drm/i915/mst: abstract intel_dp_mst_source_support()

Add a function for checking source MST support. Drop intel_dp->can_mst
and use intel_dp->mst_mgr.cbs to indicate the same. It's the single
point of truth without additional state variables. In code, "source
support" is also self-documenting as opposed to the vague "can mst".

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211006101618.22066-1-jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
index 309d74f..bc51135 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
+++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
@@ -7,12 +7,13 @@
 #include <drm/drm_fourcc.h>
 
 #include "i915_debugfs.h"
+#include "intel_de.h"
 #include "intel_display_debugfs.h"
 #include "intel_display_power.h"
-#include "intel_de.h"
 #include "intel_display_types.h"
 #include "intel_dmc.h"
 #include "intel_dp.h"
+#include "intel_dp_mst.h"
 #include "intel_drrs.h"
 #include "intel_fbc.h"
 #include "intel_hdcp.h"
@@ -1379,7 +1380,7 @@ static int i915_dp_mst_info(struct seq_file *m, void *unused)
                        continue;
 
                dig_port = enc_to_dig_port(intel_encoder);
-               if (!dig_port->dp.can_mst)
+               if (!intel_dp_mst_source_support(&dig_port->dp))
                        continue;
 
                seq_printf(m, "MST Source Port [ENCODER:%d:%s]\n",

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index a811e13..004fc0a 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1574,7 +1574,6 @@ struct intel_dp {
 
        struct intel_pps pps;
 
-       bool can_mst; /* this port supports mst */
        bool is_mst;
        int active_mst_links;
 

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f6b26ce..10fda20 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2667,7 +2667,7 @@ intel_dp_can_mst(struct intel_dp *intel_dp)
        struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 
        return i915->params.enable_dp_mst &&
-               intel_dp->can_mst &&
+               intel_dp_mst_source_support(intel_dp) &&
                drm_dp_read_mst_cap(&intel_dp->aux, intel_dp->dpcd);
 }
 
@@ -2682,10 +2682,10 @@ intel_dp_configure_mst(struct intel_dp *intel_dp)
        drm_dbg_kms(&i915->drm,
                    "[ENCODER:%d:%s] MST support: port: %s, sink: %s, modparam: %s\n",
                    encoder->base.base.id, encoder->base.name,
-                   yesno(intel_dp->can_mst), yesno(sink_can_mst),
+                   yesno(intel_dp_mst_source_support(intel_dp)), yesno(sink_can_mst),
                    yesno(i915->params.enable_dp_mst));
 
-       if (!intel_dp->can_mst)
+       if (!intel_dp_mst_source_support(intel_dp))
                return;
 
        intel_dp->is_mst = sink_can_mst &&
@@ -5085,7 +5085,7 @@ void intel_dp_mst_suspend(struct drm_i915_private *dev_priv)
 
                intel_dp = enc_to_intel_dp(encoder);
 
-               if (!intel_dp->can_mst)
+               if (!intel_dp_mst_source_support(intel_dp))
                        continue;
 
                if (intel_dp->is_mst)
@@ -5109,7 +5109,7 @@ void intel_dp_mst_resume(struct drm_i915_private *dev_priv)
 
                intel_dp = enc_to_intel_dp(encoder);
 
-               if (!intel_dp->can_mst)
+               if (!intel_dp_mst_source_support(intel_dp))
                        continue;
 
                ret = drm_dp_mst_topology_mgr_resume(&intel_dp->mst_mgr,

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index fd0a31b..0de0b4f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -977,24 +977,31 @@ intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
                                           dig_port->max_lanes,
                                           max_source_rate,
                                           conn_base_id);
-       if (ret)
+       if (ret) {
+               intel_dp->mst_mgr.cbs = NULL;
                return ret;
-
-       intel_dp->can_mst = true;
+       }
 
        return 0;
 }
 
+bool intel_dp_mst_source_support(struct intel_dp *intel_dp)
+{
+       return intel_dp->mst_mgr.cbs;
+}
+
 void
 intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port)
 {
        struct intel_dp *intel_dp = &dig_port->dp;
 
-       if (!intel_dp->can_mst)
+       if (!intel_dp_mst_source_support(intel_dp))
                return;
 
        drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
        /* encoders will get killed by normal cleanup */
+
+       intel_dp->mst_mgr.cbs = NULL;
 }
 
 bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h b/drivers/gpu/drm/i915/display/intel_dp_mst.h
index 6afda4e..f7301de 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h
@@ -8,13 +8,15 @@
 
 #include <linux/types.h>
 
-struct intel_digital_port;
 struct intel_crtc_state;
+struct intel_digital_port;
+struct intel_dp;
 
 int intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_id);
 void intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port);
 int intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port);
 bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state);
 bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state);
+bool intel_dp_mst_source_support(struct intel_dp *intel_dp);
 
 #endif /* __INTEL_DP_MST_H__ */