linux-kernel - Re: [PATCH v4 4/4] phy: qcom-qmp: Use proper PWRDOWN offset for sm8150 USB

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Message-ID: <d61723e3-17a3-366d-f476-c33931766efd@codeaurora.org>
Date:   Thu, 2 Apr 2020 13:05:32 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     Wesley Cheng <wcheng@...eaurora.org>, agross@...nel.org,
        bjorn.andersson@...aro.org, kishon@...com, robh+dt@...nel.org,
        mark.rutland@....com, p.zabel@...gutronix.de
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 4/4] phy: qcom-qmp: Use proper PWRDOWN offset for
 sm8150 USB


On 3/31/2020 1:06 AM, Wesley Cheng wrote:
> The register map for SM8150 QMP USB SSPHY has moved
> QPHY_POWER_DOWN_CONTROL to a different offset.  Allow for
> an offset in the register table to override default value
> if it is a DP capable PHY.
>
> Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index cc04471..4c0517e 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -164,6 +164,7 @@ enum qphy_reg_layout {
>  	[QPHY_SW_RESET]			= 0x00,
>  	[QPHY_START_CTRL]		= 0x44,
>  	[QPHY_PCS_STATUS]		= 0x14,
> +	[QPHY_COM_POWER_DOWN_CONTROL]	= 0x40,
Since this is in PCS block please rename it to -

QPHY_PCS_POWER_DOWN_CONTROL

>  };
>  
>  static const unsigned int sdm845_ufsphy_regs_layout[] = {
> @@ -1627,6 +1628,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy)
>  	if (cfg->has_phy_com_ctrl)
>  		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
>  			     SW_PWRDN);
> +	else if (cfg->has_phy_dp_com_ctrl && cfg->regs[QPHY_COM_POWER_DOWN_CONTROL])
> +		qphy_setbits(pcs, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
> +			     cfg->pwrdn_ctrl);
>  	else
>  		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
Since, this register is in PCS block why check for dp_com_ctrl here?
Something like:

 	if (cfg->has_phy_com_ctrl) {
 		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
 			     SW_PWRDN);
	} else {
		if (cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL]) 
			qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL],
			     cfg->pwrdn_ctrl);
 		else
 			qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
	}

>  
> @@ -1671,10 +1675,12 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy)
>  	return ret;
>  }
>  
> -static int qcom_qmp_phy_com_exit(struct qcom_qmp *qmp)
> +static int qcom_qmp_phy_com_exit(struct qmp_phy *qphy)
>  {
> +	struct qcom_qmp *qmp = qphy->qmp;
>  	const struct qmp_phy_cfg *cfg = qmp->cfg;
>  	void __iomem *serdes = qmp->serdes;
> +	void __iomem *pcs = qphy->pcs;
>  	int i = cfg->num_resets;
>  
>  	mutex_lock(&qmp->phy_mutex);
> @@ -1691,6 +1697,9 @@ static int qcom_qmp_phy_com_exit(struct qcom_qmp *qmp)
>  			     SW_RESET);
>  		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
>  			     SW_PWRDN);
> +	} else if (cfg->has_phy_dp_com_ctrl && cfg->regs[QPHY_COM_POWER_DOWN_CONTROL]) {

Can we add change similar to init() here ?


> +			     cfg->pwrdn_ctrl);
>  	}
>  
>  	while (--i >= 0)
> @@ -1829,7 +1838,7 @@ static int qcom_qmp_phy_enable(struct phy *phy)
>  	if (cfg->has_lane_rst)
>  		reset_control_assert(qphy->lane_rst);
>  err_lane_rst:
> -	qcom_qmp_phy_com_exit(qmp);
> +	qcom_qmp_phy_com_exit(qphy);
>  
>  	return ret;
>  }
> @@ -1855,7 +1864,7 @@ static int qcom_qmp_phy_disable(struct phy *phy)
>  	if (cfg->has_lane_rst)
>  		reset_control_assert(qphy->lane_rst);
>  
> -	qcom_qmp_phy_com_exit(qmp);
> +	qcom_qmp_phy_com_exit(qphy);
>  
>  	qmp->phy_initialized = false;
>  

-- 
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