diff options
| author | Tianci.Yin <tianci.yin@amd.com> | 2022-03-08 13:45:45 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2022-03-15 14:25:16 -0400 |
| commit | 2e9fda82c98b1e417b90ff5a2f8b8b96cac06fc5 (patch) | |
| tree | f3f78f18ac9a45727676709ce369efe7bdd38c0c /drivers/gpu/drm/amd | |
| parent | 8718ca1dbf497c302df989afaeb82f05f5a3d961 (diff) | |
drm/amd/display: fix dp kvm can't light up
[why]
The DP KVM failed to light up, since the lttpr_mode is not reset to
default value when failed to read LTTPR capabilities, and the
variable max_link_rate retains a initial value zero, this cause variable
link_rate be assigned to an error value zero, consquently pixel_clock
get wrong value zero, and kvm can't light up.
[how]
Reset lttpr_mode to default value when failed to read LTTPR
capabilities, so that the link_rate fallbacks to the minimum rate that
supported by link encoder and sink.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Tianci.Yin <tianci.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 1 |
1 files changed, 1 insertions, 0 deletions
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 7d88165e8fa2..c35d55fe41ab 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 @@ -5110,6 +5110,7 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link) sizeof(lttpr_dpcd_data)); if (status != DC_OK) { DC_LOG_DP2("%s: Read LTTPR caps data failed.\n", __func__); + link->lttpr_mode = LTTPR_MODE_NON_LTTPR; return false; } |