[PATCH 15/16] Revert "drm/i915: cleanup: drm_modeset_lock_all_ctx() --> DRM_MODESET_LOCK_ALL_BEGIN()"

[Sean Paul]

From: Sean Paul <seanp...@chromium.org>

This reverts commit 399190e70816886e2bca1f3f3bc3d9c544af88e7.

This patchset breaks on intel platforms and was previously NACK'd by
Ville.

Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Fernando Ramos <green...@u92.eu>
Signed-off-by: Sean Paul <seanp...@chromium.org>
---
 drivers/gpu/drm/i915/display/intel_display.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index 2bf01416d656..134a6acbd8fb 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -43,7 +43,6 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_rect.h>
-#include <drm/drm_drv.h>
 
 #include "display/intel_audio.h"
 #include "display/intel_crt.h"
@@ -13477,13 +13476,22 @@ void intel_display_resume(struct drm_device *dev)
        if (state)
                state->acquire_ctx = &ctx;
 
-       DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
+       drm_modeset_acquire_init(&ctx, 0);
 
-       ret = __intel_display_resume(dev, state, &ctx);
+       while (1) {
+               ret = drm_modeset_lock_all_ctx(dev, &ctx);
+               if (ret != -EDEADLK)
+                       break;
 
-       intel_enable_ipc(dev_priv);
+               drm_modeset_backoff(&ctx);
+       }
+
+       if (!ret)
+               ret = __intel_display_resume(dev, state, &ctx);
 
-       DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
+       intel_enable_ipc(dev_priv);
+       drm_modeset_drop_locks(&ctx);
+       drm_modeset_acquire_fini(&ctx);
 
        if (ret)
                drm_err(&dev_priv->drm,
-- 
Sean Paul, Software Engineer, Google / Chromium OS