linux-kernel - Re: [PATCH 2/2] phy: qcom-qmp: fix pipe-clock imbalance on power-on failure

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Date:   Mon, 2 May 2022 15:39:41 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Evan Green <evgreen@...omium.org>
Subject: Re: [PATCH 2/2] phy: qcom-qmp: fix pipe-clock imbalance on power-on
 failure

On 20-04-22, 17:23, Johan Hovold wrote:
> Make sure to disable the pipe clock also if ufs-reset deassertion fails
> during power on.
> 
> Note that the ufs-reset is asserted in qcom_qmp_phy_com_exit().
> 
> Fixes: c9b589791fc1 ("phy: qcom: Utilize UFS reset controller")
> Cc: Evan Green <evgreen@...omium.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 8c2300bfe489..7d2d1ab061f7 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -5375,14 +5375,14 @@ static int qcom_qmp_phy_power_on(struct phy *phy)
>  		if (ret) {
>  			dev_err(qmp->dev, "lane%d reset deassert failed\n",
>  				qphy->index);
> -			goto err_lane_rst;
> +			return ret;

This can be skipped if we retain the err_lane_rst label

>  		}
>  	}
>  
>  	ret = clk_prepare_enable(qphy->pipe_clk);
>  	if (ret) {
>  		dev_err(qmp->dev, "pipe_clk enable failed err=%d\n", ret);
> -		goto err_clk_enable;
> +		goto err_reset_lane;
>  	}
>  
>  	/* Tx, Rx, and PCS configurations */
> @@ -5433,7 +5433,7 @@ static int qcom_qmp_phy_power_on(struct phy *phy)
>  
>  	ret = reset_control_deassert(qmp->ufs_reset);
>  	if (ret)
> -		goto err_lane_rst;
> +		goto err_disable_pipe_clk;

this is the actual fix...

>  
>  	qcom_qmp_phy_configure(pcs_misc, cfg->regs, cfg->pcs_misc_tbl,
>  			       cfg->pcs_misc_tbl_num);
> @@ -5472,17 +5472,17 @@ static int qcom_qmp_phy_power_on(struct phy *phy)
>  					 PHY_INIT_COMPLETE_TIMEOUT);
>  		if (ret) {
>  			dev_err(qmp->dev, "phy initialization timed-out\n");
> -			goto err_pcs_ready;
> +			goto err_disable_pipe_clk;

same rename here

>  		}
>  	}
>  	return 0;
>  
> -err_pcs_ready:
> +err_disable_pipe_clk:
>  	clk_disable_unprepare(qphy->pipe_clk);
> -err_clk_enable:
> +err_reset_lane:
>  	if (cfg->has_lane_rst)
>  		reset_control_assert(qphy->lane_rst);
> -err_lane_rst:
> +
>  	return ret;

while I feel the names given by this patch are better, they should not
be in a fix patch. We should just add the one line fix here and do
renames later

>  }
>  
> -- 
> 2.35.1

-- 
~Vinod