drm/msm/dp: reduce link rate if failed at link training 1

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Reduce link rate and re start link training if link training 1
failed due to loss of clock recovery done to fix Link Layer
CTS case 4.3.1.7.  Also only update voltage and pre-emphasis
swing level after link training started to fix Link Layer CTS
case 4.3.1.6.

Changes in V2:
-- replaced cr_status with link_status[DP_LINK_STATUS_SIZE]
-- replaced dp_ctrl_any_lane_cr_done() with dp_ctrl_colco_recovery_any_ok()
-- replaced dp_ctrl_any_ane_cr_lose() with !drm_dp_clock_recovery_ok()

Changes in V3:
-- return failed if lane_count <= 1

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1628196295-7382-3-git-send-email-khsieh@codeaurora.org
[remove unused cr_status variable]
Signed-off-by: Rob Clark <robdclark@chromium.org>

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Kuogee Hsieh 2021-08-05 13:44:51 -07:00 • committed by Rob Clark

parent 52352fe2f8

commit 4b85d405cf

1 changed files with 44 additions and 34 deletions

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drivers/gpu/drm/msm/dp/dp_ctrl.c

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