[PATCH v3 2/6] drm/msm/dp: reduce link rate if failed at link training 1

[Stephen Boyd]

Quoting Kuogee Hsieh (2021-08-05 13:44:51)
> 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 at codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd at chromium.org>