drm/i915: add missing intel_enable_plane() call to i9xx_crtc_mode_set()

From: Melchior FRANZ <[email protected]>

Fix garbled up virtual linux console on Acer TM 5735Z-452G32Mnss (colored stripes, unreadable text) by adding the intel_enable_plane() call also to i9xx_crtc_mode_set(), which didn't inherit it from intel_crtc_mode_set() like its twin ironlake_crtc_mode_set().

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The bug was originally introduced with 49183b2818 and fixed with 982b2035d9, but re-introduced by a recent drm/i915 branch merge.

index f553ddf..5d20579 100644
@@ -4735,6 +4735,8 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
 
 	I915_WRITE(DSPCNTR(plane), dspcntr);
 	POSTING_READ(DSPCNTR(plane));
+	if (!HAS_PCH_SPLIT(dev))
+		intel_enable_plane(dev_priv, plane, pipe);
 
 	ret = intel_pipe_set_base(crtc, x, y, old_fb);