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: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221121092449.328674-1-alexander.usyskin@intel.com

diff --git a/drivers/gpu/drm/i915/gt/intel_gsc.c b/drivers/gpu/drm/i915/gt/intel_gsc.c
index 976fdf27e79097ae1ac8dec4599b96bd0ac6db2c..bcc3605158dbde43fbac73bd5dd24c9a873549c0 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_gsc.c
+++ b/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;