[RFC PATCH] drm/i915: Don't touch PORT_HOTPLUG_EN in intel_dp_detect()

[Karsten Wiese <fzuuzf@googlemail.com>]

PORT_HOTPLUG_EN has allready been setup in i915_driver_irq_postinstall(),
when intel_dp_detect() runs.

Delete the DP[BCD]_HOTPLUG_INT_EN defines, they are not referenced anymore.

I found this while searching for a fix for
        https://bugzilla.redhat.com/show_bug.cgi?id=528312

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
---
See also 
"drm/i915: only enable hotplug for detected outputs"
b01f2c3a4a37d09a47ad73ccbb46d554d21cfeb0

 drivers/gpu/drm/i915/i915_reg.h |    3 ---
 drivers/gpu/drm/i915/intel_dp.c |   10 ----------
 2 files changed, 0 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ab1bd2d..92f440d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -854,11 +854,8 @@
 /* Hotplug control (945+ only) */
 #define PORT_HOTPLUG_EN                0x61110
 #define   HDMIB_HOTPLUG_INT_EN                 (1 << 29)
-#define   DPB_HOTPLUG_INT_EN                   (1 << 29)
 #define   HDMIC_HOTPLUG_INT_EN                 (1 << 28)
-#define   DPC_HOTPLUG_INT_EN                   (1 << 28)
 #define   HDMID_HOTPLUG_INT_EN                 (1 << 27)
-#define   DPD_HOTPLUG_INT_EN                   (1 << 27)
 #define   SDVOB_HOTPLUG_INT_EN                 (1 << 26)
 #define   SDVOC_HOTPLUG_INT_EN                 (1 << 25)
 #define   TV_HOTPLUG_INT_EN                    (1 << 18)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 439506c..7a3b5c8 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1179,16 +1179,6 @@ intel_dp_detect(struct drm_connector *connector)
        if (IS_IRONLAKE(dev))
                return ironlake_dp_detect(connector);

-       temp = I915_READ(PORT_HOTPLUG_EN);
-
-       I915_WRITE(PORT_HOTPLUG_EN,
-              temp |
-              DPB_HOTPLUG_INT_EN |
-              DPC_HOTPLUG_INT_EN |
-              DPD_HOTPLUG_INT_EN);
-
-       POSTING_READ(PORT_HOTPLUG_EN);
-
        switch (dp_priv->output_reg) {
        case DP_B:
                bit = DPB_HOTPLUG_INT_STATUS;
--