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 3b1e38e110ee..e449839c2c34 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -514,6 +514,40 @@ static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *lin } +static void read_edp_current_link_settings_on_detect(struct dc_link *link) +{ + union lane_count_set lane_count_set = { {0} }; + uint8_t link_bw_set; + uint8_t link_rate_set; + + // Read DPCD 00101h to find out the number of lanes currently set + core_link_read_dpcd(link, DP_LANE_COUNT_SET, + &lane_count_set.raw, sizeof(lane_count_set)); + link->cur_link_settings.lane_count = lane_count_set.bits.LANE_COUNT_SET; + + // Read DPCD 00100h to find if standard link rates are set + core_link_read_dpcd(link, DP_LINK_BW_SET, + &link_bw_set, sizeof(link_bw_set)); + + if (link_bw_set == 0) { + /* If standard link rates are not being used, + * Read DPCD 00115h to find the link rate set used + */ + core_link_read_dpcd(link, DP_LINK_RATE_SET, + &link_rate_set, sizeof(link_rate_set)); + + if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) { + link->cur_link_settings.link_rate = + link->dpcd_caps.edp_supported_link_rates[link_rate_set]; + link->cur_link_settings.link_rate_set = link_rate_set; + link->cur_link_settings.use_link_rate_set = true; + } + } else { + link->cur_link_settings.link_rate = link_bw_set; + link->cur_link_settings.use_link_rate_set = false; + } +} + static bool detect_dp( struct dc_link *link, struct display_sink_capability *sink_caps, @@ -648,9 +682,14 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) return false; } - if (link->connector_signal == SIGNAL_TYPE_EDP && - link->local_sink) - return true; + if (link->connector_signal == SIGNAL_TYPE_EDP) { + /* On detect, we want to make sure current link settings are + * up to date, especially if link was powered on by GOP. + */ + read_edp_current_link_settings_on_detect(link); + if (link->local_sink) + return true; + } if (link->connector_signal == SIGNAL_TYPE_LVDS && link->local_sink) @@ -1396,13 +1435,19 @@ static enum dc_status enable_link_dp( /* get link settings for video mode timing */ decide_link_settings(stream, &link_settings); - /* If link settings are different than current and link already enabled - * then need to disable before programming to new rate. - */ - if (link->link_status.link_active && - (link->cur_link_settings.lane_count != link_settings.lane_count || - link->cur_link_settings.link_rate != link_settings.link_rate)) { - dp_disable_link_phy(link, pipe_ctx->stream->signal); + if (pipe_ctx->stream->signal == SIGNAL_TYPE_EDP) { + /* If link settings are different than current and link already enabled + * then need to disable before programming to new rate. + */ + if (link->link_status.link_active && + (link->cur_link_settings.lane_count != link_settings.lane_count || + link->cur_link_settings.link_rate != link_settings.link_rate)) { + dp_disable_link_phy(link, pipe_ctx->stream->signal); + } + + /*in case it is not on*/ + link->dc->hwss.edp_power_control(link, true); + link->dc->hwss.edp_wait_for_hpd_ready(link, true); } pipe_ctx->stream_res.pix_clk_params.requested_sym_clk = @@ -1448,15 +1493,9 @@ static enum dc_status enable_link_edp( struct pipe_ctx *pipe_ctx) { enum dc_status status; - struct dc_stream_state *stream = pipe_ctx->stream; - struct dc_link *link = stream->link; - /*in case it is not on*/ - link->dc->hwss.edp_power_control(link, true); - link->dc->hwss.edp_wait_for_hpd_ready(link, true); status = enable_link_dp(state, pipe_ctx); - return status; } 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 a6424c70f4c5..64a309a5e1c9 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 @@ -2586,9 +2586,6 @@ void detect_edp_sink_caps(struct dc_link *link) uint32_t entry; uint32_t link_rate_in_khz; enum dc_link_rate link_rate = LINK_RATE_UNKNOWN; - union lane_count_set lane_count_set = { {0} }; - uint8_t link_bw_set; - uint8_t link_rate_set; retrieve_link_cap(link); link->dpcd_caps.edp_supported_link_rates_count = 0; @@ -2614,33 +2611,6 @@ void detect_edp_sink_caps(struct dc_link *link) } } link->verified_link_cap = link->reported_link_cap; - - // Read DPCD 00101h to find out the number of lanes currently set - core_link_read_dpcd(link, DP_LANE_COUNT_SET, - &lane_count_set.raw, sizeof(lane_count_set)); - link->cur_link_settings.lane_count = lane_count_set.bits.LANE_COUNT_SET; - - // Read DPCD 00100h to find if standard link rates are set - core_link_read_dpcd(link, DP_LINK_BW_SET, - &link_bw_set, sizeof(link_bw_set)); - - if (link_bw_set == 0) { - /* If standard link rates are not being used, - * Read DPCD 00115h to find the link rate set used - */ - core_link_read_dpcd(link, DP_LINK_RATE_SET, - &link_rate_set, sizeof(link_rate_set)); - - if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) { - link->cur_link_settings.link_rate = - link->dpcd_caps.edp_supported_link_rates[link_rate_set]; - link->cur_link_settings.link_rate_set = link_rate_set; - link->cur_link_settings.use_link_rate_set = true; - } - } else { - link->cur_link_settings.link_rate = link_bw_set; - link->cur_link_settings.use_link_rate_set = false; - } } void dc_link_dp_enable_hpd(const struct dc_link *link)