struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct drm_display_mode adjusted_mode;
+ int vmax_vblank_start = 0;
+ unsigned long irqflags;
drm_mode_init(&adjusted_mode, &crtc_state->hw.adjusted_mode);
adjusted_mode.crtc_vtotal = crtc_state->vrr.vmax;
adjusted_mode.crtc_vblank_end = crtc_state->vrr.vmax;
adjusted_mode.crtc_vblank_start = intel_vrr_vmin_vblank_start(crtc_state);
- crtc->vmax_vblank_start = intel_vrr_vmax_vblank_start(crtc_state);
+ vmax_vblank_start = intel_vrr_vmax_vblank_start(crtc_state);
}
+ /*
+ * Belts and suspenders locking to guarantee everyone sees 100%
+ * consistent state during fastset seamless refresh rate changes.
+ *
+ * vblank_time_lock takes care of all drm_vblank.c stuff, and
+ * uncore.lock takes care of __intel_get_crtc_scanline() which
+ * may get called elsewhere as well.
+ *
+ * TODO maybe just protect everything (including
+ * __intel_get_crtc_scanline()) with vblank_time_lock?
+ * Need to audit everything to make sure it's safe.
+ */
+ spin_lock_irqsave(&dev_priv->drm.vblank_time_lock, irqflags);
+ spin_lock(&dev_priv->uncore.lock);
+
drm_calc_timestamping_constants(&crtc->base, &adjusted_mode);
+ crtc->vmax_vblank_start = vmax_vblank_start;
+
crtc->mode_flags = crtc_state->mode_flags;
/*
} else {
crtc->scanline_offset = 1;
}
+
+ spin_unlock(&dev_priv->uncore.lock);
+ spin_unlock_irqrestore(&dev_priv->drm.vblank_time_lock, irqflags);
}
/*