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...s. According to the DisplayPort standard, LTTPRs have two operating modes: - non-transparent - it replies to DPCD LTTPR field specific AUX requests, while passes through all other AUX requests - transparent - it passes through all AUX requests. Switching between this two modes is done by the DPTX by issuing an AUX write to the DPCD PHY_REPEATER_MODE register. The msm DP driver is currently lacking any handling of LTTPRs. This means that if at least one LTTPR is found between DPTX and DPRX, the link training would fail if that LTTPR was not already configured in transparent mode. The secti...

Looking at both i915 and nouveau DP drivers, both are setting the first LTTPR (if found) in transparent mode first and then in non-transparent mode, just like the DP v2.0 specification mentions in section 3.6.6.1. Being part of the standard, setting the LTTPR in a specific operation mode can be easily moved in the generic framework. So do that by adding a new helper. Then, the msm DP driver is

Looking at both i915 and nouveau DP drivers, both are setting the first LTTPR (if found) in transparent mode first and then in non-transparent mode, just like the DP v2.0 specification mentions in section 3.6.6.1. Being part of the standard, setting the LTTPR in a specific operation mode can be easily moved in the generic framework. So do that by adding a new helper. Then, the msm DP driver is

...rt standard, LTTPRs have two operating > modes: > - non-transparent - it replies to DPCD LTTPR field specific AUX > requests, while passes through all other AUX requests > - transparent - it passes through all AUX requests. > > Switching between this two modes is done by the DPTX by issuing > an AUX write to the DPCD PHY_REPEATER_MODE register. > > Add a generic helper that allows switching between these modes. > > Also add a generic wrapper for the helper that handles the explicit > disabling of non-transparent mode and its disable->enable sequence &...

According to the DisplayPort standard, LTTPRs have two operating modes: - non-transparent - it replies to DPCD LTTPR field specific AUX requests, while passes through all other AUX requests - transparent - it passes through all AUX requests. Switching between this two modes is done by the DPTX by issuing an AUX write to the DPCD PHY_REPEATER_MODE register. Add a generic helper that allows switching between these modes. Also add a generic wrapper for the helper that handles the explicit disabling of non-transparent mode and its disable->enable sequence mentioned in the DP Standard v2...