linux-kernel - Re: [PATCH v2] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing

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Date:   Fri, 3 Sep 2021 15:16:27 -0400
From:   Stephen Boyd <swboyd@...omium.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kuogee Hsieh <khsieh@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        robdclark@...il.com, robh+dt@...nel.org, sean@...rly.run,
        vkoul@...nel.org
Cc:     abhinavk@...eaurora.org, aravindh@...eaurora.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kishon@...com, p.zabel@...gutronix.de
Subject: Re: [PATCH v2] phy: qcom-qmp: add support for display port voltage
 and pre-emphasis swing

Quoting Dmitry Baryshkov (2021-09-03 12:09:14)
> On 28/08/2021 00:10, Kuogee Hsieh wrote:
> > 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()
> >
> > Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp phy")
> > Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> > ---
> >   drivers/phy/qualcomm/phy-qcom-qmp.c | 117 ++++++++++++++++++++++++++----------
> >   1 file changed, 85 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > index 31036aa..021cbb0 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> > @@ -3546,12 +3546,11 @@ static const u8 qmp_dp_v3_voltage_swing_hbr_rbr[4][4] = {
> >       { 0x1f, 0xff, 0xff, 0xff }
> >   };
> >
> > -static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
> > -             unsigned int drv_lvl_reg, unsigned int emp_post_reg)
> > +static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy)
>
> As this becomes a v3-only function, could you please rename it to
> qcom_qmp_v3_phy_configure_dp_swing()

Can it be combined with the v4 version instead? The code structure is
essentially the same, modulo the tables used and the register offset
written to.