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: v2.6.35.4~67
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f2624fb7b37bf8d8b36bb01e2e86939ca049dbc;p=thirdparty%2Fkernel%2Fstable.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 0a552c884e4b5..e9a4b125d66e4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1502,6 +1502,7 @@ static void ironlake_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);
 }