linux-kernel - Re: [PATCH 08/20] phy: qcom-qmp-combo: clean up status polling

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Date:   Thu, 13 Oct 2022 00:14:17 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/20] phy: qcom-qmp-combo: clean up status polling

On 12/10/2022 11:49, Johan Hovold wrote:
> Clean up the PHY status polling by dropping the configuration mask which
> is no longer needed since the QMP driver split.
> 
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

This comes in expectation that 4.20 / 5.20 PHYs will be limited to PCIe. 
I'd add this to the commit message. With that fixed:

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

> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 14 ++------------
>   1 file changed, 2 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 82055d3a3536..e312cad6d9c2 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -853,8 +853,6 @@ struct qmp_phy_cfg {
>   
>   	unsigned int start_ctrl;
>   	unsigned int pwrdn_ctrl;
> -	/* bit offset of PHYSTATUS in QPHY_PCS_STATUS register */
> -	unsigned int phy_status;
>   
>   	/* true, if PHY needs delay after POWER_DOWN */
>   	bool has_pwrdn_delay;
> @@ -1023,7 +1021,6 @@ static const struct qmp_phy_cfg sc7180_usb3phy_cfg = {
>   
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
> -	.phy_status		= PHYSTATUS,
>   
>   	.has_pwrdn_delay	= true,
>   };
> @@ -1092,7 +1089,6 @@ static const struct qmp_phy_cfg sdm845_usb3phy_cfg = {
>   
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
> -	.phy_status		= PHYSTATUS,
>   
>   	.has_pwrdn_delay	= true,
>   };
> @@ -1127,7 +1123,6 @@ static const struct qmp_phy_cfg sm8150_usb3phy_cfg = {
>   
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
> -	.phy_status		= PHYSTATUS,
>   
>   	.has_pwrdn_delay	= true,
>   };
> @@ -1197,7 +1192,6 @@ static const struct qmp_phy_cfg sc8280xp_usb43dp_usb_cfg = {
>   
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
> -	.phy_status		= PHYSTATUS,
>   };
>   
>   static const struct qmp_phy_cfg sc8280xp_usb43dp_dp_cfg = {
> @@ -1267,7 +1261,6 @@ static const struct qmp_phy_cfg sm8250_usb3phy_cfg = {
>   
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
> -	.phy_status		= PHYSTATUS,
>   
>   	.has_pwrdn_delay	= true,
>   };
> @@ -2017,7 +2010,7 @@ static int qmp_combo_power_on(struct phy *phy)
>   	void __iomem *rx = qphy->rx;
>   	void __iomem *pcs = qphy->pcs;
>   	void __iomem *status;
> -	unsigned int mask, val, ready;
> +	unsigned int val;
>   	int ret;
>   
>   	qmp_combo_serdes_init(qphy);
> @@ -2059,10 +2052,7 @@ static int qmp_combo_power_on(struct phy *phy)
>   		qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
>   
>   		status = pcs + cfg->regs[QPHY_PCS_STATUS];
> -		mask = cfg->phy_status;
> -		ready = 0;
> -
> -		ret = readl_poll_timeout(status, val, (val & mask) == ready, 10,
> +		ret = readl_poll_timeout(status, val, !(val & PHYSTATUS), 10,
>   					 PHY_INIT_COMPLETE_TIMEOUT);
>   		if (ret) {
>   			dev_err(qmp->dev, "phy initialization timed-out\n");

-- 
With best wishes
Dmitry