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drm: Add drm_atomic_set_mode_for_crtc

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Add a new helper, to be used later for blob property management, that
sets the mode for a CRTC state, as well as updating the CRTC enable/active
state at the same time.

v2: Do not touch active/mode_changed in CRTC state. Document return
    value. Remove stray drm_atomic_set_mode_prop_for_crtc declaration.

v3: Remove i915 changes, and leave it directly bashing crtc_state->mode
    for the meantime.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Tested-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Stone
2015-05-26 14:36:48 +01:00
committed by Daniel Vetter
parent bbe16a40e2
commit 819364da20
4 changed files with 50 additions and 5 deletions
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36
drivers/gpu/drm/drm_atomic.c
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@ -289,6 +289,42 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
}
EXPORT_SYMBOL(drm_atomic_get_crtc_state);
/**
* drm_atomic_set_mode_for_crtc - set mode for CRTC
* @state: the CRTC whose incoming state to update
* @mode: kernel-internal mode to use for the CRTC, or NULL to disable
*
* Set a mode (originating from the kernel) on the desired CRTC state. Does
* not change any other state properties, including enable, active, or
* mode_changed.
*
* RETURNS:
* Zero on success, error code on failure. Cannot return -EDEADLK.
*/
int drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
struct drm_display_mode *mode)
{
/* Early return for no change. */
if (mode && memcmp(&state->mode, mode, sizeof(*mode)) == 0)
return 0;
if (mode) {
drm_mode_copy(&state->mode, mode);
state->enable = true;
DRM_DEBUG_ATOMIC("Set [MODE:%s] for CRTC state %p\n",
mode->name, state);
} else {
memset(&state->mode, 0, sizeof(state->mode));
state->enable = false;
DRM_DEBUG_ATOMIC("Set [NOMODE] for CRTC state %p\n",
state);
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
/**
* drm_atomic_crtc_set_property - set property on CRTC
* @crtc: the drm CRTC to set a property on