diff options
author | David Galiffi <david.galiffi@amd.com> | 2019-06-24 10:34:13 -0400 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2019-08-15 10:53:30 -0500 |
commit | 0b226322434c7786381d7a594efca9cc46f85211 (patch) | |
tree | 77444e6807ceac9e22bf0f4344af6d76604c7a01 /drivers | |
parent | 36756dcbcf474466f7243fcec21af90ee40e72be (diff) | |
download | linux-stable-0b226322434c7786381d7a594efca9cc46f85211.tar.gz linux-stable-0b226322434c7786381d7a594efca9cc46f85211.tar.bz2 linux-stable-0b226322434c7786381d7a594efca9cc46f85211.zip |
drm/amd/display: Synchronous DisplayPort Link Training
[WHY]
We require a method to perform synchronous link training.
[HOW]
Sync LT is broken into 3 basic steps.
"Begin" starts the state machine, and resets "preferred" link settings.
"Attempt" will attempt to train the link with a given set of training
parameters.
"End" stops the state machine, and will optionally disable the link phy.
Between "Begin" and "End" DPCD:600h must not be set to "2"
(D3:Powered Down).
Between "Begin" and "End", there may be multiple "Attempts" with different
training parameters.
Signed-off-by: David Galiffi <david.galiffi@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 53 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 293 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c | 43 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 3 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_link.h | 10 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h | 3 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/inc/link_hwss.h | 2 |
7 files changed, 282 insertions, 125 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 193d6f14e684..0a66a6f21f58 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1387,57 +1387,6 @@ void link_destroy(struct dc_link **link) *link = NULL; } -static void dpcd_configure_panel_mode( - struct dc_link *link, - enum dp_panel_mode panel_mode) -{ - union dpcd_edp_config edp_config_set; - bool panel_mode_edp = false; - DC_LOGGER_INIT(link->ctx->logger); - - memset(&edp_config_set, '\0', sizeof(union dpcd_edp_config)); - - if (DP_PANEL_MODE_DEFAULT != panel_mode) { - - switch (panel_mode) { - case DP_PANEL_MODE_EDP: - case DP_PANEL_MODE_SPECIAL: - panel_mode_edp = true; - break; - - default: - break; - } - - /*set edp panel mode in receiver*/ - core_link_read_dpcd( - link, - DP_EDP_CONFIGURATION_SET, - &edp_config_set.raw, - sizeof(edp_config_set.raw)); - - if (edp_config_set.bits.PANEL_MODE_EDP - != panel_mode_edp) { - enum ddc_result result = DDC_RESULT_UNKNOWN; - - edp_config_set.bits.PANEL_MODE_EDP = - panel_mode_edp; - result = core_link_write_dpcd( - link, - DP_EDP_CONFIGURATION_SET, - &edp_config_set.raw, - sizeof(edp_config_set.raw)); - - ASSERT(result == DDC_RESULT_SUCESSFULL); - } - } - DC_LOG_DETECTION_DP_CAPS("Link: %d eDP panel mode supported: %d " - "eDP panel mode enabled: %d \n", - link->link_index, - link->dpcd_caps.panel_mode_edp, - panel_mode_edp); -} - static void enable_stream_features(struct pipe_ctx *pipe_ctx) { struct dc_stream_state *stream = pipe_ctx->stream; @@ -1508,7 +1457,7 @@ static enum dc_status enable_link_dp( } panel_mode = dp_get_panel_mode(link); - dpcd_configure_panel_mode(link, panel_mode); + dp_set_panel_mode(link, panel_mode); skip_video_pattern = true; 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 08bd9c96b9b0..8e66b2e9d6af 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 @@ -965,6 +965,7 @@ static inline enum link_training_result perform_link_training_int( static void initialize_training_settings( struct dc_link *link, const struct dc_link_settings *link_setting, + const struct dc_link_training_overrides *overrides, struct link_training_settings *lt_settings) { uint32_t lane; @@ -997,23 +998,23 @@ static void initialize_training_settings( /* Initialize link spread */ if (link->dp_ss_off) lt_settings->link_settings.link_spread = LINK_SPREAD_DISABLED; - else if (link->preferred_training_settings.downspread != NULL) + else if (overrides->downspread != NULL) lt_settings->link_settings.link_spread - = *link->preferred_training_settings.downspread + = *overrides->downspread ? LINK_SPREAD_05_DOWNSPREAD_30KHZ : LINK_SPREAD_DISABLED; else lt_settings->link_settings.link_spread = LINK_SPREAD_05_DOWNSPREAD_30KHZ; /* Initialize lane settings overrides */ - if (link->preferred_training_settings.voltage_swing != NULL) - lt_settings->voltage_swing = link->preferred_training_settings.voltage_swing; + if (overrides->voltage_swing != NULL) + lt_settings->voltage_swing = overrides->voltage_swing; - if (link->preferred_training_settings.pre_emphasis != NULL) - lt_settings->pre_emphasis = link->preferred_training_settings.pre_emphasis; + if (overrides->pre_emphasis != NULL) + lt_settings->pre_emphasis = overrides->pre_emphasis; - if (link->preferred_training_settings.post_cursor2 != NULL) - lt_settings->post_cursor2 = link->preferred_training_settings.post_cursor2; + if (overrides->post_cursor2 != NULL) + lt_settings->post_cursor2 = overrides->post_cursor2; /* Initialize lane settings (VS/PE/PC2) */ for (lane = 0; lane < LANE_COUNT_DP_MAX; lane++) { @@ -1032,23 +1033,23 @@ static void initialize_training_settings( } /* Initialize training timings */ - if (link->preferred_training_settings.cr_pattern_time != NULL) - lt_settings->cr_pattern_time = *link->preferred_training_settings.cr_pattern_time; + if (overrides->cr_pattern_time != NULL) + lt_settings->cr_pattern_time = *overrides->cr_pattern_time; else - lt_settings->cr_pattern_time = 100; + lt_settings->cr_pattern_time = get_training_aux_rd_interval(link, 100); - if (link->preferred_training_settings.eq_pattern_time != NULL) - lt_settings->eq_pattern_time = *link->preferred_training_settings.eq_pattern_time; + if (overrides->eq_pattern_time != NULL) + lt_settings->eq_pattern_time = *overrides->eq_pattern_time; else lt_settings->eq_pattern_time = get_training_aux_rd_interval(link, 400); - if (link->preferred_training_settings.pattern_for_eq != NULL) - lt_settings->pattern_for_eq = *link->preferred_training_settings.pattern_for_eq; + if (overrides->pattern_for_eq != NULL) + lt_settings->pattern_for_eq = *overrides->pattern_for_eq; else lt_settings->pattern_for_eq = get_supported_tp(link); - if (link->preferred_training_settings.enhanced_framing != NULL) - lt_settings->enhanced_framing = *link->preferred_training_settings.enhanced_framing; + if (overrides->enhanced_framing != NULL) + lt_settings->enhanced_framing = *overrides->enhanced_framing; else lt_settings->enhanced_framing = 1; } @@ -1139,7 +1140,11 @@ bool dc_link_dp_perform_link_training_skip_aux( struct link_training_settings lt_settings; enum dc_dp_training_pattern pattern_for_cr = DP_TRAINING_PATTERN_SEQUENCE_1; - initialize_training_settings(link, link_setting, <_settings); + initialize_training_settings( + link, + link_setting, + &link->preferred_training_settings, + <_settings); /* 1. Perform_clock_recovery_sequence. */ @@ -1184,7 +1189,11 @@ enum link_training_result dc_link_dp_perform_link_training( bool fec_enable; #endif - initialize_training_settings(link, link_setting, <_settings); + initialize_training_settings( + link, + link_setting, + &link->preferred_training_settings, + <_settings); /* 1. set link rate, lane count and spread. */ dpcd_set_link_settings(link, <_settings); @@ -1247,6 +1256,146 @@ bool perform_link_training_with_retries( return false; } +static enum clock_source_id get_clock_source_id(struct dc_link *link) +{ + enum clock_source_id dp_cs_id = CLOCK_SOURCE_ID_UNDEFINED; + struct clock_source *dp_cs = link->dc->res_pool->dp_clock_source; + + if (dp_cs != NULL) { + dp_cs_id = dp_cs->id; + } else { + /* + * dp clock source is not initialized for some reason. + * Should not happen, CLOCK_SOURCE_ID_EXTERNAL will be used + */ + ASSERT(dp_cs); + } + + return dp_cs_id; +} + +static void set_dp_mst_mode(struct dc_link *link, bool mst_enable) +{ + if (mst_enable == false && + link->type == dc_connection_mst_branch) { + /* Disable MST on link. Use only local sink. */ + dp_disable_link_phy_mst(link, link->connector_signal); + + link->type = dc_connection_single; + link->local_sink = link->remote_sinks[0]; + link->local_sink->sink_signal = SIGNAL_TYPE_DISPLAY_PORT; + } else if (mst_enable == true && + link->type == dc_connection_single && + link->remote_sinks[0] != NULL) { + /* Re-enable MST on link. */ + dp_disable_link_phy(link, link->connector_signal); + dp_enable_mst_on_sink(link, true); + + link->type = dc_connection_mst_branch; + link->local_sink->sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST; + } +} + +bool dc_link_dp_sync_lt_begin(struct dc_link *link) +{ + /* Begin Sync LT. During this time, + * DPCD:600h must not be powered down. + */ + link->sync_lt_in_progress = true; + + /*Clear any existing preferred settings.*/ + memset(&link->preferred_training_settings, 0, + sizeof(struct dc_link_training_overrides)); + memset(&link->preferred_link_setting, 0, + sizeof(struct dc_link_settings)); + + return true; +} + +enum link_training_result dc_link_dp_sync_lt_attempt( + struct dc_link *link, + struct dc_link_settings *link_settings, + struct dc_link_training_overrides *lt_overrides) +{ + struct link_training_settings lt_settings; + enum link_training_result lt_status = LINK_TRAINING_SUCCESS; + enum dp_panel_mode panel_mode = DP_PANEL_MODE_DEFAULT; + enum clock_source_id dp_cs_id = CLOCK_SOURCE_ID_EXTERNAL; +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT + bool fec_enable = false; +#endif + + initialize_training_settings( + link, + link_settings, + lt_overrides, + <_settings); + + /* Setup MST Mode */ + if (lt_overrides->mst_enable) + set_dp_mst_mode(link, *lt_overrides->mst_enable); + + /* Disable link */ + dp_disable_link_phy(link, link->connector_signal); + + /* Enable link */ + dp_cs_id = get_clock_source_id(link); + dp_enable_link_phy(link, link->connector_signal, + dp_cs_id, link_settings); + +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT + /* Set FEC enable */ + fec_enable = lt_overrides->fec_enable && *lt_overrides->fec_enable; + dp_set_fec_ready(link, fec_enable); +#endif + + if (lt_overrides->alternate_scrambler_reset) { + if (*lt_overrides->alternate_scrambler_reset) + panel_mode = DP_PANEL_MODE_EDP; + else + panel_mode = DP_PANEL_MODE_DEFAULT; + } else + panel_mode = dp_get_panel_mode(link); + + dp_set_panel_mode(link, panel_mode); + + /* Attempt to train with given link training settings */ + + /* Set link rate, lane count and spread. */ + dpcd_set_link_settings(link, <_settings); + + /* 2. perform link training (set link training done + * to false is done as well) + */ + lt_status = perform_clock_recovery_sequence(link, <_settings); + if (lt_status == LINK_TRAINING_SUCCESS) { + lt_status = perform_channel_equalization_sequence(link, + <_settings); + } + + /* 3. Sync LT must skip TRAINING_PATTERN_SET:0 (video pattern)*/ + /* 4. print status message*/ + print_status_message(link, <_settings, lt_status); + + return lt_status; +} + +bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down) +{ + /* If input parameter is set, shut down phy. + * Still shouldn't turn off dp_receiver (DPCD:600h) + */ + if (link_down == true) { + dp_disable_link_phy(link, link->connector_signal); +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT + dp_set_fec_ready(link, false); +#endif + } + + link->sync_lt_in_progress = false; + return true; +} + static struct dc_link_settings get_max_link_cap(struct dc_link *link) { /* Set Default link settings */ @@ -1401,7 +1550,6 @@ bool dp_verify_link_cap( bool success; bool skip_link_training; bool skip_video_pattern; - struct clock_source *dp_cs; enum clock_source_id dp_cs_id = CLOCK_SOURCE_ID_EXTERNAL; enum link_training_result status; union hpd_irq_data irq_data; @@ -1425,17 +1573,7 @@ bool dp_verify_link_cap( /* disable PHY done possible by BIOS, will be done by driver itself */ dp_disable_link_phy(link, link->connector_signal); - dp_cs = link->dc->res_pool->dp_clock_source; - - if (dp_cs) - dp_cs_id = dp_cs->id; - else { - /* - * dp clock source is not initialized for some reason. - * Should not happen, CLOCK_SOURCE_ID_EXTERNAL will be used - */ - ASSERT(dp_cs); - } + dp_cs_id = get_clock_source_id(link); /* link training starts with the maximum common settings * supported by both sink and ASIC. @@ -2307,6 +2445,11 @@ bool is_mst_supported(struct dc_link *link) union dpcd_rev rev; union mstm_cap cap; + if (link->preferred_training_settings.mst_enable && + *link->preferred_training_settings.mst_enable == false) { + return false; + } + rev.raw = 0; cap.raw = 0; @@ -3158,6 +3301,94 @@ void dp_enable_mst_on_sink(struct dc_link *link, bool enable) core_link_write_dpcd(link, DP_MSTM_CTRL, &mstmCntl, 1); } +void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode) +{ + union dpcd_edp_config edp_config_set; + bool panel_mode_edp = false; + + memset(&edp_config_set, '\0', sizeof(union dpcd_edp_config)); + + if (panel_mode != DP_PANEL_MODE_DEFAULT) { + + switch (panel_mode) { + case DP_PANEL_MODE_EDP: + case DP_PANEL_MODE_SPECIAL: + panel_mode_edp = true; + break; + + default: + break; + } + + /*set edp panel mode in receiver*/ + core_link_read_dpcd( + link, + DP_EDP_CONFIGURATION_SET, + &edp_config_set.raw, + sizeof(edp_config_set.raw)); + + if (edp_config_set.bits.PANEL_MODE_EDP + != panel_mode_edp) { + enum ddc_result result = DDC_RESULT_UNKNOWN; + + edp_config_set.bits.PANEL_MODE_EDP = + panel_mode_edp; + result = core_link_write_dpcd( + link, + DP_EDP_CONFIGURATION_SET, + &edp_config_set.raw, + sizeof(edp_config_set.raw)); + + ASSERT(result == DDC_RESULT_SUCESSFULL); + } + } + DC_LOG_DETECTION_DP_CAPS("Link: %d eDP panel mode supported: %d " + "eDP panel mode enabled: %d \n", + link->link_index, + link->dpcd_caps.panel_mode_edp, + panel_mode_edp); +} + +enum dp_panel_mode dp_get_panel_mode(struct dc_link *link) +{ + /* We need to explicitly check that connector + * is not DP. Some Travis_VGA get reported + * by video bios as DP. + */ + if (link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT) { + + switch (link->dpcd_caps.branch_dev_id) { + case DP_BRANCH_DEVICE_ID_2: + if (strncmp( + link->dpcd_caps.branch_dev_name, + DP_VGA_LVDS_CONVERTER_ID_2, + sizeof( + link->dpcd_caps. + branch_dev_name)) == 0) { + return DP_PANEL_MODE_SPECIAL; + } + break; + case DP_BRANCH_DEVICE_ID_3: + if (strncmp(link->dpcd_caps.branch_dev_name, + DP_VGA_LVDS_CONVERTER_ID_3, + sizeof( + link->dpcd_caps. + branch_dev_name)) == 0) { + return DP_PANEL_MODE_SPECIAL; + } + break; + default: + break; + } + } + + if (link->dpcd_caps.panel_mode_edp) { + return DP_PANEL_MODE_EDP; + } + + return DP_PANEL_MODE_DEFAULT; +} + #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT void dp_set_fec_ready(struct dc_link *link, bool ready) { diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c index 878f47b59d5a..daaff7319413 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c @@ -55,6 +55,9 @@ void dp_receiver_power_ctrl(struct dc_link *link, bool on) state = on ? DP_POWER_STATE_D0 : DP_POWER_STATE_D3; + if (link->sync_lt_in_progress) + return; + core_link_write_dpcd(link, DP_SET_POWER, &state, sizeof(state)); } @@ -245,46 +248,6 @@ void dp_set_hw_lane_settings( encoder->funcs->dp_set_lane_settings(encoder, link_settings); } -enum dp_panel_mode dp_get_panel_mode(struct dc_link *link) -{ - /* We need to explicitly check that connector - * is not DP. Some Travis_VGA get reported - * by video bios as DP. - */ - if (link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT) { - - switch (link->dpcd_caps.branch_dev_id) { - case DP_BRANCH_DEVICE_ID_2: - if (strncmp( - link->dpcd_caps.branch_dev_name, - DP_VGA_LVDS_CONVERTER_ID_2, - sizeof( - link->dpcd_caps. - branch_dev_name)) == 0) { - return DP_PANEL_MODE_SPECIAL; - } - break; - case DP_BRANCH_DEVICE_ID_3: - if (strncmp(link->dpcd_caps.branch_dev_name, - DP_VGA_LVDS_CONVERTER_ID_3, - sizeof( - link->dpcd_caps. - branch_dev_name)) == 0) { - return DP_PANEL_MODE_SPECIAL; - } - break; - default: - break; - } - } - - if (link->dpcd_caps.panel_mode_edp) { - return DP_PANEL_MODE_EDP; - } - - return DP_PANEL_MODE_DEFAULT; -} - void dp_set_hw_test_pattern( struct dc_link *link, enum dp_test_pattern test_pattern, 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 efa7a47f6b7e..ef79a686e4c2 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -128,7 +128,10 @@ struct dc_link_training_overrides { enum dc_link_spread *downspread; bool *alternate_scrambler_reset; bool *enhanced_framing; + bool *mst_enable; +#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT bool *fec_enable; +#endif }; union dpcd_rev { diff --git a/drivers/gpu/drm/amd/display/dc/dc_link.h b/drivers/gpu/drm/amd/display/dc/dc_link.h index d6ff5af70c71..9ea75db3484e 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_link.h +++ b/drivers/gpu/drm/amd/display/dc/dc_link.h @@ -84,6 +84,7 @@ struct dc_link { bool dp_ss_off; bool link_state_valid; bool aux_access_disabled; + bool sync_lt_in_progress; /* caps is the same as reported_link_cap. link_traing use * reported_link_cap. Will clean up. TODO @@ -228,6 +229,15 @@ enum link_training_result dc_link_dp_perform_link_training( const struct dc_link_settings *link_setting, bool skip_video_pattern); +bool dc_link_dp_sync_lt_begin(struct dc_link *link); + +enum link_training_result dc_link_dp_sync_lt_attempt( + struct dc_link *link, + struct dc_link_settings *link_setting, + struct dc_link_training_overrides *lt_settings); + +bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down); + void dc_link_dp_enable_hpd(const struct dc_link *link); void dc_link_dp_disable_hpd(const struct dc_link *link); diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h index c5293f9508fa..2ef23963e1f7 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h +++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h @@ -62,6 +62,9 @@ bool is_dp_active_dongle(const struct dc_link *link); void dp_enable_mst_on_sink(struct dc_link *link, bool enable); +enum dp_panel_mode dp_get_panel_mode(struct dc_link *link); +void dp_set_panel_mode(struct dc_link *link, enum dp_panel_mode panel_mode); + #ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT void dp_set_fec_ready(struct dc_link *link, bool ready); void dp_set_fec_enable(struct dc_link *link, bool enable); diff --git a/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h b/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h index 3680846674e8..4eff5d38a2f9 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h +++ b/drivers/gpu/drm/amd/display/dc/inc/link_hwss.h @@ -72,8 +72,6 @@ void dp_set_hw_test_pattern( uint8_t *custom_pattern, uint32_t custom_pattern_size); -enum dp_panel_mode dp_get_panel_mode(struct dc_link *link); - void dp_retrain_link_dp_test(struct dc_link *link, struct dc_link_settings *link_setting, bool skip_video_pattern); |