From 8ccf0e20769d96b8d0ccbfcb56bc7ca7874154a4 Mon Sep 17 00:00:00 2001 From: Wenjing Liu Date: Sun, 5 Apr 2020 16:41:13 -0400 Subject: drm/amd/display: determine USB C DP2 mode only when USB DP Alt is enabled [why] When display is connected with a native DP port, DP2 mode register value is a don't care. Driver mistakenly reduce max supported lane count to 2 lane based on the don't care value. [how] Add additional check only if USB C DP alt mode is enabled, we will determine max lane count supported based on current mode. Signed-off-by: Wenjing Liu Reviewed-by: Aric Cyr Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/gpu/drm/amd/display/dc/virtual') diff --git a/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c b/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c index 3464b2d5b89a..348e9a600a72 100644 --- a/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c @@ -84,6 +84,14 @@ static void virtual_link_encoder_destroy(struct link_encoder **enc) *enc = NULL; } +static void virtual_link_encoder_get_max_link_cap(struct link_encoder *enc, + struct dc_link_settings *link_settings) +{ + /* Set Default link settings */ + struct dc_link_settings max_link_cap = {LANE_COUNT_FOUR, LINK_RATE_HIGH, + LINK_SPREAD_05_DOWNSPREAD_30KHZ, false, 0}; + *link_settings = max_link_cap; +} static const struct link_encoder_funcs virtual_lnk_enc_funcs = { .validate_output_with_stream = @@ -94,6 +102,7 @@ static const struct link_encoder_funcs virtual_lnk_enc_funcs = { .enable_dp_output = virtual_link_encoder_enable_dp_output, .enable_dp_mst_output = virtual_link_encoder_enable_dp_mst_output, .disable_output = virtual_link_encoder_disable_output, + .get_max_link_cap = virtual_link_encoder_get_max_link_cap, .dp_set_lane_settings = virtual_link_encoder_dp_set_lane_settings, .dp_set_phy_pattern = virtual_link_encoder_dp_set_phy_pattern, .update_mst_stream_allocation_table = -- cgit v1.2.3