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SubjectRe: [PATCH 1/3] PCI: dwc: Add support for vendor specific capability search
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On 5/18/2021 11:16 PM, Shradha Todi wrote:
> External email: Use caution opening links or attachments
>
>
> Add vendor specific extended configuration space capability search API
> using struct dw_pcie pointer for DW controllers.
>
> Signed-off-by: Shradha Todi <shradha.t@samsung.com>
> ---
> drivers/pci/controller/dwc/pcie-designware.c | 16 ++++++++++++++++
> drivers/pci/controller/dwc/pcie-designware.h | 4 ++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index a945f0c0e73d..348f6f696976 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -90,6 +90,22 @@ 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))) {
> + 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 7d6e9b7576be..307525aaa063 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -155,6 +155,9 @@
> #define MAX_IATU_IN 256
> #define MAX_IATU_OUT 256
>
> +/* Synopsys Vendor specific data */
> +#define DW_PCIE_RAS_CAP_ID 0x2
This is not used in this patch. Better to move it to the second patch in
this series where it is used.

> +
> struct pcie_port;
> struct dw_pcie;
> struct dw_pcie_ep;
> @@ -284,6 +287,7 @@ struct dw_pcie {
>
> 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);
> --
> 2.17.1
>

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