From d6c6a76f80a1c91dceacef3630a7465ece630615 Mon Sep 17 00:00:00 2001 From: Bhawanpreet Lakha Date: Mon, 25 Oct 2021 18:38:22 -0400 Subject: drm: Update MST First Link Slot Information Based on Encoding Format 8b/10b encoding format requires to reserve the first slot for recording metadata. Real data transmission starts from the second slot, with a total of available 63 slots available. In 128b/132b encoding format, metadata is transmitted separately in LLCP packet before MTP. Real data transmission starts from the first slot, with a total of 64 slots available. v2: * Move total/start slots to mst_state, and copy it to mst_mgr in atomic_check v3: * Only keep the slot info on the mst_state * add a start_slot parameter to the payload function, to facilitate non atomic drivers (this is a temporary workaround and should be removed when we are moving out the non atomic driver helpers) v4: *fixed typo and formatting v5: (no functional changes) * Fixed formatting in drm_dp_mst_update_slots() * Reference mst_state instead of mst_state->mgr for debugging info Signed-off-by: Bhawanpreet Lakha Signed-off-by: Fangzhi Zuo [v5 nitpicks] Reviewed-by: Lyude Paul Signed-off-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/20211025223825.301703-3-lyude@redhat.com --- drivers/gpu/drm/nouveau/dispnv50/disp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/nouveau') diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index d7b9f7f8c9e3..8e28403ea9b1 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1414,7 +1414,7 @@ nv50_mstm_prepare(struct nv50_mstm *mstm) int ret; NV_ATOMIC(drm, "%s: mstm prepare\n", mstm->outp->base.base.name); - ret = drm_dp_update_payload_part1(&mstm->mgr); + ret = drm_dp_update_payload_part1(&mstm->mgr, 1); drm_for_each_encoder(encoder, mstm->outp->base.base.dev) { if (encoder->encoder_type == DRM_MODE_ENCODER_DPMST) { -- cgit