linux-kernel - Re: [PATCH 17/22] phy: qcom-qmp-combo: merge USB and DP configurations

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Message-ID: <Y3ICOwr2ld9cdgrK@hovoldconsulting.com>
Date:   Mon, 14 Nov 2022 09:54:19 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/22] phy: qcom-qmp-combo: merge USB and DP
 configurations

On Sat, Nov 12, 2022 at 10:43:14AM +0300, Dmitry Baryshkov wrote:
> On 11/11/2022 11:56, Johan Hovold wrote:
> > It does not really make any sense to keep separate configuration
> > structures for the USB and DP parts of the same PHY so merge them.
> > 
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 182 +++++++---------------
> >   1 file changed, 57 insertions(+), 125 deletions(-)
> > 
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > index b27d1821116c..249912b75964 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> > @@ -798,10 +798,7 @@ static const u8 qmp_dp_v5_voltage_swing_hbr_rbr[4][4] = {
> >   
> >   struct qmp_phy;
> >   
> > -/* struct qmp_phy_cfg - per-PHY initialization config */
> >   struct qmp_phy_cfg {
> > -	/* phy-type - PCIE/UFS/USB */
> > -	unsigned int type;
> >   	int lanes;
> 
> int lanes doesn't really make sense here in my opinion. It should be 
> usb_lanes and dp_lanes.

It doesn't make much less sense than having it here currently do.

All of these USB-C PHYs are dual lane for bi-directional SS USB and
quad lane for uni-directional DP (even if only CC1 orientation and lanes
2 and 3 are currently supported).

I should probably just drop the lanes parameter completely, either as a
preparatory clean up or as follow-on one (e.g. also a bit depending on
if there are other reasons for respinning a v2).

Johan