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 <[e-mail]>
Reviewed-by: Arun R Murthy <[e-mail]>
Reviewed-by: Daniele Ceraolo Spurio <[e-mail]>
Signed-off-by: Mika Kahola <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

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

···
  */
 
 #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)
 {
···
 
 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

···
 	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));
···
 	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

···
 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);