Re: [PATCH v4] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing

Quoting Kuogee Hsieh (2021-09-14 09:45:01)

Both voltage and pre-emphasis swing level are set during link training
negotiation between host and sink. There are totally four tables added.
A voltage swing table for both hbr and hbr1, a voltage table for both
hbr2 and hbr3, a pre-emphasis table for both hbr and hbr1 and a pre-emphasis
table for both hbr2 and hbr3. In addition, write 0x0a to TX_TX_POL_INV is
added to complete the sequence of configure dp phy base on HPG.

Chnages in v2:
-- revise commit test
-- add Fixes tag
-- replaced voltage_swing_cfg with voltage
-- replaced pre_emphasis_cfg with emphasis
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_v4_phy_configure_dp_swing()
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_phy_configure_dp_swing()

Changes in V3:
-- add __qcom_qmp_phy_configure_dp_swing() to commit swing/pre-emphasis level

Changes in V4:
-- pass 2D array to __qcom_qmp_phy_configure_dp_swing()

Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp phy")
Signed-off-by: Kuogee Hsieh <redacted>
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Reviewed-by: Stephen Boyd <redacted>