From: Nicholas Kazlauskas Date: Thu, 20 Nov 2025 14:51:34 +0000 (-0500) Subject: drm/amd/display: Reset pipe mask at beginning of cursor offload X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e7f7b3a20a8531463592086579f1db31b4a3483;p=thirdparty%2Fkernel%2Flinux.git drm/amd/display: Reset pipe mask at beginning of cursor offload [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 Signed-off-by: Nicholas Kazlauskas Signed-off-by: Roman Li Tested-by: Dan Wheeler Signed-off-by: Alex Deucher --- 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;