1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
new file mode 100644
index 000000000000..5e531620926f
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_phy.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+/* FILE POLICY AND INTENDED USAGE:
+ * This file implements basic dp phy functionality such as enable/disable phy
+ * output and set lane/drive settings. This file is responsible for maintaining
+ * and update software state representing current phy status such as current
+ * link settings.
+ */
+
+#include "link_dp_phy.h"
+#include "link_dpcd.h"
+#include "link_dp_training.h"
+#include "link_dp_capability.h"
+#include "clk_mgr.h"
+#include "resource.h"
+
+#define DC_LOGGER \
+	link->ctx->logger
+
+void dc_link_dp_receiver_power_ctrl(struct dc_link *link, bool on)
+{
+	uint8_t state;
+
+	state = on ? DP_POWER_STATE_D0 : DP_POWER_STATE_D3;
+
+	if (link->sync_lt_in_progress)
+		return;
+
+	core_link_write_dpcd(link, DP_SET_POWER, &state,
+						 sizeof(state));
+
+}
+
+void dp_enable_link_phy(
+	struct dc_link *link,
+	const struct link_resource *link_res,
+	enum signal_type signal,
+	enum clock_source_id clock_source,
+	const struct dc_link_settings *link_settings)
+{
+	link->cur_link_settings = *link_settings;
+	link->dc->hwss.enable_dp_link_output(link, link_res, signal,
+			clock_source, link_settings);
+	dc_link_dp_receiver_power_ctrl(link, true);
+}
+
+void dp_disable_link_phy(struct dc_link *link,
+		const struct link_resource *link_res,
+		enum signal_type signal)
+{
+	struct dc  *dc = link->ctx->dc;
+
+	if (!link->wa_flags.dp_keep_receiver_powered)
+		dc_link_dp_receiver_power_ctrl(link, false);
+
+	dc->hwss.disable_link_output(link, link_res, signal);
+	/* Clear current link setting.*/
+	memset(&link->cur_link_settings, 0,
+			sizeof(link->cur_link_settings));
+
+	if (dc->clk_mgr->funcs->notify_link_rate_change)
+		dc->clk_mgr->funcs->notify_link_rate_change(dc->clk_mgr, link);
+}
+
+void dp_disable_link_phy_mst(struct dc_link *link,
+		const struct link_resource *link_res,
+		enum signal_type signal)
+{
+	/* MST disable link only when no stream use the link */
+	if (link->mst_stream_alloc_table.stream_count > 0)
+		return;
+
+	dp_disable_link_phy(link, link_res, signal);
+
+	/* set the sink to SST mode after disabling the link */
+	dp_enable_mst_on_sink(link, false);
+}
+
+static inline bool is_immediate_downstream(struct dc_link *link, uint32_t offset)
+{
+	return (dp_parse_lttpr_repeater_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) ==
+			offset);
+}
+
+void dp_set_hw_lane_settings(
+	struct dc_link *link,
+	const struct link_resource *link_res,
+	const struct link_training_settings *link_settings,
+	uint32_t offset)
+{
+	const struct link_hwss *link_hwss = get_link_hwss(link, link_res);
+
+	if ((link_settings->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) &&
+			!is_immediate_downstream(link, offset))
+		return;
+
+	if (link_hwss->ext.set_dp_lane_settings)
+		link_hwss->ext.set_dp_lane_settings(link, link_res,
+				&link_settings->link_settings,
+				link_settings->hw_lane_settings);
+
+	memmove(link->cur_lane_setting,
+			link_settings->hw_lane_settings,
+			sizeof(link->cur_lane_setting));
+}
+
+void dp_set_drive_settings(
+	struct dc_link *link,
+	const struct link_resource *link_res,
+	struct link_training_settings *lt_settings)
+{
+	/* program ASIC PHY settings*/
+	dp_set_hw_lane_settings(link, link_res, lt_settings, DPRX);
+
+	dp_hw_to_dpcd_lane_settings(lt_settings,
+			lt_settings->hw_lane_settings,
+			lt_settings->dpcd_lane_settings);
+
+	/* Notify DP sink the PHY settings from source */
+	dpcd_set_lane_settings(link, lt_settings, DPRX);
+}