[PATCH u-boot-pci] pci: iproc: Set all 24 bits of PCI class code

[Roman Bacik]

On Wed, Jan 5, 2022 at 1:50 AM Pali Rohár <pali at kernel.org> wrote:
>
> Register 0x43c in its low 24 bits contains PCI class code.
>
> Update code to set all 24 bits of PCI class code and not only upper 16 bits
> of PCI class code.
>
> Use standard U-Boot macro (PCI_CLASS_BRIDGE_PCI << 8) for constructing all
> 24-bits of PCI class for PCI bridge Normal decode.
>
> Signed-off-by: Pali Rohár <pali at kernel.org>
>
> ---
> Roman helped me with this change and confirmed that class code is stored
> really in bits [23:0] of custom register 0x43c (normally class code is
> stored in bits [31:8] of pci register 0x08).
> ---
>  drivers/pci/pcie_iproc.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/pcie_iproc.c b/drivers/pci/pcie_iproc.c
> index be03dcbd97c0..fe68e417ae80 100644
> --- a/drivers/pci/pcie_iproc.c
> +++ b/drivers/pci/pcie_iproc.c
> @@ -1127,15 +1127,14 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>         u32 link_status, class;
>
>         pcie->link_is_active = false;
> -       /* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
> +       /* force class to PCI bridge Normal decode (0x060400) */
>  #define PCI_BRIDGE_CTRL_REG_OFFSET      0x43c
> -#define PCI_CLASS_BRIDGE_MASK           0xffff00
> -#define PCI_CLASS_BRIDGE_SHIFT          8
> +#define PCI_BRIDGE_CTRL_REG_CLASS_MASK  0xffffff
>         iproc_pci_raw_config_read32(pcie, 0,
>                                     PCI_BRIDGE_CTRL_REG_OFFSET,
>                                     4, &class);
> -       class &= ~PCI_CLASS_BRIDGE_MASK;
> -       class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
> +       class &= ~PCI_BRIDGE_CTRL_REG_CLASS_MASK;
> +       class |= (PCI_CLASS_BRIDGE_PCI << 8);
>         iproc_pci_raw_config_write32(pcie, 0,
>                                      PCI_BRIDGE_CTRL_REG_OFFSET,
>                                      4, class);
> --
> 2.20.1
>

Acked-by: Roman Bacik <roman.bacik at broadcom.com>

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