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| author |   Wenjing Liu <wenjing.liu@amd.com> | 2020-04-05 16:41:13 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2020-04-09 10:43:17 -0400 |
| commit | 8ccf0e20769d96b8d0ccbfcb56bc7ca7874154a4 (patch) | |
| tree | e7e1ba1085e53420574114149841c530b98910c3 /drivers/gpu/drm/amd/display/dc/virtual | |
| parent | drm/amd/display: Check for null fclk voltage when parsing clock table (diff) | |
| download | linux-dev-8ccf0e20769d96b8d0ccbfcb56bc7ca7874154a4.tar.xz linux-dev-8ccf0e20769d96b8d0ccbfcb56bc7ca7874154a4.zip | |
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 <wenjing.liu@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/virtual')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/virtual/virtual_link_encoder.c | 9 |
1 files changed, 9 insertions, 0 deletions
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 = |