drm/i915/dp: reduce missing TPS3 support errors to debug logging

Per spec, TPS3 support is mandatory for downstream devices that support
HBR2. We've therefore logged errors on HBR2 without TPS3 since

commit 1da7d7131c35cde83f1bab8ec732b57b69bef814
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Thu Sep 3 11:16:08 2015 +0300

    drm/i915: ignore link rate in TPS3 selection

However, it seems there are real world devices out there that just
aren't spec compliant, and still work at HBR2 using TPS2. So reduce the
error message to debug logging.

Cc: Ander Conselvan de Oliveira <conselvan2@gmail.com>
Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92932
Fixes: 1da7d7131c35 ("drm/i915: ignore link rate in TPS3 selection")
Cc: drm-intel-fixes@lists.freedesktop.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1454667370-8001-2-git-send-email-jani.nikula@intel.com
(cherry picked from commit bfcef5d2135ea1200ac1ea44661619ab8785c9f0)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c b/drivers/gpu/drm/i915/intel_dp_link_training.c
index 83e667b..0b8eefc 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
@@ -222,19 +222,27 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp)
 static u32 intel_dp_training_pattern(struct intel_dp *intel_dp)
 {
        u32 training_pattern = DP_TRAINING_PATTERN_2;
+       bool source_tps3, sink_tps3;
 
        /*
         * Intel platforms that support HBR2 also support TPS3. TPS3 support is
-        * also mandatory for downstream devices that support HBR2.
+        * also mandatory for downstream devices that support HBR2. However, not
+        * all sinks follow the spec.
         *
         * Due to WaDisableHBR2 SKL < B0 is the only exception where TPS3 is
-        * supported but still not enabled.
+        * supported in source but still not enabled.
         */
-       if (intel_dp_source_supports_hbr2(intel_dp) &&
-           drm_dp_tps3_supported(intel_dp->dpcd))
+       source_tps3 = intel_dp_source_supports_hbr2(intel_dp);
+       sink_tps3 = drm_dp_tps3_supported(intel_dp->dpcd);
+
+       if (source_tps3 && sink_tps3) {
                training_pattern = DP_TRAINING_PATTERN_3;
-       else if (intel_dp->link_rate == 540000)
-               DRM_ERROR("5.4 Gbps link rate without HBR2/TPS3 support\n");
+       } else if (intel_dp->link_rate == 540000) {
+               if (!source_tps3)
+                       DRM_DEBUG_KMS("5.4 Gbps link rate without source HBR2/TPS3 support\n");
+               if (!sink_tps3)
+                       DRM_DEBUG_KMS("5.4 Gbps link rate without sink TPS3 support\n");
+       }
 
        return training_pattern;
 }