linux-kernel - Re: [PATCH v3] phy/qcom-qmp-combo: propagate correct return value at phy_power

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Date: Wed, 3 Apr 2024 10:22:37 -0700
From: Kuogee Hsieh <quic_khsieh@...cinc.com>
To: <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <abel.vesa@...aro.org>, <andersson@...nel.org>
CC: <quic_abhinavk@...cinc.com>, <quic_jesszhan@...cinc.com>,
        <quic_sbillaka@...cinc.com>, <marijn.suijten@...ainline.org>,
        <freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] phy/qcom-qmp-combo: propagate correct return value at
 phy_power_on()

Dmitry,

Any more comments?

On 3/29/2024 12:50 PM, Kuogee Hsieh wrote:
> Currently qmp_combo_dp_power_on() always return 0 in regardless of
> return value of cfg->configure_dp_phy(). This patch propagate
> return value of cfg->configure_dp_phy() all the way back to caller.
>
> Changes in V3:
> -- add v2 changes log
>
> Changes in V2:
> -- add Fixes tag
> -- add dev_err() to qmp_v3_configure_dp_phy()
> -- add dev_err() to qmp_v4_configure_dp_phy()
>
> Fixes: 52e013d0bffa ("phy: qcom-qmp: Add support for DP in USB3+DP combo phy")
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> ---
>   drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 13 +++++++++----
>   1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> index 36632fa..513d99d 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
> @@ -2343,8 +2343,10 @@ static int qmp_v3_configure_dp_phy(struct qmp_combo *qmp)
>   	writel(0x05, qmp->dp_dp_phy + QSERDES_V3_DP_PHY_TX2_TX3_LANE_CTL);
>   
>   	ret = qmp_combo_configure_dp_clocks(qmp);
> -	if (ret)
> +	if (ret) {
> +		dev_err(qmp->dev, "dp phy configure failed, err=%d\n", ret);
>   		return ret;
> +	}
>   
>   	writel(0x04, qmp->dp_dp_phy + QSERDES_DP_PHY_AUX_CFG2);
>   	writel(0x01, qmp->dp_dp_phy + QSERDES_DP_PHY_CFG);
> @@ -2519,8 +2521,10 @@ static int qmp_v4_configure_dp_phy(struct qmp_combo *qmp)
>   	int ret;
>   
>   	ret = qmp_v456_configure_dp_phy(qmp);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		dev_err(qmp->dev, "dp phy configure failed, err=%d\n", ret);
>   		return ret;
> +	}
>   
>   	/*
>   	 * At least for 7nm DP PHY this has to be done after enabling link
> @@ -2754,6 +2758,7 @@ static int qmp_combo_dp_power_on(struct phy *phy)
>   	const struct qmp_phy_cfg *cfg = qmp->cfg;
>   	void __iomem *tx = qmp->dp_tx;
>   	void __iomem *tx2 = qmp->dp_tx2;
> +	int ret;
>   
>   	mutex_lock(&qmp->phy_mutex);
>   
> @@ -2766,11 +2771,11 @@ static int qmp_combo_dp_power_on(struct phy *phy)
>   	cfg->configure_dp_tx(qmp);
>   
>   	/* Configure link rate, swing, etc. */
> -	cfg->configure_dp_phy(qmp);
> +	ret = cfg->configure_dp_phy(qmp);
>   
>   	mutex_unlock(&qmp->phy_mutex);
>   
> -	return 0;
> +	return ret;
>   }
>   
>   static int qmp_combo_dp_power_off(struct phy *phy)