drm/i915/dp_link_caps: Use max common lane count from link_caps

Convert all users of intel_dp_max_common_lane_count() to query the
maximum common lane count via the link capability API, in common with
the link rate queries.

Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260616200849.3534628-21-imre.deak@intel.com

6 files changed, 10 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8beddb21a9b1..e5492996b9e4 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1836,7 +1836,6 @@ struct intel_dp {
 	bool use_rate_select;
 	/* Max sink lane count as reported by DP_MAX_LANE_COUNT */
 	int max_sink_lane_count;
-	int max_common_lane_count;
 	struct {
 		/* TODO: move the rest of link specific fields to here */
 		bool active;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 43b496f91f08..c06d575ebd32 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -354,11 +354,6 @@ static int intel_dp_get_max_common_lane_count(struct intel_dp *intel_dp)
 	return min3(source_max, sink_max, lane_max);
 }
 
-int intel_dp_max_common_lane_count(struct intel_dp *intel_dp)
-{
-	return intel_dp->max_common_lane_count;
-}
-
 int intel_dp_max_lane_count(struct intel_dp *intel_dp)
 {
 	struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
@@ -701,8 +696,6 @@ static bool intel_dp_set_common_link_params(struct intel_dp *intel_dp)
 	int common_rates[DP_MAX_SUPPORTED_RATES];
 	bool params_changed = false;
 
-	intel_dp->max_common_lane_count = intel_dp_get_max_common_lane_count(intel_dp);
-
 	intel_dp_get_common_rates(intel_dp, common_rates, &num_common_rates);
 	if (intel_dp_link_caps_update(intel_dp,
 				      common_rates, num_common_rates,
@@ -3613,7 +3606,7 @@ void intel_dp_set_link_params(struct intel_dp *intel_dp,
 
 void intel_dp_reset_link_params(struct intel_dp *intel_dp)
 {
-	intel_dp->link.max_lane_count = intel_dp_max_common_lane_count(intel_dp);
+	intel_dp->link.max_lane_count = intel_dp_link_caps_max_common_lane_count(intel_dp->link.caps);
 	intel_dp->link.max_rate = intel_dp_max_common_rate(intel_dp);
 	intel_dp->link.mst_probed_lane_count = 0;
 	intel_dp->link.mst_probed_rate = 0;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index fcf213775bdf..02b691df6755 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -107,7 +107,6 @@ int intel_dp_max_link_rate(struct intel_dp *intel_dp);
 int intel_dp_max_lane_count(struct intel_dp *intel_dp);
 int intel_dp_config_required_rate(const struct intel_crtc_state *crtc_state);
 int intel_dp_rate_select(struct intel_dp *intel_dp, int rate);
-int intel_dp_max_common_lane_count(struct intel_dp *intel_dp);
 int intel_dp_rate_index(const int *rates, int len, int rate);
 void intel_dp_update_sink_caps(struct intel_dp *intel_dp);
 void intel_dp_reset_link_params(struct intel_dp *intel_dp);
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 bb727bcf4de1..b227c9a55f63 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.c
@@ -102,6 +102,11 @@ void intel_dp_link_caps_print_common_rates(struct intel_dp_link_caps *link_caps)
 	drm_dbg_kms(display->drm, "common rates: %s\n", seq_buf_str(&s));
 }
 
+int intel_dp_link_caps_max_common_lane_count(struct intel_dp_link_caps *link_caps)
+{
+	return link_caps->max_lane_count;
+}
+
 static int forced_lane_count(struct intel_dp *intel_dp)
 {
 	struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
@@ -110,7 +115,7 @@ static int forced_lane_count(struct intel_dp *intel_dp)
 		return 0;
 
 	return clamp(link_caps->forced_params.lane_count,
-		     1, intel_dp_max_common_lane_count(intel_dp));
+		     1, intel_dp_link_caps_max_common_lane_count(link_caps));
 }
 
 static int forced_link_rate(struct intel_dp *intel_dp)
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 e2f53eb167a8..9218cb5de2c7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
+++ b/drivers/gpu/drm/i915/display/intel_dp_link_caps.h
@@ -17,6 +17,7 @@ int intel_dp_common_rate(struct intel_dp *intel_dp, int index);
 int intel_dp_link_caps_common_rate_idx(struct intel_dp_link_caps *link_caps, int rate);
 int intel_dp_max_common_rate(struct intel_dp *intel_dp);
 int intel_dp_link_caps_num_common_rates(struct intel_dp_link_caps *link_caps);
+int intel_dp_link_caps_max_common_lane_count(struct intel_dp_link_caps *link_caps);
 
 void intel_dp_link_caps_print_common_rates(struct intel_dp_link_caps *link_caps);
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp_tunnel.c b/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
index c82adfcce01d..9d9d8d04742b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_tunnel.c
@@ -57,8 +57,9 @@ static int kbytes_to_mbits(int kbytes)
 
 static int get_current_link_bw(struct intel_dp *intel_dp)
 {
+	struct intel_dp_link_caps *link_caps = intel_dp->link.caps;
 	int rate = intel_dp_max_common_rate(intel_dp);
-	int lane_count = intel_dp_max_common_lane_count(intel_dp);
+	int lane_count = intel_dp_link_caps_max_common_lane_count(link_caps);
 
 	return intel_dp_max_link_data_rate(intel_dp, rate, lane_count);
 }