From 3fa5b3998353518c40e2fb0c28b425ee22c8d625 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Wed, 13 Dec 2006 11:54:36 -0800
Subject: [PATCH] Add magic double-write of the dpll register to fix mac mini
 cold boot.

---
 src/i830_display.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/i830_display.c b/src/i830_display.c
index c111145e..37a6e32e 100644
--- a/src/i830_display.c
+++ b/src/i830_display.c
@@ -758,6 +758,15 @@ i830_crtc_mode_set(xf86CrtcPtr crtc, DisplayModePtr mode,
 
     OUTREG(fp_reg, fp);
     OUTREG(dpll_reg, dpll);
+
+    /* Magic re-write of the register for the Mac Mini.  Without this, the
+     * first X invocation after a cold boot will stick in 4x pixel multiply
+     * mode.  Alternatives that don't work include sleeping and doing an
+     * INREG for presumable pci write posting magic before and after the dpll
+     * write above.
+     */
+    OUTREG(dpll_reg, dpll);
+
     if (IS_I965G(pI830)) {
 	int sdvo_pixel_multiply = adjusted_mode->Clock / mode->Clock;
 	OUTREG(dpll_md_reg, (0 << DPLL_MD_UDI_DIVIDER_SHIFT) |