drm/i915/display: add intel_display_reset.[ch]

Split out the display reset functionality to a separate file to
declutter intel_display.c. Rename the functions accordingly. The minor
downside is having to expose __intel_display_resume().

Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5e98e2fc5f0c09490e02d22250c8201342852288.1681465222.git.jani.nikula@intel.com

1 files changed, 1 insertions, 122 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 8abce9a9a900..47ec1bf46f71 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -693,7 +693,7 @@ intel_plane_fence_y_offset(const struct intel_plane_state *plane_state)
 	return y;
 }
 
-static int
+int
 __intel_display_resume(struct drm_i915_private *i915,
 		       struct drm_atomic_state *state,
 		       struct drm_modeset_acquire_ctx *ctx)
@@ -733,127 +733,6 @@ __intel_display_resume(struct drm_i915_private *i915,
 	return ret;
 }
 
-static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
-{
-	return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
-		intel_has_gpu_reset(to_gt(dev_priv)));
-}
-
-void intel_display_prepare_reset(struct drm_i915_private *dev_priv)
-{
-	struct drm_modeset_acquire_ctx *ctx = &dev_priv->display.restore.reset_ctx;
-	struct drm_atomic_state *state;
-	int ret;
-
-	if (!HAS_DISPLAY(dev_priv))
-		return;
-
-	/* reset doesn't touch the display */
-	if (!dev_priv->params.force_reset_modeset_test &&
-	    !gpu_reset_clobbers_display(dev_priv))
-		return;
-
-	/* We have a modeset vs reset deadlock, defensively unbreak it. */
-	set_bit(I915_RESET_MODESET, &to_gt(dev_priv)->reset.flags);
-	smp_mb__after_atomic();
-	wake_up_bit(&to_gt(dev_priv)->reset.flags, I915_RESET_MODESET);
-
-	if (atomic_read(&dev_priv->gpu_error.pending_fb_pin)) {
-		drm_dbg_kms(&dev_priv->drm,
-			    "Modeset potentially stuck, unbreaking through wedging\n");
-		intel_gt_set_wedged(to_gt(dev_priv));
-	}
-
-	/*
-	 * Need mode_config.mutex so that we don't
-	 * trample ongoing ->detect() and whatnot.
-	 */
-	mutex_lock(&dev_priv->drm.mode_config.mutex);
-	drm_modeset_acquire_init(ctx, 0);
-	while (1) {
-		ret = drm_modeset_lock_all_ctx(&dev_priv->drm, ctx);
-		if (ret != -EDEADLK)
-			break;
-
-		drm_modeset_backoff(ctx);
-	}
-	/*
-	 * Disabling the crtcs gracefully seems nicer. Also the
-	 * g33 docs say we should at least disable all the planes.
-	 */
-	state = drm_atomic_helper_duplicate_state(&dev_priv->drm, ctx);
-	if (IS_ERR(state)) {
-		ret = PTR_ERR(state);
-		drm_err(&dev_priv->drm, "Duplicating state failed with %i\n",
-			ret);
-		return;
-	}
-
-	ret = drm_atomic_helper_disable_all(&dev_priv->drm, ctx);
-	if (ret) {
-		drm_err(&dev_priv->drm, "Suspending crtc's failed with %i\n",
-			ret);
-		drm_atomic_state_put(state);
-		return;
-	}
-
-	dev_priv->display.restore.modeset_state = state;
-	state->acquire_ctx = ctx;
-}
-
-void intel_display_finish_reset(struct drm_i915_private *i915)
-{
-	struct drm_modeset_acquire_ctx *ctx = &i915->display.restore.reset_ctx;
-	struct drm_atomic_state *state;
-	int ret;
-
-	if (!HAS_DISPLAY(i915))
-		return;
-
-	/* reset doesn't touch the display */
-	if (!test_bit(I915_RESET_MODESET, &to_gt(i915)->reset.flags))
-		return;
-
-	state = fetch_and_zero(&i915->display.restore.modeset_state);
-	if (!state)
-		goto unlock;
-
-	/* reset doesn't touch the display */
-	if (!gpu_reset_clobbers_display(i915)) {
-		/* for testing only restore the display */
-		ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
-		if (ret) {
-			drm_WARN_ON(&i915->drm, ret == -EDEADLK);
-			drm_err(&i915->drm,
-				"Restoring old state failed with %i\n", ret);
-		}
-	} else {
-		/*
-		 * The display has been reset as well,
-		 * so need a full re-initialization.
-		 */
-		intel_pps_unlock_regs_wa(i915);
-		intel_display_driver_init_hw(i915);
-		intel_clock_gating_init(i915);
-		intel_hpd_init(i915);
-
-		ret = __intel_display_resume(i915, state, ctx);
-		if (ret)
-			drm_err(&i915->drm,
-				"Restoring old state failed with %i\n", ret);
-
-		intel_hpd_poll_disable(i915);
-	}
-
-	drm_atomic_state_put(state);
-unlock:
-	drm_modeset_drop_locks(ctx);
-	drm_modeset_acquire_fini(ctx);
-	mutex_unlock(&i915->drm.mode_config.mutex);
-
-	clear_bit_unlock(I915_RESET_MODESET, &to_gt(i915)->reset.flags);
-}
-
 static void icl_set_pipe_chicken(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);