[U-Boot] [PATCH 1/3] drivers: pci: Fix Host bridge bus number issue

[Bin Meng <bmeng.cn@gmail.com>]

Hi Vladimir,

On Sat, Nov 23, 2019 at 6:23 AM Vladimir Olovyannikov
<vladimir.olovyannikov@broadcom.com> wrote:
>
> From: Srinath Mannam <srinath.mannam@broadcom.com>
>
> Add changes to fix bus number of host bridge is set with device
> sequence number issue.
> All devices are managed using device sequence number. For PCIe,
> devices enabled in DTS are added under PCIE_CLASS with consecutive
> device sequence numbers to scan all pcie devices in sequence using
> device sequence number. If a device is a bridge then it will enumerate
> all endpoints in that bridge, and give sequence numbers in that order.
> However, the parent device is a root bridge.
> The solution is all bus numbers are device sequence number minus
> root bridge sequence number. This way, every root bridge and its
> downstream EPs bus numbers start from 0.
> So root bridges are different hierarchy of bus numbers.

Could you please give an example for better understanding?

>
> Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
> Signed-off-by: Vladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>
> ---
>  drivers/pci/pci-uclass.c | 8 +++++---
>  drivers/pci/pci_auto.c   | 6 +++++-
>  2 files changed, 10 insertions(+), 4 deletions(-)
>

Regards,
Bin