From c798836bb7b60afda892173dddda466752f321c7 Mon Sep 17 00:00:00 2001 From: Jack Chang Date: Wed, 20 Aug 2025 16:59:08 +0800 Subject: [PATCH] drm/amd/display: Get panel replay capability from DPCD [Why&How] Read Panel replay caps from DPCD when retrieving link capability Reviewed-by: Robin Chen Signed-off-by: Jack Chang Signed-off-by: Leon Huang Signed-off-by: Ivan Lipski Tested-by: Dan Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 11 +++++++++++ .../display/dc/link/protocols/link_dp_capability.c | 5 +++++ 2 files changed, 16 insertions(+) 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 17bcff25a2626..79e1696def630 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -1157,6 +1157,16 @@ struct dprx_states { bool cable_id_written; }; +union dpcd_panel_replay_capability_supported { + struct { + unsigned char PANEL_REPLAY_SUPPORT :1; + unsigned char SELECTIVE_UPDATE_SUPPORT :1; + unsigned char EARLY_TRANSPORT_SUPPORT :1; + unsigned char RESERVED :5; + } bits; + unsigned char raw; +}; + enum dpcd_downstream_port_max_bpc { DOWN_STREAM_MAX_8BPC = 0, DOWN_STREAM_MAX_10BPC, @@ -1280,6 +1290,7 @@ struct dpcd_caps { struct edp_psr_info psr_info; struct replay_info pr_info; + union dpcd_panel_replay_capability_supported pr_caps_supported; uint16_t edp_oled_emission_rate; union dp_receive_port0_cap receive_port0_cap; /* Indicates the number of SST links supported by MSO (Multi-Stream Output) */ diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c index 750147c52c8af..168c59bf1f169 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_capability.c @@ -2091,6 +2091,11 @@ static bool retrieve_link_cap(struct dc_link *link) link->dpcd_caps.max_uncompressed_pixel_rate_cap.raw, sizeof(link->dpcd_caps.max_uncompressed_pixel_rate_cap.raw)); + core_link_read_dpcd(link, + DP_PANEL_REPLAY_CAPABILITY_SUPPORT, + &link->dpcd_caps.pr_caps_supported.raw, + sizeof(link->dpcd_caps.pr_caps_supported.raw)); + /* Read DP tunneling information. */ status = dpcd_get_tunneling_device_data(link); if (status != DC_OK) -- 2.47.3