drm/amd/display: Fix DP HBR2 Eye Diagram Pattern on Carrizo

[why] dp hbr2 eye diagram pattern for raven asic is not stabled.
workaround is to use tp4 pattern. But this should not be
applied to asic before raven.

[how] add new bool varilable in asic caps. for raven asic,
use the workaround. for carrizo, vega, do not use workaround.

Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 6 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 7857cb42b3e6..bdd121485cbc 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1767,12 +1767,10 @@ static void dp_test_send_link_training(struct dc_link *link)
         dp_retrain_link_dp_test(link, &link_settings, false);
 }
 
-/* TODO hbr2 compliance eye output is unstable
+/* TODO Raven hbr2 compliance eye output is unstable
  * (toggling on and off) with debugger break
  * This caueses intermittent PHY automation failure
  * Need to look into the root cause */
-static uint8_t force_tps4_for_cp2520 = 1;
-
 static void dp_test_send_phy_test_pattern(struct dc_link *link)
 {
         union phy_test_pattern dpcd_test_pattern;
@@ -1832,13 +1830,13 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link)
                 break;
         case PHY_TEST_PATTERN_CP2520_1:
                 /* CP2520 pattern is unstable, temporarily use TPS4 instead */
-                test_pattern = (force_tps4_for_cp2520 == 1) ?
+                test_pattern = (link->dc->caps.force_dp_tps4_for_cp2520 == 1) ?
                                 DP_TEST_PATTERN_TRAINING_PATTERN4 :
                                 DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE;
                 break;
         case PHY_TEST_PATTERN_CP2520_2:
                 /* CP2520 pattern is unstable, temporarily use TPS4 instead */
-                test_pattern = (force_tps4_for_cp2520 == 1) ?
+                test_pattern = (link->dc->caps.force_dp_tps4_for_cp2520 == 1) ?
                                 DP_TEST_PATTERN_TRAINING_PATTERN4 :
                                 DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE;
                 break;
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 9cfde0ccf4e9..53c71296f3dd 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -76,6 +76,7 @@ struct dc_caps {
         bool is_apu;
         bool dual_link_dvi;
         bool post_blend_color_processing;
+        bool force_dp_tps4_for_cp2520;
 };
 
 struct dc_dcc_surface_param {
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
index df5cb2d1d164..34dac84066a0 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c
@@ -1027,6 +1027,8 @@ static bool construct(
         dc->caps.max_slave_planes = 1;
         dc->caps.is_apu = true;
         dc->caps.post_blend_color_processing = false;
+        /* Raven DP PHY HBR2 eye diagram pattern is not stable. Use TP4 */
+        dc->caps.force_dp_tps4_for_cp2520 = true;
 
         if (dc->ctx->dce_environment == DCE_ENV_PRODUCTION_DRV)
                 dc->debug = debug_defaults_drv;