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Atm, the driver programs explicitly the default transparent link training mode (0x55) to DP_PHY_REPEATER_MODE even if no LTTPRs are detected. This conforms to the spec (3.6.6.1): "DP upstream devices that do not enable the Non-transparent mode of LTTPRs shall program the PHY_REPEATER_MODE register (DPCD Address F0003h) to 55h (default) prior to link training" however writing the default value to this DPCD register seems to cause occasional link training errors at least for a DELL WD19TB TBT dock, when no LTTPRs are detected. Writing to DP_PHY_REPEATER_MODE will also cause an unnecessary timeout on systems without any LTTPR. To fix the above two issues let's assume that setting the default mode is redundant when no LTTPRs are detected. Keep the existing behavior and program the default mode if more than 8 LTTPRs are detected or in case the read from DP_PHY_REPEATER_CNT returns an invalid value. References: https://gitlab.freedesktop.org/drm/intel/-/issues/2801 Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Khaled Almahallawy <khaled.almahallawy@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210118183143.1145707-1-imre.deak@intel.com |
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