drm/i915: Unlock panel even when LVDS is disabled

Otherwise we'll have backtraces in assert_panel_unlocked because the
BIOS locks the register. In the reporter's case this regression was
introduced in

commit c31407a3672aaebb4acddf90944a114fa5c8af7b
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Oct 18 21:07:01 2012 +0100

    drm/i915: Add no-lvds quirk for Supermicro X7SPA-H

Reported-by: Alexey Orishko <alexey.orishko@gmail.com>
Cc: Alexey Orishko <alexey.orishko@gmail.com>
Cc: stable@vger.kernel.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Francois Tigeot <ftigeot@wolfpond.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Tested-by: Alexey Orishko <alexey.orishko@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index a6bd142..c0bbf21 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -899,6 +899,17 @@ void intel_lvds_init(struct drm_device *dev)
        int pipe;
        u8 pin;
 
+       /*
+        * Unlock registers and just leave them unlocked. Do this before
+        * checking quirk lists to avoid bogus WARNINGs.
+        */
+       if (HAS_PCH_SPLIT(dev)) {
+               I915_WRITE(PCH_PP_CONTROL,
+                          I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
+       } else {
+               I915_WRITE(PP_CONTROL,
+                          I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
+       }
        if (!intel_lvds_supported(dev))
                return;
 
@@ -1097,17 +1108,6 @@ out:
        lvds_encoder->a3_power = I915_READ(lvds_encoder->reg) &
                                 LVDS_A3_POWER_MASK;
 
-       /*
-        * Unlock registers and just
-        * leave them unlocked
-        */
-       if (HAS_PCH_SPLIT(dev)) {
-               I915_WRITE(PCH_PP_CONTROL,
-                          I915_READ(PCH_PP_CONTROL) | PANEL_UNLOCK_REGS);
-       } else {
-               I915_WRITE(PP_CONTROL,
-                          I915_READ(PP_CONTROL) | PANEL_UNLOCK_REGS);
-       }
        lvds_connector->lid_notifier.notifier_call = intel_lid_notify;
        if (acpi_lid_notifier_register(&lvds_connector->lid_notifier)) {
                DRM_DEBUG_KMS("lid notifier registration failed\n");