drm/i915: Try harder during dp pattern 1 link training

Instead of going through the sequence just once, run through the whole
set up to 5 times to see if something can work. This isn't part of the
DP spec, but the BIOS seems to do it, and given that link training
failure is so bad, it seems reasonable to follow suit.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 8e37fdd1fa2f9a80ab19dd40ecbe046f8d308164..7101b8b4f8b4593a688efd2c4f165383bbad2d9d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1581,7 +1581,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
        int i;
        uint8_t voltage;
        bool clock_recovery = false;
-       int tries;
+       int voltage_tries, loop_tries;
        u32 reg;
        uint32_t DP = intel_dp->DP;
 
@@ -1608,7 +1608,8 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
                DP &= ~DP_LINK_TRAIN_MASK;
        memset(intel_dp->train_set, 0, 4);
        voltage = 0xff;
-       tries = 0;
+       voltage_tries = 0;
+       loop_tries = 0;
        clock_recovery = false;
        for (;;) {
                /* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
@@ -1651,16 +1652,26 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
                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)
-                       break;
+               if (i == intel_dp->lane_count) {
+                       ++loop_tries;
+                       if (loop_tries == 5) {
+                               DRM_DEBUG_KMS("too many full retries, give up\n");
+                               break;
+                       }
+                       memset(intel_dp->train_set, 0, 4);
+                       voltage_tries = 0;
+                       continue;
+               }
 
                /* Check to see if we've tried the same voltage 5 times */
                if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
-                       ++tries;
-                       if (tries == 5)
+                       ++voltage_tries;
+                       if (voltage_tries == 5) {
+                               DRM_DEBUG_KMS("too many voltage retries, give up\n");
                                break;
+                       }
                } else
-                       tries = 0;
+                       voltage_tries = 0;
                voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 
                /* Compute new intel_dp->train_set as requested by target */