linux-kernel - Re: [PATCH RESEND v4 06/15] PCI: intel-gw: Drop manual DW PCIe controller version setup

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Message-ID: <20220801132817.GF93763@thinkpad>
Date:   Mon, 1 Aug 2022 18:58:17 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rahul Tanwar <rtanwar@...linear.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Frank Li <Frank.Li@....com>, Rob Herring <robh+dt@...nel.org>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, eswara.kota@...ux.intel.com
Subject: Re: [PATCH RESEND v4 06/15] PCI: intel-gw: Drop manual DW PCIe
 controller version setup

On Fri, Jun 24, 2022 at 05:39:38PM +0300, Serge Semin wrote:
> Since the DW PCIe common code now supports the IP-core version
> auto-detection there is no point manually setting the version up for the
> controllers newer than v4.70a. In particular Intel GW PCIe platform code
> can be set free from the manual version setup, which as a positive side
> effect causes the private device data removal too.
> 
> Suggested-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

I don't have a hardware to test. But going by the DWC spec, this looks good to
me.

CCed the author of this driver, "Dilip Kota" in case he can confirm.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> 
> ---
> 
> Folks, I don't have Intel GW PCIe hw instance to test it out. Could you
> please make sure this patch doesn't brake anything?
> 
> Changelog v3:
> - This is a new patch create as a result of the discussion:
>   https://lore.kernel.org/linux-pci/20220503214638.1895-6-Sergey.Semin@baikalelectronics.ru/
> ---
>  drivers/pci/controller/dwc/pcie-intel-gw.c | 16 +---------------
>  1 file changed, 1 insertion(+), 15 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
> index 371b5aa189d1..a44f685ec94d 100644
> --- a/drivers/pci/controller/dwc/pcie-intel-gw.c
> +++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
> @@ -58,10 +58,6 @@
>  #define BUS_IATU_OFFSET			SZ_256M
>  #define RESET_INTERVAL_MS		100
>  
> -struct intel_pcie_soc {
> -	u32	pcie_ver;
> -};
> -
>  struct intel_pcie {
>  	struct dw_pcie		pci;
>  	void __iomem		*app_base;
> @@ -394,13 +390,8 @@ static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
>  	.host_init =		intel_pcie_rc_init,
>  };
>  
> -static const struct intel_pcie_soc pcie_data = {
> -	.pcie_ver =		DW_PCIE_VER_520A,
> -};
> -
>  static int intel_pcie_probe(struct platform_device *pdev)
>  {
> -	const struct intel_pcie_soc *data;
>  	struct device *dev = &pdev->dev;
>  	struct intel_pcie *pcie;
>  	struct dw_pcie_rp *pp;
> @@ -424,12 +415,7 @@ static int intel_pcie_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	data = device_get_match_data(dev);
> -	if (!data)
> -		return -ENODEV;
> -
>  	pci->ops = &intel_pcie_ops;
> -	pci->version = data->pcie_ver;
>  	pp->ops = &intel_pcie_dw_ops;
>  
>  	ret = dw_pcie_host_init(pp);
> @@ -447,7 +433,7 @@ static const struct dev_pm_ops intel_pcie_pm_ops = {
>  };
>  
>  static const struct of_device_id of_intel_pcie_match[] = {
> -	{ .compatible = "intel,lgm-pcie", .data = &pcie_data },
> +	{ .compatible = "intel,lgm-pcie" },
>  	{}
>  };
>  
> -- 
> 2.35.1
> 

-- 
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