drm/i915: ivb: fix edp voltage swing reg val

commit 77fa4cbd5fa389e28419bbe8ac491b5fdd54840d upstream.

Fix the typo introduced in

commit 1a2eb4604b85c5efb343da8a4dcf41288fcfca85
Author: Keith Packard <keithp@keithp.com>
Date:   Wed Nov 16 16:26:07 2011 -0800

    drm/i915: Hook up Ivybridge eDP

This fixes eDP link-training failures and cases where all voltage swing
/pre-emphasis levels were tried and failed during clock recovery and -
as a fallback - we go on to do channel equalization with the last voltage
swing/pre-emphasis level which will succeed. Both issues can lead to a
blank screen.

v2:
- improve commit message

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64880
Tested-by: Jeremy Moles <cubicool@gmail.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 7d43a45..97a050f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3516,7 +3516,7 @@
 #define EDP_LINK_TRAIN_600MV_0DB_IVB           (0x30 <<22)
 #define EDP_LINK_TRAIN_600MV_3_5DB_IVB         (0x36 <<22)
 #define EDP_LINK_TRAIN_800MV_0DB_IVB           (0x38 <<22)
-#define EDP_LINK_TRAIN_800MV_3_5DB_IVB         (0x33 <<22)
+#define EDP_LINK_TRAIN_800MV_3_5DB_IVB         (0x3e <<22)
 
 /* legacy values */
 #define EDP_LINK_TRAIN_500MV_0DB_IVB           (0x00 <<22)