linux-kernel - Re: [RFC PATCH v2 2/3] phy: qcom-qmp-combo: Add config for SM6350

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Date:   Fri, 25 Nov 2022 11:14:53 +0100
From:   "Luca Weiss" <luca.weiss@...rphone.com>
To:     "Johan Hovold" <johan@...nel.org>
Cc:     <linux-arm-msm@...r.kernel.org>,
        <~postmarketos/upstreaming@...ts.sr.ht>,
        <phone-devel@...r.kernel.org>, "Andy Gross" <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        "Konrad Dybcio" <konrad.dybcio@...aro.org>,
        "Vinod Koul" <vkoul@...nel.org>,
        "Kishon Vijay Abraham I" <kishon@...nel.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 2/3] phy: qcom-qmp-combo: Add config for SM6350

Hi Johan,

On Fri Nov 25, 2022 at 11:01 AM CET, Johan Hovold wrote:
> On Fri, Nov 25, 2022 at 10:27:48AM +0100, Luca Weiss wrote:
> > Add the tables and config for the combo phy found on SM6350.
> > 
> > Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> > ---
> > @Johan Hovold, here I've added dp_txa & dp_txb, I believe otherwise
> > qmp->dp_tx would be wrong. Is this different on sc8280xp or was this a
> > mistake on your side? I think this should probably be split out to
> > another patch to not mix things up too much.
>
> Yeah, that's a difference in sc8280xp which does not have dedicated TX
> registers for DP.

Good to know.

>
> This is probably best handled explicitly when parsing the DT by using
> dp_txa/b if they are set and otherwise fallback to txa/txb (e.g.
> instead of hiding it in the v5 table by using the same offset in two
> places).

Are you thinking about something like this?

if (offs->dp_txa)
    qmp->dp_tx = base + offs->dp_txa
else
    qmp->dp_tx = base + offs->txa;

if (offs->dp_txb)
    qmp->dp_tx2 = base + offs->dp_txb;
else
    qmp->dp_tx2 = base + offs->txb;

This wouldn't handle ".dp_txa = 0x0000" but I don't think this should be
a problem, right?

>
> It can be done as part of this patch as long as you mention it in the
> commit message.

Ack.

Regards
Luca

>
> > I think other than that this patch is good.
>
> Indeed, looks good! Nice to see this working out as intended also for
> the older platforms.
>
> >  static const struct qmp_phy_init_tbl sm8150_usb3_serdes_tbl[] = {
> >  	QMP_PHY_INIT_CFG(QSERDES_V4_COM_SSC_EN_CENTER, 0x01),
> >  	QMP_PHY_INIT_CFG(QSERDES_V4_COM_SSC_PER1, 0x31),
> > @@ -809,6 +873,8 @@ struct qmp_combo_offsets {
> >  	u16 usb3_pcs;
> >  	u16 usb3_pcs_usb;
> >  	u16 dp_serdes;
> > +	u16 dp_txa;
> > +	u16 dp_txb;
> >  	u16 dp_dp_phy;
> >  };
> >  
> > @@ -975,6 +1041,21 @@ static const char * const sc7180_usb3phy_reset_l[] = {
> >  	"phy",
> >  };
> >  
> > +static const struct qmp_combo_offsets qmp_combo_offsets_v3 = {
> > +	.com		= 0x0000,
> > +	.txa		= 0x1200,
> > +	.rxa		= 0x1400,
> > +	.txb		= 0x1600,
> > +	.rxb		= 0x1800,
> > +	.usb3_serdes	= 0x1000,
> > +	.usb3_pcs_misc	= 0x1a00,
> > +	.usb3_pcs	= 0x1c00,
> > +	.dp_serdes	= 0x2000,
> > +	.dp_txa		= 0x2200,
> > +	.dp_txb		= 0x2600,
> > +	.dp_dp_phy	= 0x2c00,
> > +};
> > +
> >  static const struct qmp_combo_offsets qmp_combo_offsets_v5 = {
> >  	.com		= 0x0000,
> >  	.txa		= 0x0400,
>
> > @@ -2641,8 +2767,8 @@ static int qmp_combo_parse_dt(struct qmp_combo *qmp)
> >  	qmp->pcs_usb = base + offs->usb3_pcs_usb;
> >  
> >  	qmp->dp_serdes = base + offs->dp_serdes;
> > -	qmp->dp_tx = base + offs->txa;
> > -	qmp->dp_tx2 = base + offs->txb;
> > +	qmp->dp_tx = base + offs->dp_txa;
> > +	qmp->dp_tx2 = base + offs->dp_txb;
> >  	qmp->dp_dp_phy = base + offs->dp_dp_phy;
> >  
> >  	qmp->pipe_clk = devm_clk_get(dev, "usb3_pipe");
>
> Johan