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As explained in the previous patch, the MST link BW reported by branch devices during topology probing/path resources enumeration depends on the link parameters programmed to DPCD to be up-to-date. After a sink is plugged this is not ensured, as those DPCD values start out zeroed. The target link parameters (for a subsequent modeset) are the maximum that is supported, so make sure these maximum values are programmed before the topology probing. Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240722165503.2084999-14-imre.deak@intel.com
33 lines
1.2 KiB
C
33 lines
1.2 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2019 Intel Corporation
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*/
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#ifndef __INTEL_DP_MST_H__
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#define __INTEL_DP_MST_H__
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#include <linux/types.h>
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struct intel_atomic_state;
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struct intel_crtc;
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struct intel_crtc_state;
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struct intel_digital_port;
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struct intel_dp;
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struct intel_link_bw_limits;
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int intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_id);
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void intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port);
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int intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port);
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bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state);
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bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state);
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bool intel_dp_mst_source_support(struct intel_dp *intel_dp);
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int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
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struct intel_crtc *crtc);
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int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
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struct intel_link_bw_limits *limits);
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bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state,
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struct intel_crtc *crtc);
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void intel_dp_mst_prepare_probe(struct intel_dp *intel_dp);
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#endif /* __INTEL_DP_MST_H__ */
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