[PATCH 2/2] drm/i915/hdcp: Modify intel_gsc_send_sync function

[Suraj Kandpal <suraj.kandpal@xxxxxxxxx>]

Modify intel_gsc_send_sync() to take into account header_out
and addr_out so as to use them to verify the message send status.

Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
Cc: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_hdcp_gsc.c | 29 +++++++++++--------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
index 72d1e261d0a9..5f29c3c559fa 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c
@@ -726,38 +726,42 @@ void intel_hdcp_gsc_fini(struct drm_i915_private *i915)
 }
 
 static int intel_gsc_send_sync(struct drm_i915_private *i915,
-			       struct intel_gsc_mtl_header *header, u64 addr,
+			       struct intel_gsc_mtl_header *header_in,
+			       struct intel_gsc_mtl_header *header_out,
+			       u64 addr_in, u64 addr_out,
 			       size_t msg_out_len)
 {
 	struct intel_gt *gt = i915->media_gt;
 	int ret;
 
-	header->flags = 0;
-	ret = intel_gsc_uc_heci_cmd_submit_packet(&gt->uc.gsc, addr,
-						  header->message_size,
-						  addr,
-						  msg_out_len + sizeof(*header));
+	ret = intel_gsc_uc_heci_cmd_submit_packet(&gt->uc.gsc, addr_in,
+						  header_in->message_size,
+						  addr_out,
+						  msg_out_len + sizeof(*header_out));
 	if (ret) {
 		drm_err(&i915->drm, "failed to send gsc HDCP msg (%d)\n", ret);
 		return ret;
 	}
 
 	/*
-	 * Checking validity marker for memory sanity
+	 * Checking validity marker and header status to see if some error has
+	 * blocked us from sending message to gsc cs
 	 */
-	if (header->validity_marker != GSC_HECI_VALIDITY_MARKER) {
+	if (header_out->validity_marker != GSC_HECI_VALIDITY_MARKER) {
 		drm_err(&i915->drm, "invalid validity marker\n");
 		return -EINVAL;
 	}
 
-	if (header->status != 0) {
+	if (header_out->status != 0) {
 		drm_err(&i915->drm, "header status indicates error %d\n",
-			header->status);
+			header_out->status);
 		return -EINVAL;
 	}
 
-	if (header->flags & GSC_OUTFLAG_MSG_PENDING)
+	if (header_out->flags & GSC_OUTFLAG_MSG_PENDING) {
+		header_in->gsc_message_handle = header_out->gsc_message_handle;
 		return -EAGAIN;
+	}
 
 	return 0;
 }
@@ -809,7 +813,8 @@ ssize_t intel_hdcp_gsc_msg_send(struct drm_i915_private *i915, u8 *msg_in,
 	 * 20 times each message 50 ms apart
 	 */
 	do {
-		ret = intel_gsc_send_sync(i915, header_in, addr_in, msg_out_len);
+		ret = intel_gsc_send_sync(i915, header_in, header_out, addr_in,
+					  addr_out, msg_out_len);
 
 		/* Only try again if gsc says so */
 		if (ret != -EAGAIN)
-- 
2.25.1