[PATCH v2 13/34] drm/i915/dp_link_caps: Add helper to query max BW link configuration

[Imre Deak <imre.deak@intel.com>]

Add a helper to query the link configuration among the currently allowed
configurations with the maximum link BW.

This will be used by follow-up changes to unify the max BW link config
query during mode validation and TBT BW calculation.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 .../gpu/drm/i915/display/intel_dp_link_caps.c   | 17 +++++++++++++++++
 .../gpu/drm/i915/display/intel_dp_link_caps.h   |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
index d00bb8047de2f..c209c8a935234 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
@@ -550,6 +550,23 @@ bool intel_dp_link_caps_get_max_config(struct intel_dp_link_caps *link_caps,
 	return true;
 }
 
+/**
+ * intel_dp_link_caps_get_max_bw_config - get maximum BW link configuration
+ * @link_caps: link capabilities state
+ * @max_config: returned maximum link configuration
+ *
+ * Return the maximum BW link configuration among the currently
+ * allowed configurations.
+ */
+void intel_dp_link_caps_get_max_bw_config(struct intel_dp_link_caps *link_caps,
+					  struct intel_dp_link_config *max_config)
+{
+	if (!intel_dp_link_caps_get_max_config(link_caps,
+					       bw_desc_config_order().key, INTEL_DP_LINK_CAPS_FILTER_ALL,
+					       max_config))
+		*max_config = INTEL_DP_LINK_CONFIG_NULL;
+}
+
 static int find_config_idx(struct intel_dp_link_caps *link_caps,
 			   struct intel_dp_link_caps_filter filter,
 			   const struct intel_dp_link_config *link_config)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_caps.h b/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
index 6dd2ce64e24ed..667bd70b2396d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
@@ -146,6 +146,9 @@ bool intel_dp_link_caps_get_max_config(struct intel_dp_link_caps *link_caps,
 				       struct intel_dp_link_caps_filter filter,
 				       struct intel_dp_link_config *max_config);
 
+void intel_dp_link_caps_get_max_bw_config(struct intel_dp_link_caps *link_caps,
+					  struct intel_dp_link_config *max_config);
+
 void intel_dp_link_caps_get_max_limits(struct intel_dp_link_caps *link_caps,
 				       struct intel_dp_link_config *max_link_limits);
 bool intel_dp_link_caps_set_max_limits(struct intel_dp_link_caps *link_caps,
-- 
2.49.1