[PATCH] pci-host-ecam-generic: access config space independent of system-wide bus id

[Alexandru Marginean]

On 3/13/2020 12:04 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean at nxp.com>
> 
> The pci-host-ecam-generic code assumes that the ECAM is the first PCI
> bus in the system to be probed. Therefore, the system-wide bus number
> allocated by U-Boot in sequence for it is going to be zero, which
> corresponds to the memory-mapped config spaces found within it.
> 
> Reuse the logic from other PCI bus drivers, and assume that U-Boot will
> allocate bus numbers in sequence for all buses within the current ECAM.
> So the base number of the bus needs to be subtracted when indexing the
> correct config space.
> 
> Fixes: 3675cb044e68 ("PCI: Add driver for a 'pci-host-ecam-generic' host controller")
> Signed-off-by: Vladimir Oltean <vladimir.oltean at nxp.com>
> ---
>   drivers/pci/pcie_ecam_generic.c | 36 +++++++++++++++++++++++++++++----
>   1 file changed, 32 insertions(+), 4 deletions(-)
> 

Reviewed-by: Alex Marginean <alexandru.marginean at nxp.com>