linux-kernel - Re: [PATCH v2 4/5] PCI: qcom: Add SM8250 SoC support

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Date:   Thu, 1 Oct 2020 11:04:45 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Stanimir Varbanov <svarbanov@...sol.com>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com,
        vkoul@...nel.org, robh@...nel.org, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        mgautam@...eaurora.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 4/5] PCI: qcom: Add SM8250 SoC support

Hi Stan,

On Thu, Oct 01, 2020 at 12:56:28AM +0300, Stanimir Varbanov wrote:
> Hi Mani,
> 
> On 9/30/20 6:09 PM, Manivannan Sadhasivam wrote:
> > The PCIe IP on SM8250 SoC is similar to the one used on SDM845. Hence
> > the support is added reusing the members of ops_2_7_0. The key
> > difference between ops_2_7_0 and ops_sm8250 is the config_sid callback,
> > which will be added in successive commit.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  drivers/pci/controller/dwc/pcie-qcom.c | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> > index 3aac77a295ba..44db91861b47 100644
> > --- a/drivers/pci/controller/dwc/pcie-qcom.c
> > +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> > @@ -1359,6 +1359,16 @@ static const struct qcom_pcie_ops ops_2_7_0 = {
> >  	.post_deinit = qcom_pcie_post_deinit_2_7_0,
> >  };
> >  
> > +/* Qcom IP rev.: 1.9.0 */
> > +static const struct qcom_pcie_ops ops_sm8250 = {
> 
> This breaks the policy compatible -> ops_X_Y_Z. Could you introduce new
> method config_sid and check into for compatible qcom,pcie-sm8250 string
> there?
> 

I thought about it but during previous submission review Bjorn mentioned that
this config_sid got introduced in SM8150 and there might be chances that future
SoCs could also use it. That's why I was inclined to introduce a new ops instead
of checking for the compatible.

And the reason to use "sm8250" instead of IP revision is that I can't find the
Synopsys IP revision for this. But if you strongly prefer IP revision then I can
just use "ops_1_9_0"!

Thanks,
Mani

> > +	.get_resources = qcom_pcie_get_resources_2_7_0,
> > +	.init = qcom_pcie_init_2_7_0,
> > +	.deinit = qcom_pcie_deinit_2_7_0,
> > +	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> > +	.post_init = qcom_pcie_post_init_2_7_0,
> > +	.post_deinit = qcom_pcie_post_deinit_2_7_0,
> > +};
> > +
> >  static const struct dw_pcie_ops dw_pcie_ops = {
> >  	.link_up = qcom_pcie_link_up,
> >  };
> > @@ -1476,6 +1486,7 @@ static const struct of_device_id qcom_pcie_match[] = {
> >  	{ .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
> >  	{ .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 },
> >  	{ .compatible = "qcom,pcie-sdm845", .data = &ops_2_7_0 },
> > +	{ .compatible = "qcom,pcie-sm8250", .data = &ops_sm8250 },
> >  	{ }
> >  };
> >  
> > 
> 
> -- 
> regards,
> Stan