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drm/amd/display: fix MST link training fail division by 0 

When link training fail in MST case, we will divide by 0
when calculating avg_time_slots_per_mtp, so we cannot
proceed.

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang 2017-11-01 15:43:47 -04:00 committed by Alex Deucher
parent 82e9781053
commit 00f713c6dc
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -2318,9 +2318,11 @@ void core_link_enable_stream(
/* Abort stream enable *unless* the failure was due to
* DP link training - some DP monitors will recover and
* show the stream anyway.
* show the stream anyway. But MST displays can't proceed
* without link training.
*/
if (status != DC_FAIL_DP_LINK_TRAINING) {
if (status != DC_FAIL_DP_LINK_TRAINING ||
pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
BREAK_TO_DEBUGGER();
return;
}