drm/i915/bxt: Disable power well support

BXT power well support is not yet stable.  Starting with patch

        commit ed151f99bcce70b1a6fe659c1e6c8baa1e0e0bd0
        Author: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
        Date:   Mon Nov 16 16:20:01 2015 +0100

            drm/i915/gen9: Turn DC handling into a power well

DPMS off operations may actually cause the entire system to powerdown or
reboot.  Disable power well support for now until Broxton gets fixes
similar to what we have for SKL.

Cc: Imre Deak <imre.deak@intel.com>
Cc: Patrik Jakobsson <patrik.jakobsson@linux.intel.com>
References: http://lists.freedesktop.org/archives/intel-gfx/2015-November/081037.html
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1448990818-11005-1-git-send-email-matthew.d.roper@intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 3fa43af9494659d4a5f5df1a1f48c1b6f1d90750..ab833efb5f0c7cc3c2692d738c8b9300340652cb 100644 (file)
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1911,6 +1911,11 @@ sanitize_disable_power_well_option(const struct drm_i915_private *dev_priv,
        if (disable_power_well >= 0)
                return !!disable_power_well;
 
+       if (IS_BROXTON(dev_priv)) {
+               DRM_DEBUG_KMS("Disabling display power well support\n");
+               return 0;
+       }
+
        return 1;
 }