drm/i915/gsc: Only initialize GSC in tile 0

For multi-tile setups the GSC operational only on the tile 0.
Skip GSC auxiliary device creation for all other tiles
in GSC device init code.
Initialize basic GSC fields and use the same path
as HECI1 (HECI_PXP) device disable.

Cc: Tomas Winkler <tomas.winkler@intel.com>
Cc: Vitaly Lubart <vitaly.lubart@intel.com>
Signed-off-by: NJosé Roberto de Souza <jose.souza@intel.com>
Signed-off-by: NAlexander Usyskin <alexander.usyskin@intel.com>
Acked-by: NTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: NTomas Winkler <tomas.winkler@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221121092449.328674-1-alexander.usyskin@intel.com

drivers/gpu/drm/i915/gt/intel_gsc.c

@@ -174,6 +174,14 @@ static void gsc_init_one(struct drm_i915_private *i915, struct intel_gsc *gsc,
 	intf->irq = -1;
 	intf->id = intf_id;
 
+	/*
+	 * On the multi-tile setups the GSC is functional on the first tile only
+	 */
+	if (gsc_to_gt(gsc)->info.id != 0) {
+		drm_dbg(&i915->drm, "Not initializing gsc for remote tiles\n");
+		return;
+	}
+
 	if (intf_id == 0 && !HAS_HECI_PXP(i915))
 		return;