[PATCH 06/23] drm/amd/display: Support DP tunneling when DPRX detection
Wayne Lin
Wayne.Lin at amd.com
Mon Oct 4 14:40:33 UTC 2021
From: Jimmy Kizito <Jimmy.Kizito at amd.com>
[why & how]
Add codes for commit "99732e52e7f8 drm/amd/display: Update DPRX detection"
to support USB4 DP tunneling feature
Reviewed-by: Jun Lei <Jun.Lei at amd.com>
Acked-by: Wayne Lin <Wayne.Lin at amd.com>
Acked-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Signed-off-by: Jimmy Kizito <Jimmy.Kizito at amd.com>
---
drivers/gpu/drm/amd/display/dc/Makefile | 2 +-
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 2 +
.../gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++
.../drm/amd/display/dc/core/dc_link_dpia.c | 34 +++++++++++++++++
.../gpu/drm/amd/display/dc/inc/dc_link_dpia.h | 38 +++++++++++++++++++
5 files changed, 79 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
create mode 100644 drivers/gpu/drm/amd/display/dc/inc/dc_link_dpia.h
diff --git a/drivers/gpu/drm/amd/display/dc/Makefile b/drivers/gpu/drm/amd/display/dc/Makefile
index 520f58538364..1a0e462bed42 100644
--- a/drivers/gpu/drm/amd/display/dc/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/Makefile
@@ -61,7 +61,7 @@ include $(AMD_DC)
DISPLAY_CORE = dc.o dc_stat.o dc_link.o dc_resource.o dc_hw_sequencer.o dc_sink.o \
dc_surface.o dc_link_hwss.o dc_link_dp.o dc_link_ddc.o dc_debug.o dc_stream.o \
-dc_link_enc_cfg.o dc_link_dpcd.o
+dc_link_enc_cfg.o dc_link_dpia.o dc_link_dpcd.o
ifdef CONFIG_DRM_AMD_DC_DCN
DISPLAY_CORE += dc_vm_helper.o
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 66182b8c217b..1c397d5551ba 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1726,6 +1726,7 @@ static bool dc_link_construct_dpia(struct dc_link *link,
/* Dummy Init for linkid */
link->link_id.type = OBJECT_TYPE_CONNECTOR;
link->link_id.id = CONNECTOR_ID_DISPLAY_PORT;
+ link->link_id.enum_id = ENUM_ID_1 + init_params->connector_index;
link->is_internal_display = false;
link->connector_signal = SIGNAL_TYPE_DISPLAY_PORT;
LINK_INFO("Connector[%d] description:signal %d\n",
@@ -1733,6 +1734,7 @@ static bool dc_link_construct_dpia(struct dc_link *link,
link->connector_signal);
link->ep_type = DISPLAY_ENDPOINT_USB4_DPIA;
+ link->is_dig_mapping_flexible = true;
/* TODO: Initialize link : funcs->link_init */
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 4df71d728319..9bc5f49ea2ec 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -36,6 +36,7 @@
#include "dpcd_defs.h"
#include "dc_dmub_srv.h"
#include "dce/dmub_hw_lock_mgr.h"
+#include "inc/dc_link_dpia.h"
#include "inc/link_enc_cfg.h"
/*Travis*/
@@ -4582,6 +4583,7 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
/* Attempt to train in LTTPR transparent mode if repeater count exceeds 8. */
is_lttpr_present = (dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) != 0 &&
+ link->dpcd_caps.lttpr_caps.phy_repeater_cnt < 0xff &&
link->dpcd_caps.lttpr_caps.max_lane_count > 0 &&
link->dpcd_caps.lttpr_caps.max_lane_count <= 4 &&
link->dpcd_caps.lttpr_caps.revision.raw >= 0x14);
@@ -4630,6 +4632,8 @@ static bool retrieve_link_cap(struct dc_link *link)
LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD);
is_lttpr_present = dp_retrieve_lttpr_cap(link);
+ /* Read DP tunneling information. */
+ status = dpcd_get_tunneling_device_data(link);
status = core_link_read_dpcd(link, DP_SET_POWER,
&dpcd_power_state, sizeof(dpcd_power_state));
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
new file mode 100644
index 000000000000..183601e300fe
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dpia.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2021 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
+ *
+ */
+
+#include "dc_link_dpia.h"
+#include "inc/core_status.h"
+#include "dc_link.h"
+
+enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link)
+{
+ /** @todo Read corresponding DPCD region and update link caps. */
+ return DC_OK;
+}
diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dpia.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dpia.h
new file mode 100644
index 000000000000..8ed0c9f6414b
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dpia.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2021 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
+ *
+ */
+
+#ifndef __DC_LINK_DPIA_H__
+#define __DC_LINK_DPIA_H__
+
+/* This module implements functionality for training DPIA links. */
+
+struct dc_link;
+
+/* Read tunneling device capability from DPCD and update link capability
+ * accordingly.
+ */
+enum dc_status dpcd_get_tunneling_device_data(struct dc_link *link);
+
+#endif /* __DC_LINK_DPIA_H__ */
--
2.25.1
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