[PATCH 02/16] drm/amd/display: Allow DSC on supported MST branch devices

[Bhawanpreet Lakha]

From: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>

[Why]
When trying to lightup two 4k60 non-DSC displays behind a branch device
that supports DSC we can't lightup both at once due to bandwidth
limitations - each requires 48 VCPI slots but we only have 63.

[How]
The workaround already exists in the code but is guarded by a CONFIG
that cannot be set by the user and shouldn't need to be.

Check for specific branch device IDs to device whether to enable
the workaround for multiple display scenarios.

Reviewed-by: Hersen Wu <hersenxs...@amd.com>
Acked-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
---
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   | 20 +++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

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 32a5ce09a62a..cc34a35d0bcb 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
@@ -36,6 +36,8 @@
 #include "dm_helpers.h"
 
 #include "dc_link_ddc.h"
+#include "ddc_service_types.h"
+#include "dpcd_defs.h"
 
 #include "i2caux_interface.h"
 #include "dmub_cmd.h"
@@ -157,6 +159,16 @@ static const struct drm_connector_funcs 
dm_dp_mst_connector_funcs = {
 };
 
 #if defined(CONFIG_DRM_AMD_DC_DCN)
+static bool needs_dsc_aux_workaround(struct dc_link *link)
+{
+       if (link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
+           (link->dpcd_caps.dpcd_rev.raw == DPCD_REV_14 || 
link->dpcd_caps.dpcd_rev.raw == DPCD_REV_12) &&
+           link->dpcd_caps.sink_count.bits.SINK_COUNT >= 2)
+               return true;
+
+       return false;
+}
+
 static bool validate_dsc_caps_on_connector(struct amdgpu_dm_connector 
*aconnector)
 {
        struct dc_sink *dc_sink = aconnector->dc_sink;
@@ -166,7 +178,7 @@ static bool validate_dsc_caps_on_connector(struct 
amdgpu_dm_connector *aconnecto
        u8 *dsc_branch_dec_caps = NULL;
 
        aconnector->dsc_aux = drm_dp_mst_dsc_aux_for_port(port);
-#if defined(CONFIG_HP_HOOK_WORKAROUND)
+
        /*
         * drm_dp_mst_dsc_aux_for_port() will return NULL for certain configs
         * because it only check the dsc/fec caps of the "port variable" and 
not the dock
@@ -176,10 +188,10 @@ static bool validate_dsc_caps_on_connector(struct 
amdgpu_dm_connector *aconnecto
         * Workaround: explicitly check the use case above and use the mst 
dock's aux as dsc_aux
         *
         */
-
-       if (!aconnector->dsc_aux && !port->parent->port_parent)
+       if (!aconnector->dsc_aux && !port->parent->port_parent &&
+           needs_dsc_aux_workaround(aconnector->dc_link))
                aconnector->dsc_aux = &aconnector->mst_port->dm_dp_aux.aux;
-#endif
+
        if (!aconnector->dsc_aux)
                return false;
 
-- 
2.25.1