[PATCH 02/19] drm/amd/display: Add DSC Support for Synaptics Cascaded MST Hub

[Qingqing Zhuo]

From: Fangzhi Zuo <jerry....@amd.com>

Traditional synaptics hub has one MST branch device without virtual dpcd.
Synaptics cascaded hub has two chained MST branch devices. DSC decoding
is performed via root MST branch device, instead of the second MST branch
device.

Reviewed-by: Hersen Wu <hersenxs...@amd.com>
Acked-by: Qingqing Zhuo <qingqing.z...@amd.com>
Signed-off-by: Fangzhi Zuo <jerry....@amd.com>
---
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 19 +++++++++++++++++++
 .../display/amdgpu_dm/amdgpu_dm_mst_types.h   | 12 ++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 4b9b5e4050fc..9241d48e9d98 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -208,6 +208,21 @@ bool needs_dsc_aux_workaround(struct dc_link *link)
        return false;
 }
 
+bool is_synaptics_cascaded_panamera(struct dc_link *link, struct 
drm_dp_mst_port *port)
+{
+       u8 branch_vendor_data[4] = { 0 }; // Vendor data 0x50C ~ 0x50F
+
+       if (drm_dp_dpcd_read(port->mgr->aux, DP_BRANCH_VENDOR_SPECIFIC_START, 
&branch_vendor_data, 4) == 4) {
+               if (link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 
&&
+                               
IS_SYNAPTICS_CASCADED_PANAMERA(link->dpcd_caps.branch_dev_name, 
branch_vendor_data)) {
+                       DRM_INFO("Synaptics Cascaded MST hub\n");
+                       return true;
+               }
+       }
+
+       return false;
+}
+
 static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector 
*aconnector)
 {
        struct dc_sink *dc_sink = aconnector->dc_sink;
@@ -231,6 +246,10 @@ static bool validate_dsc_caps_on_connector(struct 
amdgpu_dm_connector *aconnecto
            needs_dsc_aux_workaround(aconnector->dc_link))
                aconnector->dsc_aux = &aconnector->mst_root->dm_dp_aux.aux;
 
+       /* synaptics cascaded MST hub case */
+       if (!aconnector->dsc_aux && 
is_synaptics_cascaded_panamera(aconnector->dc_link, port))
+               aconnector->dsc_aux = port->mgr->aux;
+
        if (!aconnector->dsc_aux)
                return false;
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
index 97fd70df531b..0b5750202e73 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
@@ -34,6 +34,18 @@
 #define SYNAPTICS_RC_OFFSET        0x4BC
 #define SYNAPTICS_RC_DATA          0x4C0
 
+#define DP_BRANCH_VENDOR_SPECIFIC_START 0x50C
+
+/**
+ * Panamera MST Hub detection
+ * Offset DPCD 050Eh == 0x5A indicates cascaded MST hub case
+ * Check from beginning of branch device vendor specific field (050Ch)
+ */
+#define IS_SYNAPTICS_PANAMERA(branchDevName) (((int)branchDevName[4] & 0xF0) 
== 0x50 ? 1 : 0)
+#define BRANCH_HW_REVISION_PANAMERA_A2 0x10
+#define SYNAPTICS_CASCADED_HUB_ID  0x5A
+#define IS_SYNAPTICS_CASCADED_PANAMERA(devName, data) 
((IS_SYNAPTICS_PANAMERA(devName) && ((int)data[2] == 
SYNAPTICS_CASCADED_HUB_ID)) ? 1 : 0)
+
 struct amdgpu_display_manager;
 struct amdgpu_dm_connector;
 
-- 
2.34.1