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[0/3] drm/bridge: it6505: fix DP link traning and improve compatibility

Message ID 20250124-fix-link-training-v1-0-09511050bb2c@ite.com.tw (mailing list archive)
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Series drm/bridge: it6505: fix DP link traning and improve compatibility | expand

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Hermes Wu via B4 Relay Jan. 24, 2025, 2:29 a.m. UTC 
IT6505 supports HW auto link training which will write DPCD and check
training status automatically. Some DP device can not pass 
HW auto link training and must set link training step by step.

when HW auto link training fail, it may trigger video FIFO error,
and link training process will reset to beginning, and never try
step training method.  

Modify training method improve compatibility to these DP devices.

Signed-off-by: Hermes Wu <Hermes.wu@ite.com.tw>
---
Hermes Wu (3):
      drm/bridge: it6505: modify DP link auto training
      drm/bridge: it6505: modify DP link training work
      drm/bridge: it6505: skip auto training when previous try fail

 drivers/gpu/drm/bridge/ite-it6505.c | 106 ++++++++++++++++++++++--------------
 1 file changed, 66 insertions(+), 40 deletions(-)
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base-commit: 938fbb16aba8f7b88e0fdcf56f315a5bbad41aad
change-id: 20250121-fix-link-training-461495494655

Best regards,