[PATCH 05/10] drm/amd/display: Add hook for MST root branch info

[sunpeng.li]

From: Nikola Cornij <nikola.cor...@amd.com>

This allows DM to do any necessary updates before MST discovery starts.

Change-Id: I106b56b0ffe1c0e00a27c81fcee3776c69e17575
Signed-off-by: Nikola Cornij <nikola.cor...@amd.com>
Reviewed-by: Nikola Cornij <nikola.cor...@amd.com>
Acked-by: Leo Li <sunpeng...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 5 +++++
 drivers/gpu/drm/amd/display/dc/core/dc_link.c             | 4 ++++
 drivers/gpu/drm/amd/display/dc/dm_helpers.h               | 8 ++++++++
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 59b113d..8403b6a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -169,6 +169,11 @@ static void get_payload_table(
        mutex_unlock(&mst_mgr->payload_lock);
 }
 
+void dm_helpers_dp_update_branch_info(
+       struct dc_context *ctx,
+       const struct dc_link *link)
+{}
+
 /*
  * Writes payload allocation table in immediate downstream device.
  */
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 bbe43fd..4de68fa 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -529,6 +529,10 @@ static bool detect_dp(
                        if (reason == DETECT_REASON_BOOT)
                                boot = true;
 
+                       dm_helpers_dp_update_branch_info(
+                               link->ctx,
+                               link);
+
                        if (!dm_helpers_dp_mst_start_top_mgr(
                                link->ctx,
                                link, boot)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dm_helpers.h 
b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
index 7e6b9f5..5d4527d 100644
--- a/drivers/gpu/drm/amd/display/dc/dm_helpers.h
+++ b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
@@ -40,6 +40,14 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
        const struct dc_edid *edid,
        struct dc_edid_caps *edid_caps);
 
+
+/*
+ * Update DP branch info
+ */
+void dm_helpers_dp_update_branch_info(
+               struct dc_context *ctx,
+               const struct dc_link *link);
+
 /*
  * Writes payload allocation table in immediate downstream device.
  */
-- 
2.7.4

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