[FOR CI 4/4] drm/xe: Initialise display before GT and tile init

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Display needs to be initialised first, because we need to preserve the
initial framebuffer. It will be overwritten by any allocation we do,
especially on discrete where the framebuffer is not in stolen memory.

On integrated even if we still recover the initial framebuffer after
allocating, it still shows up as temporary corruption on-screen.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/xe/xe_device.c | 37 +++++++++++++++++++++-------------
 drivers/gpu/drm/xe/xe_gt.c     | 12 +++++++++++
 drivers/gpu/drm/xe/xe_gt.h     |  1 +
 3 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index 76d8c6868d15e..34bf62a1bcf27 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -683,21 +683,10 @@ int xe_device_probe(struct xe_device *xe)
 		err = xe_ggtt_init_early(tile->mem.ggtt);
 		if (err)
 			return err;
-		err = xe_memirq_init(&tile->memirq);
-		if (err)
-			return err;
 	}
 
-	for_each_gt(gt, xe, id) {
-		err = xe_gt_init_hwconfig(gt);
-		if (err)
-			return err;
-	}
 
 	err = xe_devcoredump_init(xe);
-	if (err)
-		return err;
-	err = devm_add_action_or_reset(xe->drm.dev, xe_driver_flr_fini, xe);
 	if (err)
 		return err;
 
@@ -705,9 +694,11 @@ int xe_device_probe(struct xe_device *xe)
 	if (err)
 		return err;
 
-	err = xe_irq_install(xe);
-	if (err)
-		goto err;
+	for_each_gt(gt, xe, id) {
+		err = xe_gt_init_mcr(gt);
+		if (err)
+			return err;
+	}
 
 	err = probe_has_flat_ccs(xe);
 	if (err)
@@ -736,12 +727,30 @@ int xe_device_probe(struct xe_device *xe)
 	if (err)
 		goto err;
 
+	/* Now we initialise the rest of GT and tiles, and enable interrupts. */
 	for_each_tile(tile, xe, id) {
+		err = xe_memirq_init(&tile->memirq);
+		if (err)
+			return err;
+
 		err = xe_tile_init(tile);
 		if (err)
 			goto err;
 	}
 
+	for_each_gt(gt, xe, id) {
+		err = xe_gt_init_hwconfig(gt);
+		if (err)
+			return err;
+	}
+	err = devm_add_action_or_reset(xe->drm.dev, xe_driver_flr_fini, xe);
+	if (err)
+		return err;
+
+	err = xe_irq_install(xe);
+	if (err)
+		goto err;
+
 	for_each_gt(gt, xe, id) {
 		last_gt = id;
 
diff --git a/drivers/gpu/drm/xe/xe_gt.c b/drivers/gpu/drm/xe/xe_gt.c
index 89e9d9d4db060..740786f34fbcb 100644
--- a/drivers/gpu/drm/xe/xe_gt.c
+++ b/drivers/gpu/drm/xe/xe_gt.c
@@ -542,6 +542,18 @@ static int all_fw_domain_init(struct xe_gt *gt)
 	return err;
 }
 
+int xe_gt_init_mcr(struct xe_gt *gt)
+{
+	/* Init enough GT for display init to go through */
+	unsigned int fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
+		return -ETIMEDOUT;
+
+	xe_gt_mcr_init_early(gt);
+	xe_pat_init(gt);
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
+	return 0;
+}
 /*
  * Initialize enough GT to be able to load GuC in order to obtain hwconfig and
  * enable CTB communication.
diff --git a/drivers/gpu/drm/xe/xe_gt.h b/drivers/gpu/drm/xe/xe_gt.h
index 82b9b7f82fcab..58aa95fe0aa61 100644
--- a/drivers/gpu/drm/xe/xe_gt.h
+++ b/drivers/gpu/drm/xe/xe_gt.h
@@ -29,6 +29,7 @@ static inline bool xe_fault_inject_gt_reset(void)
 
 struct xe_gt *xe_gt_alloc(struct xe_tile *tile);
 int xe_gt_init_hwconfig(struct xe_gt *gt);
+int xe_gt_init_mcr(struct xe_gt *gt);
 int xe_gt_init_early(struct xe_gt *gt);
 int xe_gt_init(struct xe_gt *gt);
 void xe_gt_mmio_init(struct xe_gt *gt);
-- 
2.45.2