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drm/i915: flip on a no fb -> fb transition if crtc is active v3

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If the crtc is active, we can simply flip a new fb onto it, provided the
other mode setting reqs are met.  Otherwise, we'll need to do a full
mode set to re-enable the crtc.

v2: check for crtc active and set mode_changed accordingly
v3: add module parameter, i915.fastboot, to control no fb -> fb flip behavior

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2013-06-26 01:38:19 +03:00 committed by Daniel Vetter
parent 4d6a3e63bc
commit 319d9827eb
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/i915/intel_display.c
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@ -8676,8 +8676,16 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
} else if (set->crtc->fb != set->fb) {
/* If we have no fb then treat it as a full mode set */
if (set->crtc->fb == NULL) {
DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
config->mode_changed = true;
struct intel_crtc *intel_crtc =
to_intel_crtc(set->crtc);
if (intel_crtc->active && i915_fastboot) {
DRM_DEBUG_KMS("crtc has no fb, will flip\n");
config->fb_changed = true;
} else {
DRM_DEBUG_KMS("inactive crtc, full mode set\n");
config->mode_changed = true;
}
} else if (set->fb == NULL) {
config->mode_changed = true;
} else if (set->fb->pixel_format !=