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SubjectRe: [PATCHv2] PCI: designware-ep: Fix the Header Type check
On Tue, Aug 18, 2020 at 05:27:46PM +0800, Zhiqiang Hou wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
>
> The current check will result in the multiple function device
> fails to initialize. So fix the check by masking out the
> multiple function bit.
>
> Fixes: 0b24134f7888 ("PCI: dwc: Add validation that PCIe core is set to correct mode")
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> ---
> V2:
> - Add marco PCI_HEADER_TYPE_MASK and print the masked value.
>
> drivers/pci/controller/dwc/pcie-designware-ep.c | 3 ++-
> include/uapi/linux/pci_regs.h | 1 +
> 2 files changed, 3 insertions(+), 1 deletion(-)

Applied to pci/dwc, thanks.

Lorenzo

> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 4680a51c49c0..0634bd3a0b96 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -653,7 +653,8 @@ int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep)
> u32 reg;
> int i;
>
> - hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE);
> + hdr_type = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE) &
> + PCI_HEADER_TYPE_MASK;
> if (hdr_type != PCI_HEADER_TYPE_NORMAL) {
> dev_err(pci->dev,
> "PCIe controller is not set to EP mode (hdr_type:0x%x)!\n",
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index f9701410d3b5..57a222014cd2 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -76,6 +76,7 @@
> #define PCI_CACHE_LINE_SIZE 0x0c /* 8 bits */
> #define PCI_LATENCY_TIMER 0x0d /* 8 bits */
> #define PCI_HEADER_TYPE 0x0e /* 8 bits */
> +#define PCI_HEADER_TYPE_MASK 0x7f
> #define PCI_HEADER_TYPE_NORMAL 0
> #define PCI_HEADER_TYPE_BRIDGE 1
> #define PCI_HEADER_TYPE_CARDBUS 2
> --
> 2.17.1
>

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