drm/i915/dp: Move max. vswing check to it's own function

Wrap the max. vswing check in a separate function.
This makes the clock recovery phase of DP link training cleaner

v3:
Fixed the paranthesis warning (Mika Kahola)
v2:
Fixed the Compiler warning (Mika Kahola)

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c b/drivers/gpu/drm/i915/intel_dp_link_training.c
index 0deebed71a26..b9880cf0ae6c 100644
--- a/drivers/gpu/drm/i915/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
@@ -112,6 +112,18 @@ intel_dp_update_link_train(struct intel_dp *intel_dp)
         return ret == intel_dp->lane_count;
 }
 
+static bool intel_dp_link_max_vswing_reached(struct intel_dp *intel_dp)
+{
+        int lane;
+
+        for (lane = 0; lane < intel_dp->lane_count; lane++)
+                if ((intel_dp->train_set[lane] &
+                     DP_TRAIN_MAX_SWING_REACHED) == 0)
+                        return false;
+
+        return true;
+}
+
 /* Enable corresponding port and start training pattern 1 */
 static void
 intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp)
@@ -170,10 +182,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp)
                 }
 
                 /* Check to see if we've tried the max voltage */
-                for (i = 0; i < intel_dp->lane_count; i++)
-                        if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
-                                break;
-                if (i == intel_dp->lane_count) {
+                if (intel_dp_link_max_vswing_reached(intel_dp)) {
                         ++loop_tries;
                         if (loop_tries == 5) {
                                 DRM_ERROR("too many full retries, give up\n");