From 345ce3fc9262881343dc6faa4ec132bc21e88756 Mon Sep 17 00:00:00 2001 From: Wenjing Liu Date: Tue, 22 Nov 2022 18:06:28 -0500 Subject: [PATCH] drm/amd/display: add support for three new square pattern variants from DP2.1 specs [why] DP2.1 specs has brought 3 new variants of sqaure patterns with different pre-shoot and de-emphasis equalization requirements. The commit adds logic to identify these variants and apply corresponding eqaulization requirements into hardware lane settings. Reviewed-by: George Shen Acked-by: Jasdeep Dhillon Signed-off-by: Wenjing Liu Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 48 ++++++++++++++++++---- drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 3 ++ .../display/dc/dcn31/dcn31_hpo_dp_link_encoder.c | 5 ++- drivers/gpu/drm/amd/display/include/dpcd_defs.h | 5 ++- .../drm/amd/display/include/link_service_types.h | 7 +++- 5 files changed, 56 insertions(+), 12 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 f283a15..af9411e 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 @@ -4094,6 +4094,12 @@ static void dp_test_send_link_training(struct dc_link *link) dp_retrain_link_dp_test(link, &link_settings, false); } +static bool is_dp_phy_sqaure_pattern(enum dp_test_pattern test_pattern) +{ + return (DP_TEST_PATTERN_SQUARE_BEGIN <= test_pattern && + test_pattern <= DP_TEST_PATTERN_SQUARE_END); +} + /* TODO Raven hbr2 compliance eye output is unstable * (toggling on and off) with debugger break * This caueses intermittent PHY automation failure @@ -4111,6 +4117,8 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link) union lane_adjust dpcd_lane_adjust; unsigned int lane; struct link_training_settings link_training_settings; + unsigned char no_preshoot = 0; + unsigned char no_deemphasis = 0; dpcd_test_pattern.raw = 0; memset(dpcd_lane_adjustment, 0, sizeof(dpcd_lane_adjustment)); @@ -4204,8 +4212,21 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link) case PHY_TEST_PATTERN_264BIT_CUSTOM: test_pattern = DP_TEST_PATTERN_264BIT_CUSTOM; break; - case PHY_TEST_PATTERN_SQUARE_PULSE: - test_pattern = DP_TEST_PATTERN_SQUARE_PULSE; + case PHY_TEST_PATTERN_SQUARE: + test_pattern = DP_TEST_PATTERN_SQUARE; + break; + case PHY_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED: + test_pattern = DP_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED; + no_preshoot = 1; + break; + case PHY_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED: + test_pattern = DP_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED; + no_deemphasis = 1; + break; + case PHY_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED: + test_pattern = DP_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED; + no_preshoot = 1; + no_deemphasis = 1; break; default: test_pattern = DP_TEST_PATTERN_VIDEO_MODE; @@ -4222,7 +4243,7 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link) test_pattern_size); } - if (test_pattern == DP_TEST_PATTERN_SQUARE_PULSE) { + if (is_dp_phy_sqaure_pattern(test_pattern)) { test_pattern_size = 1; // Square pattern data is 1 byte (DP spec) core_link_read_dpcd( link, @@ -4259,8 +4280,10 @@ static void dp_test_send_phy_test_pattern(struct dc_link *link) ((dpcd_post_cursor_2_adjustment >> (lane * 2)) & 0x03); } else if (dp_get_link_encoding_format(&link->cur_link_settings) == DP_128b_132b_ENCODING) { - link_training_settings.hw_lane_settings[lane].FFE_PRESET.raw = + link_training_settings.hw_lane_settings[lane].FFE_PRESET.settings.level = dpcd_lane_adjust.tx_ffe.PRESET_VALUE; + link_training_settings.hw_lane_settings[lane].FFE_PRESET.settings.no_preshoot = no_preshoot; + link_training_settings.hw_lane_settings[lane].FFE_PRESET.settings.no_deemphasis = no_deemphasis; } } @@ -6178,8 +6201,17 @@ bool dc_link_dp_set_test_pattern( case DP_TEST_PATTERN_264BIT_CUSTOM: pattern = PHY_TEST_PATTERN_264BIT_CUSTOM; break; - case DP_TEST_PATTERN_SQUARE_PULSE: - pattern = PHY_TEST_PATTERN_SQUARE_PULSE; + case DP_TEST_PATTERN_SQUARE: + pattern = PHY_TEST_PATTERN_SQUARE; + break; + case DP_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED: + pattern = PHY_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED; + break; + case DP_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED: + pattern = PHY_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED; + break; + case DP_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED: + pattern = PHY_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED; break; default: return false; @@ -6190,14 +6222,12 @@ bool dc_link_dp_set_test_pattern( return false; if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_12) { -#if defined(CONFIG_DRM_AMD_DC_DCN) - if (test_pattern == DP_TEST_PATTERN_SQUARE_PULSE) + if (is_dp_phy_sqaure_pattern(test_pattern)) core_link_write_dpcd(link, DP_LINK_SQUARE_PATTERN, p_custom_pattern, 1); -#endif /* tell receiver that we are sending qualification * pattern DP 1.2 or later - DP receiver's link quality * pattern is set using DPCD LINK_QUAL_LANEx_SET diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index 296793d..73f58ac 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -925,6 +925,9 @@ struct dpcd_usb4_dp_tunneling_info { #ifndef DP_128b_132b_TRAINING_AUX_RD_INTERVAL #define DP_128b_132b_TRAINING_AUX_RD_INTERVAL 0x2216 #endif +#ifndef DP_LINK_SQUARE_PATTERN +#define DP_LINK_SQUARE_PATTERN 0x10F +#endif #ifndef DP_CABLE_ATTRIBUTES_UPDATED_BY_DPRX #define DP_CABLE_ATTRIBUTES_UPDATED_BY_DPRX 0x2217 #endif diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c index 80dfaa4..0b317ed 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_link_encoder.c @@ -242,7 +242,10 @@ void dcn31_hpo_dp_link_enc_set_link_test_pattern( REG_UPDATE(DP_DPHY_SYM32_CONTROL, MODE, DP2_TEST_PATTERN); break; - case DP_TEST_PATTERN_SQUARE_PULSE: + case DP_TEST_PATTERN_SQUARE: + case DP_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED: + case DP_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED: + case DP_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED: REG_SET(DP_DPHY_SYM32_TP_SQ_PULSE, 0, TP_SQ_PULSE_WIDTH, tp_params->custom_pattern[0]); diff --git a/drivers/gpu/drm/amd/display/include/dpcd_defs.h b/drivers/gpu/drm/amd/display/include/dpcd_defs.h index b2df07f..c062a44 100644 --- a/drivers/gpu/drm/amd/display/include/dpcd_defs.h +++ b/drivers/gpu/drm/amd/display/include/dpcd_defs.h @@ -88,7 +88,10 @@ enum dpcd_phy_test_patterns { PHY_TEST_PATTERN_PRBS23 = 0x30, PHY_TEST_PATTERN_PRBS31 = 0x38, PHY_TEST_PATTERN_264BIT_CUSTOM = 0x40, - PHY_TEST_PATTERN_SQUARE_PULSE = 0x48, + PHY_TEST_PATTERN_SQUARE = 0x48, + PHY_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED = 0x49, + PHY_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED = 0x4A, + PHY_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED = 0x4B, }; enum dpcd_test_dyn_range { diff --git a/drivers/gpu/drm/amd/display/include/link_service_types.h b/drivers/gpu/drm/amd/display/include/link_service_types.h index d1e91d3..18b9173 100644 --- a/drivers/gpu/drm/amd/display/include/link_service_types.h +++ b/drivers/gpu/drm/amd/display/include/link_service_types.h @@ -165,7 +165,12 @@ enum dp_test_pattern { DP_TEST_PATTERN_PRBS23, DP_TEST_PATTERN_PRBS31, DP_TEST_PATTERN_264BIT_CUSTOM, - DP_TEST_PATTERN_SQUARE_PULSE, + DP_TEST_PATTERN_SQUARE_BEGIN, + DP_TEST_PATTERN_SQUARE = DP_TEST_PATTERN_SQUARE_BEGIN, + DP_TEST_PATTERN_SQUARE_PRESHOOT_DISABLED, + DP_TEST_PATTERN_SQUARE_DEEMPHASIS_DISABLED, + DP_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED, + DP_TEST_PATTERN_SQUARE_END = DP_TEST_PATTERN_SQUARE_PRESHOOT_DEEMPHASIS_DISABLED, /* Link Training Patterns */ DP_TEST_PATTERN_TRAINING_PATTERN1, -- 2.7.4