linux-kernel - Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

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Date:   Fri, 20 Dec 2019 08:22:32 +0800
From:   cang@...eaurora.org
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Asutosh Das <asutoshd@...eaurora.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

On 2019-12-19 23:04, Vinod Koul wrote:
> For V4 QMP UFS Phy, we need to assert reset bits, configure the phy and
> then deassert it, so add optional has_sw_reset flag and use that to
> configure the QPHY_SW_RESET register.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c
> b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 06f971ca518e..80304b7cd895 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -1023,6 +1023,9 @@ struct qmp_phy_cfg {
> 
>  	/* true, if PCS block has no separate SW_RESET register */
>  	bool no_pcs_sw_reset;
> +
> +	/* true if sw reset needs to be invoked */
> +	bool has_sw_reset;
>  };
> 
>  /**
> @@ -1391,6 +1394,7 @@ static const struct qmp_phy_cfg sm8150_ufsphy_cfg 
> = {
> 
>  	.is_dual_lane_phy	= true,
>  	.no_pcs_sw_reset	= true,
> +	.has_sw_reset		= true,
>  };
> 
>  static void qcom_qmp_phy_configure(void __iomem *base,
> @@ -1475,6 +1479,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy 
> *qphy)
>  			     SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
>  	}
> 
> +	if (cfg->has_sw_reset)
> +		qphy_setbits(serdes, cfg->regs[QPHY_SW_RESET], SW_RESET);
> +

Are you sure you want to set this in the serdes register? QPHY_SW_RESET
is in its pcs register.

>  	if (cfg->has_phy_com_ctrl)
>  		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
>  			     SW_PWRDN);
> @@ -1651,6 +1658,9 @@ static int qcom_qmp_phy_enable(struct phy *phy)
>  	if (cfg->has_phy_dp_com_ctrl)
>  		qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
> 
> +	if (cfg->has_sw_reset)
> +		qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
> +

Yet you are clearing it from pcs register.

Regards,
Can Guo

>  	/* start SerDes and Phy-Coding-Sublayer */
>  	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);