[PATCH 12/14] drm/amd/display: Reset pipe mask at beginning of cursor offload

[<Roman.Li@amd.com>]

From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>

[Why]
Double cursor when switching between hardware and software cursor when
dragging an MPO window can occur with cursor offload enabled.

The abort cursor update in the full programming path is responsible for
this issue since it does not reset the pipe mask when attempting to
submit an empty update.

The firmware programs the payload as requested which may contain
invalid or stale data for the previously enabled pipes, resulting in
an offset or double cursor.

[How]
For performance we don't want to memset the entire payload structure
due to its size, so just reset the pipe mask which will indicate the
payload data is empty.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
---
 drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
index cb2dfd34b5e2..1271bf55dac3 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
@@ -1631,6 +1631,7 @@ void dcn35_begin_cursor_offload_update(struct dc *dc, const struct pipe_ctx *pip
 	payload_idx = write_idx % ARRAY_SIZE(cs->offload_streams[stream_idx].payloads);
 
 	cs->offload_streams[stream_idx].payloads[payload_idx].write_idx_start = write_idx;
+	cs->offload_streams[stream_idx].payloads[payload_idx].pipe_mask = 0;
 
 	if (pipe->plane_res.hubp)
 		pipe->plane_res.hubp->cursor_offload = true;
-- 
2.34.1