linux-kernel - R: [PATCH v2 01/10] PCIe: qcom: add missing ipq806x clocks in PCIe driver

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Date:   Wed, 8 Apr 2020 14:36:10 +0200
From:   <ansuelsmth@...il.com>
To:     "'Stanimir Varbanov'" <svarbanov@...sol.com>,
        "'Andy Gross'" <agross@...nel.org>
Cc:     "'Sham Muthayyan'" <smuthayy@...eaurora.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>,
        "'Philipp Zabel'" <p.zabel@...gutronix.de>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: R: [PATCH v2 01/10] PCIe: qcom: add missing ipq806x clocks in PCIe driver

> PCIe driver
> 
> Ansuel,
> 
> On 4/2/20 3:11 PM, Ansuel Smith wrote:
> > Aux and Ref clk are missing in pcie qcom driver.
> > Add support in the driver to fix pcie inizialization in ipq806x.
> >
> > Fixes: 82a82383 PCI: qcom: Add Qualcomm PCIe controller driver
> 
> this should be:
> 
> Fixes: 82a823833f4e PCI: qcom: Add Qualcomm PCIe controller driver
> 
> and add:
> 
> Cc: stable@...r.kernel.org # v4.5+
> 
> But, I wonder, as apq8064 shares the same ops_2_1_0 how it worked until
> now. Something more I cannot find such clocks for apq8064, which means
> that this patch will break it.
> 
> One option is to use those new clocks only for ipq806x.
> 

How to add this new clocks only for ipq806x? Check the compatible and add
them accordingly? 

> > Signed-off-by: Sham Muthayyan <smuthayy@...eaurora.org>
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> >  drivers/pci/controller/dwc/pcie-qcom.c | 38
> ++++++++++++++++++++++----
> >  1 file changed, 33 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c
> b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 5ea527a6bd9f..f958c535de6e 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -88,6 +88,8 @@ struct qcom_pcie_resources_2_1_0 {
> >  	struct clk *iface_clk;
> >  	struct clk *core_clk;
> >  	struct clk *phy_clk;
> > +	struct clk *aux_clk;
> > +	struct clk *ref_clk;
> >  	struct reset_control *pci_reset;
> >  	struct reset_control *axi_reset;
> >  	struct reset_control *ahb_reset;
> > @@ -246,6 +248,14 @@ static int
> qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
> >  	if (IS_ERR(res->phy_clk))
> >  		return PTR_ERR(res->phy_clk);
> >
> > +	res->aux_clk = devm_clk_get(dev, "aux");
> > +	if (IS_ERR(res->aux_clk))
> > +		return PTR_ERR(res->aux_clk);
> > +
> > +	res->ref_clk = devm_clk_get(dev, "ref");
> > +	if (IS_ERR(res->ref_clk))
> > +		return PTR_ERR(res->ref_clk);
> > +
> >  	res->pci_reset = devm_reset_control_get_exclusive(dev, "pci");
> >  	if (IS_ERR(res->pci_reset))
> >  		return PTR_ERR(res->pci_reset);
> > @@ -278,6 +288,8 @@ static void qcom_pcie_deinit_2_1_0(struct
> qcom_pcie *pcie)
> >  	clk_disable_unprepare(res->iface_clk);
> >  	clk_disable_unprepare(res->core_clk);
> >  	clk_disable_unprepare(res->phy_clk);
> > +	clk_disable_unprepare(res->aux_clk);
> > +	clk_disable_unprepare(res->ref_clk);
> >  	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
> >  }
> >
> > @@ -307,16 +319,28 @@ static int qcom_pcie_init_2_1_0(struct
> qcom_pcie *pcie)
> >  		goto err_assert_ahb;
> >  	}
> >
> > +	ret = clk_prepare_enable(res->core_clk);
> > +	if (ret) {
> > +		dev_err(dev, "cannot prepare/enable core clock\n");
> > +		goto err_clk_core;
> > +	}
> > +
> >  	ret = clk_prepare_enable(res->phy_clk);
> >  	if (ret) {
> >  		dev_err(dev, "cannot prepare/enable phy clock\n");
> >  		goto err_clk_phy;
> >  	}
> >
> > -	ret = clk_prepare_enable(res->core_clk);
> > +	ret = clk_prepare_enable(res->aux_clk);
> >  	if (ret) {
> > -		dev_err(dev, "cannot prepare/enable core clock\n");
> > -		goto err_clk_core;
> > +		dev_err(dev, "cannot prepare/enable aux clock\n");
> > +		goto err_clk_aux;
> > +	}
> > +
> > +	ret = clk_prepare_enable(res->ref_clk);
> > +	if (ret) {
> > +		dev_err(dev, "cannot prepare/enable ref clock\n");
> > +		goto err_clk_ref;
> >  	}
> >
> >  	ret = reset_control_deassert(res->ahb_reset);
> > @@ -372,10 +396,14 @@ static int qcom_pcie_init_2_1_0(struct
> qcom_pcie *pcie)
> >  	return 0;
> >
> >  err_deassert_ahb:
> > -	clk_disable_unprepare(res->core_clk);
> > -err_clk_core:
> > +	clk_disable_unprepare(res->ref_clk);
> > +err_clk_ref:
> > +	clk_disable_unprepare(res->aux_clk);
> > +err_clk_aux:
> >  	clk_disable_unprepare(res->phy_clk);
> >  err_clk_phy:
> > +	clk_disable_unprepare(res->core_clk);
> > +err_clk_core:
> >  	clk_disable_unprepare(res->iface_clk);
> >  err_assert_ahb:
> >  	regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
> >
> 
> --
> regards,
> Stan