linux-kernel - Re: [PATCH v4 04/23] phy: qcom-qmp-ufs: Add support for configuring PHY in HS Series B mode

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Message-ID: <20221206071213.GA15486@thinkpad>
Date:   Tue, 6 Dec 2022 12:42:13 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     martin.petersen@...cle.com, jejb@...ux.ibm.com,
        andersson@...nel.org, vkoul@...nel.org, quic_cang@...cinc.com,
        quic_asutoshd@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-scsi@...r.kernel.org, ahalaney@...hat.com,
        abel.vesa@...aro.org, alim.akhtar@...sung.com, avri.altman@....com,
        bvanassche@....org
Subject: Re: [PATCH v4 04/23] phy: qcom-qmp-ufs: Add support for configuring
 PHY in HS Series B mode

On Tue, Dec 06, 2022 at 12:51:42AM +0300, Dmitry Baryshkov wrote:
> 
> 
> On 1 December 2022 20:43:09 GMT+03:00, Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org> wrote:
> >Add separate tables_hs_b instance to allow the PHY driver to configure the
> >PHY in HS Series B mode. The individual SoC configs need to supply the
> >serdes register setting in tables_hs_b and the UFS driver can request the
> >Series B mode by calling phy_set_mode() with mode set to PHY_MODE_UFS_HS_B.
> >
> >Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> >---
> > drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 15 +++++++++++++++
> > 1 file changed, 15 insertions(+)
> >
> >diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >index 516027e356f0..2d5dd336aeb2 100644
> >--- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >+++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> >@@ -547,6 +547,8 @@ struct qmp_phy_cfg {
> > 
> > 	/* Main init sequence for PHY blocks - serdes, tx, rx, pcs */
> > 	const struct qmp_phy_cfg_tbls tbls;
> >+	/* Additional sequence for HS Series B */
> >+	const struct qmp_phy_cfg_tbls tbls_hs_b;
> > 
> > 	/* clock ids to be requested */
> > 	const char * const *clk_list;
> >@@ -580,6 +582,7 @@ struct qmp_ufs {
> > 	struct reset_control *ufs_reset;
> > 
> > 	struct phy *phy;
> >+	u32 mode;
> > };
> > 
> > static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
> >@@ -841,6 +844,8 @@ static void qmp_ufs_pcs_init(struct qmp_ufs *qmp, const struct qmp_phy_cfg_tbls
> > static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg *cfg)
> > {
> > 	qmp_ufs_serdes_init(qmp, &cfg->tbls);
> >+	if (qmp->mode == PHY_MODE_UFS_HS_B)
> >+		qmp_ufs_serdes_init(qmp, &cfg->tbls_hs_b);
> 
> I still think that qmp_ufs_init_registers() is a way to go here , see the pcie driver.
> 

I did use qmp_ufs_init_registers() as a wrapper. Only difference here is that
there is one more level of abstraction which looks cleaner to me.

Thanks,
Mani

> > 	qmp_ufs_lanes_init(qmp, &cfg->tbls);
> > 	qmp_ufs_pcs_init(qmp, &cfg->tbls);
> > }
> >@@ -1011,9 +1016,19 @@ static int qmp_ufs_disable(struct phy *phy)
> > 	return qmp_ufs_exit(phy);
> > }
> > 
> >+static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode)
> >+{
> >+	struct qmp_ufs *qmp = phy_get_drvdata(phy);
> >+
> >+	qmp->mode = mode;
> >+
> >+	return 0;
> >+}
> >+
> > static const struct phy_ops qcom_qmp_ufs_phy_ops = {
> > 	.power_on	= qmp_ufs_enable,
> > 	.power_off	= qmp_ufs_disable,
> >+	.set_mode	= qmp_ufs_set_mode,
> > 	.owner		= THIS_MODULE,
> > };
> > 
> 
> -- 
> With best wishes
> Dmitry

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