drm/xe: Use gsc_proxy_init_done to check proxy status

Expose gsc_proxy_init_done so that we can check if gsc proxy has
been initialized or not.

--v2
-Check if GSC FW is enabled before taking forcewake ref [Daniele]

--v3
-Directly call proxy check function inside if condition
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240306024247.1857881-5-suraj.kandpal@intel.com

drivers/gpu/drm/xe/display/xe_hdcp_gsc.c

@@ -4,8 +4,14 @@
  */
 
 #include <drm/drm_print.h>
+
 #include "intel_hdcp_gsc.h"
 #include "xe_device_types.h"
+#include "xe_device.h"
+#include "xe_gt.h"
+#include "xe_gsc_proxy.h"
+#include "xe_pm.h"
+#include "xe_uc_fw.h"
 
 bool intel_hdcp_gsc_cs_required(struct xe_device *xe)
 {
@@ -14,7 +20,28 @@ bool intel_hdcp_gsc_cs_required(struct xe_device *xe)
 
 bool intel_hdcp_gsc_check_status(struct xe_device *xe)
 {
-	return false;
+	struct xe_tile *tile = xe_device_get_root_tile(xe);
+	struct xe_gt *gt = tile->media_gt;
+	bool ret = true;
+
+	if (!xe_uc_fw_is_enabled(&gt->uc.gsc.fw))
+		return false;
+
+	xe_pm_runtime_get(xe);
+	if (xe_force_wake_get(gt_to_fw(gt), XE_FW_GSC)) {
+		drm_dbg_kms(&xe->drm,
+			    "failed to get forcewake to check proxy status\n");
+		ret = false;
+		goto out;
+	}
+
+	if (!xe_gsc_proxy_init_done(&gt->uc.gsc))
+		ret = false;
+
+	xe_force_wake_put(gt_to_fw(gt), XE_FW_GSC);
+out:
+	xe_pm_runtime_put(xe);
+	return ret;
 }
 
 int intel_hdcp_gsc_init(struct xe_device *xe)

drivers/gpu/drm/xe/xe_gsc_proxy.c

@@ -66,7 +66,7 @@ static inline struct xe_device *kdev_to_xe(struct device *kdev)
 	return dev_get_drvdata(kdev);
 }
 
-static bool gsc_proxy_init_done(struct xe_gsc *gsc)
+bool xe_gsc_proxy_init_done(struct xe_gsc *gsc)
 {
 	struct xe_gt *gt = gsc_to_gt(gsc);
 	u32 fwsts1 = xe_mmio_read32(gt, HECI_FWSTS1(MTL_GSC_HECI1_BASE));
@@ -528,7 +528,7 @@ int xe_gsc_proxy_start(struct xe_gsc *gsc)
 	if (err)
 		return err;
 
-	if (!gsc_proxy_init_done(gsc)) {
+	if (!xe_gsc_proxy_init_done(gsc)) {
 		xe_gt_err(gsc_to_gt(gsc), "GSC FW reports proxy init not completed\n");
 		return -EIO;
 	}

drivers/gpu/drm/xe/xe_gsc_proxy.h

@@ -11,6 +11,7 @@
 struct xe_gsc;
 
 int xe_gsc_proxy_init(struct xe_gsc *gsc);
+bool xe_gsc_proxy_init_done(struct xe_gsc *gsc);
 void xe_gsc_proxy_remove(struct xe_gsc *gsc);
 int xe_gsc_proxy_start(struct xe_gsc *gsc);