drm/i915: flip on a no fb -> fb transition if crtc is active v3 (319d9827) · Commits · 戴 / test

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>

drivers/gpu/drm/i915/intel_display.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -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");
		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 !=

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