[PATCH v4 2/2] drm/i915/display: split part of intel_display_reset_finish() to a new function

[Luca Coelho <luciano.coelho@intel.com>]

In the intel_display_reset_finish() function, we are currently calling
the non-display function intel_clock_gating_init(), creating an
unnecessary dependency.

In order to avoid this, split out the function calls that happen
before the call to intel_clock_gating_init() to a new function that
can be directly called by intel_gt_reset_global(), which then calls
intel_clock_gating_init() itself, if needed.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 .../drm/i915/display/intel_display_reset.c    | 19 +++++++++++++------
 .../drm/i915/display/intel_display_reset.h    |  1 +
 drivers/gpu/drm/i915/gt/intel_reset.c         |  5 +++++
 3 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.c b/drivers/gpu/drm/i915/display/intel_display_reset.c
index 504ec7043cd9..529dd1c1fa5d 100644
--- a/drivers/gpu/drm/i915/display/intel_display_reset.c
+++ b/drivers/gpu/drm/i915/display/intel_display_reset.c
@@ -8,7 +8,6 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_print.h>
 
-#include "intel_clock_gating.h"
 #include "intel_cx0_phy.h"
 #include "intel_display_core.h"
 #include "intel_display_driver.h"
@@ -73,6 +72,17 @@ void intel_display_reset_prepare(struct intel_display *display)
 	state->acquire_ctx = ctx;
 }
 
+bool intel_display_reset_reinit(struct intel_display *display)
+{
+	if (!display->restore.modeset_state)
+		return false;
+
+	intel_pps_unlock_regs_wa(display);
+	intel_display_driver_init_hw(display);
+
+	return true;
+}
+
 void intel_display_reset_finish(struct intel_display *display, bool test_only)
 {
 	struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
@@ -94,12 +104,9 @@ void intel_display_reset_finish(struct intel_display *display, bool test_only)
 		}
 	} else {
 		/*
-		 * The display has been reset as well,
-		 * so need a full re-initialization.
+		 * The display has been reset as well, so complete the
+		 * re-initialization started by intel_display_reset_reinit().
 		 */
-		intel_pps_unlock_regs_wa(display);
-		intel_display_driver_init_hw(display);
-		intel_clock_gating_init(display->drm);
 		intel_cx0_pll_power_save_wa(display);
 		intel_hpd_init(display);
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.h b/drivers/gpu/drm/i915/display/intel_display_reset.h
index b88c330a3441..e741e969d877 100644
--- a/drivers/gpu/drm/i915/display/intel_display_reset.h
+++ b/drivers/gpu/drm/i915/display/intel_display_reset.h
@@ -13,6 +13,7 @@ struct intel_display;
 bool intel_display_reset_supported(struct intel_display *display);
 bool intel_display_reset_test(struct intel_display *display);
 void intel_display_reset_prepare(struct intel_display *display);
+bool intel_display_reset_reinit(struct intel_display *display);
 void intel_display_reset_finish(struct intel_display *display, bool test_only);
 
 void intel_display_reset_debugfs_register(struct intel_display *display);
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 6053f3e8aa27..be282cfbe615 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -24,6 +24,7 @@
 #include "i915_reg.h"
 #include "i915_wait_util.h"
 #include "intel_breadcrumbs.h"
+#include "intel_clock_gating.h"
 #include "intel_engine_pm.h"
 #include "intel_engine_regs.h"
 #include "intel_gt.h"
@@ -1445,6 +1446,10 @@ static void intel_gt_reset_global(struct intel_gt *gt,
 
 		intel_gt_reset(gt, engine_mask, reason);
 
+		if (need_display_reset &&
+		    intel_display_reset_reinit(display))
+			intel_clock_gating_init(&i915->drm);
+
 		if (reset_display)
 			intel_display_reset_finish(display, !need_display_reset);
 	}
-- 
2.53.0