drm/i915: Fix deadlock witha the pipe A quirk during resume

Pass down the correct acquire context to the pipe A quirk load detect
hack during display resume. Avoids deadlocking the entire thing.

Cc: stable@vger.kernel.org
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170601143619.27840-2-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99a3bfa..6806591 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -120,7 +120,8 @@ static void intel_crtc_init_scalers(struct intel_crtc *crtc,
 static void skylake_pfit_enable(struct intel_crtc *crtc);
 static void ironlake_pfit_disable(struct intel_crtc *crtc, bool force);
 static void ironlake_pfit_enable(struct intel_crtc *crtc);
-static void intel_modeset_setup_hw_state(struct drm_device *dev);
+static void intel_modeset_setup_hw_state(struct drm_device *dev,
+                                        struct drm_modeset_acquire_ctx *ctx);
 static void intel_pre_disable_primary_noatomic(struct drm_crtc *crtc);
 
 struct intel_limit {
@@ -3461,7 +3462,7 @@ __intel_display_resume(struct drm_device *dev,
        struct drm_crtc *crtc;
        int i, ret;
 
-       intel_modeset_setup_hw_state(dev);
+       intel_modeset_setup_hw_state(dev, ctx);
        i915_redisable_vga(to_i915(dev));
 
        if (!state)
@@ -15109,7 +15110,7 @@ int intel_modeset_init(struct drm_device *dev)
        intel_setup_outputs(dev_priv);
 
        drm_modeset_lock_all(dev);
-       intel_modeset_setup_hw_state(dev);
+       intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
        drm_modeset_unlock_all(dev);
 
        for_each_intel_crtc(dev, crtc) {
@@ -15146,13 +15147,13 @@ int intel_modeset_init(struct drm_device *dev)
        return 0;
 }
 
-static void intel_enable_pipe_a(struct drm_device *dev)
+static void intel_enable_pipe_a(struct drm_device *dev,
+                               struct drm_modeset_acquire_ctx *ctx)
 {
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        struct drm_connector *crt = NULL;
        struct intel_load_detect_pipe load_detect_temp;
-       struct drm_modeset_acquire_ctx *ctx = dev->mode_config.acquire_ctx;
        int ret;
 
        /* We can't just switch on the pipe A, we need to set things up with a
@@ -15224,7 +15225,8 @@ static bool has_pch_trancoder(struct drm_i915_private *dev_priv,
                (HAS_PCH_LPT_H(dev_priv) && pch_transcoder == TRANSCODER_A);
 }
 
-static void intel_sanitize_crtc(struct intel_crtc *crtc)
+static void intel_sanitize_crtc(struct intel_crtc *crtc,
+                               struct drm_modeset_acquire_ctx *ctx)
 {
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = to_i915(dev);
@@ -15280,7 +15282,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc)
                 * resume. Force-enable the pipe to fix this, the update_dpms
                 * call below we restore the pipe to the right state, but leave
                 * the required bits on. */
-               intel_enable_pipe_a(dev);
+               intel_enable_pipe_a(dev, ctx);
        }
 
        /* Adjust the state of the output pipe according to whether we
@@ -15583,7 +15585,8 @@ get_encoder_power_domains(struct drm_i915_private *dev_priv)
  * and sanitizes it to the current state
  */
 static void
-intel_modeset_setup_hw_state(struct drm_device *dev)
+intel_modeset_setup_hw_state(struct drm_device *dev,
+                            struct drm_modeset_acquire_ctx *ctx)
 {
        struct drm_i915_private *dev_priv = to_i915(dev);
        enum pipe pipe;
@@ -15603,7 +15606,7 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
        for_each_pipe(dev_priv, pipe) {
                crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
 
-               intel_sanitize_crtc(crtc);
+               intel_sanitize_crtc(crtc, ctx);
                intel_dump_pipe_config(crtc, crtc->config,
                                       "[setup_hw_state]");
        }