linux-kernel - Re: [PATCH 1/3] PCI: dwc: Add support for vendor specific capability search

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Message-ID: <20240701115550.00004200@Huawei.com>
Date: Mon, 1 Jul 2024 11:55:50 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Shradha Todi <shradha.t@...sung.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<manivannan.sadhasivam@...aro.org>, <lpieralisi@...nel.org>, <kw@...ux.com>,
	<robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
	<fancer.lancer@...il.com>, <yoshihiro.shimoda.uh@...esas.com>,
	<conor.dooley@...rochip.com>, <pankaj.dubey@...sung.com>,
	<gost.dev@...sung.com>
Subject: Re: [PATCH 1/3] PCI: dwc: Add support for vendor specific
 capability search

On Tue, 25 Jun 2024 15:08:11 +0530
Shradha Todi <shradha.t@...sung.com> wrote:

> Add vendor specific extended configuration space capability search API
> using struct dw_pcie pointer for DW controllers.
> 
> Signed-off-by: Shradha Todi <shradha.t@...sung.com>
> ---
>  drivers/pci/controller/dwc/pcie-designware.c | 16 ++++++++++++++++
>  drivers/pci/controller/dwc/pcie-designware.h |  1 +
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 250cf7f40b85..b74e4a97558e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -275,6 +275,22 @@ static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
>  	return 0;
>  }
>  
> +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap)
> +{
> +	u16 vsec = 0;
> +	u32 header;
> +
> +	while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec,
> +					PCI_EXT_CAP_ID_VNDR))) {

Trivial but one more set of outer brackets than makes sense here.

> +		header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
> +		if (PCI_VNDR_HEADER_ID(header) == vsec_cap)
> +			return vsec;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability);
> +
>  u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
>  {
>  	return dw_pcie_find_next_ext_capability(pci, 0, cap);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index f8e5431a207b..77686957a30d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -423,6 +423,7 @@ void dw_pcie_version_detect(struct dw_pcie *pci);
>  
>  u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap);
>  u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap);
> +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap);
>  
>  int dw_pcie_read(void __iomem *addr, int size, u32 *val);
>  int dw_pcie_write(void __iomem *addr, int size, u32 val);