FAILED: patch "[PATCH] drm/amd/display: Fix DFPstate hang due to view port changed" failed to apply to 5.9-stable tree

The patch below does not apply to the 5.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 9804ecbba8f73916101ac36929bc647c3cb17155 Mon Sep 17 00:00:00 2001
From: Paul Hsieh <[email protected]>
Date: Wed, 5 Aug 2020 17:28:37 +0800
Subject: [PATCH] drm/amd/display: Fix DFPstate hang due to view port changed

[Why]
Place the cursor in the center of screen between two pipes then adjusting the viewport but cursour doesn't update cause DFPstate hang.

[How]
If viewport changed, update cursor as well.

index 66180b4332f1..c8cfd3ba1c15 100644
@@ -1457,8 +1457,8 @@ static void dcn20_update_dchubp_dpp(
 
 	/* Any updates are handled in dc interface, just need to apply existing for plane enable */
 	if ((pipe_ctx->update_flags.bits.enable || pipe_ctx->update_flags.bits.opp_changed ||
-			pipe_ctx->update_flags.bits.scaler || pipe_ctx->update_flags.bits.viewport)
-			&& pipe_ctx->stream->cursor_attributes.address.quad_part != 0) {
+			pipe_ctx->update_flags.bits.scaler || viewport_changed == true) &&
+			pipe_ctx->stream->cursor_attributes.address.quad_part != 0) {
 		dc->hwss.set_cursor_position(pipe_ctx);
 		dc->hwss.set_cursor_attribute(pipe_ctx);