From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sat, 7 Aug 2010 10:01:36 +0000 (+0100)
Subject: drm/i915/edp: Flush the write before waiting for PLLs
X-Git-Tag: v2.6.32.21~38
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=592de9cc7e8c4886d05139771e748da2e9f13f4b;p=karo-tx-linux.git

drm/i915/edp: Flush the write before waiting for PLLs

commit 5ddb954b9ee50824977d2931e0ff58b3050b337d upstream.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 88d5e3ad48ad..4f5c733ca974 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1402,6 +1402,7 @@ static void igdng_enable_pll_edp (struct drm_crtc *crtc)
 	dpa_ctl = I915_READ(DP_A);
 	dpa_ctl |= DP_PLL_ENABLE;
 	I915_WRITE(DP_A, dpa_ctl);
+	POSTING_READ(DP_A);
 	udelay(200);
 }