state);
}
EXPORT_SYMBOL(drm_atomic_helper_check_modeset);
/**
* drm_atomic_helper_check - validate state object
* drm_atomic_helper_check - validate state object for modeset changes
* @dev: DRM device
* @state: the driver state object
*
* 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.
* This does all the plane update related checks using by calling into the
* ->atomic_check hooks provided by the driver.
*
* RETURNS
* Zero for success or -errno
*/
int drm_atomic_helper_check(struct drm_device *dev,
struct drm_atomic_state *state)
int
drm_atomic_helper_check_planes(struct drm_device *dev,
struct drm_atomic_state *state)
{
int nplanes = dev->mode_config.num_total_plane;
int ncrtcs = dev->mode_config.num_crtc;
@@ -471,6 +493,33 @@ int drm_atomic_helper_check(struct drm_device *dev,
}
}
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_check_planes);
/**
* drm_atomic_helper_check - validate state object
* @dev: DRM device
* @state: the driver state object
*
* 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.
*
* RETURNS
* Zero for success or -errno
*/
int drm_atomic_helper_check(struct drm_device *dev,
struct drm_atomic_state *state)
{
int ret;
ret = drm_atomic_helper_check_planes(dev, state);
if (ret)
return ret;
ret = drm_atomic_helper_check_modeset(dev, state);
if (ret)
return ret;