drm/i915: Drop vblank wait from intel_dp_link_down

commit 0ca09685546fed5fc8f0535204f0626f352140f4 upstream.

Nothing in Bspec seems to indicate that we actually needs this, and it
looks like can't work since by this point the pipe is off and so
vblanks won't really happen any more.

Note that Bspec mentions that it takes a vblank for this bit to
change, but _only_ when enabling.

Dropping this code quenches an annoying backtrace introduced by the
more anal checking since

commit 51e31d49c89055299e34b8f44d13f70e19aaaad1
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Mon Sep 15 12:36:02 2014 +0200

    drm/i915: Use generic vblank wait

Note: This fixes the fallout from the above commit, but does not address
the shortcomings of the IBX transcoder select workaround implementation
discussed during review [1].

[1] http://mid.gmane.org/87y4o7usxf.fsf@intel.com

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86095
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5cecc20efa71df1fc8171de1660fcd4d28b99e8b..9f6c8971855c4c3a07948dfbad4354289940e943 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3515,8 +3515,6 @@ intel_dp_link_down(struct intel_dp *intel_dp)
        enum port port = intel_dig_port->port;
        struct drm_device *dev = intel_dig_port->base.base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
-       struct intel_crtc *intel_crtc =
-               to_intel_crtc(intel_dig_port->base.base.crtc);
        uint32_t DP = intel_dp->DP;
 
        if (WARN_ON(HAS_DDI(dev)))
@@ -3541,8 +3539,6 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 
        if (HAS_PCH_IBX(dev) &&
            I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
-               struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
-
                /* Hardware workaround: leaving our transcoder select
                 * set to transcoder B while it's off will prevent the
                 * corresponding HDMI output on transcoder A.
@@ -3553,18 +3549,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
                 */
                DP &= ~DP_PIPEB_SELECT;
                I915_WRITE(intel_dp->output_reg, DP);
-
-               /* Changes to enable or select take place the vblank
-                * after being written.
-                */
-               if (WARN_ON(crtc == NULL)) {
-                       /* We should never try to disable a port without a crtc
-                        * attached. For paranoia keep the code around for a
-                        * bit. */
-                       POSTING_READ(intel_dp->output_reg);
-                       msleep(50);
-               } else
-                       intel_wait_for_vblank(dev, intel_crtc->pipe);
+               POSTING_READ(intel_dp->output_reg);
        }
 
        DP &= ~DP_AUDIO_OUTPUT_ENABLE;