From 369de54eecd1127cb512975cc91b95c0fecd2cad Mon Sep 17 00:00:00 2001
From: Sean Paul <seanpaul@chromium.org>
Date: Sat, 2 Oct 2021 11:45:41 -0400
Subject: [PATCH] Revert "drm/i915: cleanup: drm_modeset_lock_all_ctx() -->
 DRM_MODESET_LOCK_ALL_BEGIN()"
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This reverts commit 399190e70816886e2bca1f3f3bc3d9c544af88e7.

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

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Fernando Ramos <greenfoo@u92.eu>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211002154542.15800-15-sean@poorly.run
---
 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 2bf01416d656f..134a6acbd8fbe 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,
-- 
2.30.2