linux-kernel - Re: [PATCH 03/15] phy: qcom-qmp-ufs: Add support for configuring PHY in HS G4 mode

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Date:   Sun, 30 Oct 2022 00:54:38 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        martin.petersen@...cle.com, jejb@...ux.ibm.com,
        andersson@...nel.org, vkoul@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     konrad.dybcio@...ainline.org, robh+dt@...nel.org,
        quic_cang@...cinc.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 03/15] phy: qcom-qmp-ufs: Add support for configuring PHY
 in HS G4 mode

On 29/10/2022 17:16, Manivannan Sadhasivam wrote:
> Add separate tables_hs_g4 instance to allow the PHY driver to configure the
> PHY in HS G4 mode. The individual SoC configs need to supply the Rx, Tx and
> PCS register setting in tables_hs_g4 and the UFS driver can request the
> Hs G4 mode by calling phy_set_mode_ext() with submode set to UFS_HS_G4.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

(Especially if changed to qmp_ufs_init_registers()).

> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> index 4c6a2b5afc9a..5f2a012707b7 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c
> @@ -553,6 +553,8 @@ struct qmp_phy_cfg {
>   	const struct qmp_phy_cfg_tables tables;
>   	/* Additional sequence for HS Series B */
>   	const struct qmp_phy_cfg_tables tables_hs_b;
> +	/* Additional sequence for HS G4 */
> +	const struct qmp_phy_cfg_tables tables_hs_g4;
>   
>   	/* clock ids to be requested */
>   	const char * const *clk_list;
> @@ -587,6 +589,7 @@ struct qmp_phy_cfg {
>    * @pcs_misc: iomapped memory space for lane's pcs_misc
>    * @qmp: QMP phy to which this lane belongs
>    * @mode: PHY mode configured by the UFS driver
> + * @submode: PHY submode configured by the UFS driver
>    */
>   struct qmp_phy {
>   	struct phy *phy;
> @@ -600,6 +603,7 @@ struct qmp_phy {
>   	void __iomem *pcs_misc;
>   	struct qcom_qmp *qmp;
>   	u32 mode;
> +	u32 submode;
>   };
>   
>   /**
> @@ -993,8 +997,12 @@ static int qmp_ufs_power_on(struct phy *phy)
>   		qmp_ufs_serdes_init(qphy, &cfg->tables_hs_b);
>   
>   	qmp_ufs_lanes_init(qphy, &cfg->tables);
> +	if (qphy->submode == UFS_HS_G4)
> +		qmp_ufs_lanes_init(qphy, &cfg->tables_hs_g4);
>   
>   	qmp_ufs_pcs_init(qphy, &cfg->tables);
> +	if (qphy->submode == UFS_HS_G4)
> +		qmp_ufs_pcs_init(qphy, &cfg->tables_hs_g4);
>   
>   	ret = reset_control_deassert(qmp->ufs_reset);
>   	if (ret)
> @@ -1083,6 +1091,7 @@ static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode)
>   	struct qmp_phy *qphy = phy_get_drvdata(phy);
>   
>   	qphy->mode = mode;
> +	qphy->submode = submode;
>   
>   	return 0;
>   }

-- 
With best wishes
Dmitry