linux-kernel - Re: [PATCH 05/12] pcie: qcom: add missing reset for ipq806x

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Message-ID: <20200323060620.GA1617@pengutronix.de>
Date:   Mon, 23 Mar 2020 07:06:20 +0100
From:   Philipp Zabel <pza@...gutronix.de>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Stanimir Varbanov <svarbanov@...sol.com>,
        Sham Muthayyan <smuthayy@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/12] pcie: qcom: add missing reset for ipq806x

Hi Ansuel,

On Fri, Mar 20, 2020 at 07:34:47PM +0100, Ansuel Smith wrote:
> Add missing ext reset used by ipq806x soc in
> pcie qcom driver
> 
> Signed-off-by: Sham Muthayyan <smuthayy@...eaurora.org>
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 596731b54728..ecc22fd27ea6 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -95,6 +95,7 @@ struct qcom_pcie_resources_2_1_0 {
>  	struct reset_control *ahb_reset;
>  	struct reset_control *por_reset;
>  	struct reset_control *phy_reset;
> +	struct reset_control *ext_reset;
>  	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
>  };
>  
> @@ -272,6 +273,10 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
>  	if (IS_ERR(res->por_reset))
>  		return PTR_ERR(res->por_reset);
>  
> +	res->ext_reset = devm_reset_control_get(dev, "ext");

Please use devm_reset_control_get_exclusive() instead.

> +	if (IS_ERR(res->ext_reset))
> +		return PTR_ERR(res->ext_reset);
> +
>  	res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
>  	return PTR_ERR_OR_ZERO(res->phy_reset);
>  }
> @@ -285,6 +290,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
>  	reset_control_assert(res->axi_reset);
>  	reset_control_assert(res->ahb_reset);
>  	reset_control_assert(res->por_reset);
> +	reset_control_assert(res->ext_reset);
>  	reset_control_assert(res->phy_reset);
>  	clk_disable_unprepare(res->iface_clk);
>  	clk_disable_unprepare(res->core_clk);
> @@ -301,18 +307,18 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
>  	u32 val;
>  	int ret;
>  
> +	ret = reset_control_assert(res->ahb_reset);
> +	if (ret) {
> +		dev_err(dev, "cannot assert ahb reset\n");
> +		return ret;
> +	}
> +
>  	ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
>  	if (ret < 0) {
>  		dev_err(dev, "cannot enable regulators\n");
>  		return ret;
>  	}
>  
> -	ret = reset_control_assert(res->ahb_reset);
> -	if (ret) {
> -		dev_err(dev, "cannot assert ahb reset\n");
> -		goto err_assert_ahb;
> -	}
> -

This change is not described in the commit message.

regards
Philipp