Re: [PATCH v3 1/4] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature

Manivannan Sadhasivam
2025-01-24T05:40:29Z

On Tue, Jan 21, 2025 at 02:32:19PM +0530, Krishna Chaitanya Chundru wrote:
> PCIe ECAM(Enhanced Configuration Access Mechanism) feature requires
> maximum of 256MB configuration space.
>
> To enable this feature increase configuration space size to 256MB. If
> the config space is increased, the BAR space needs to be truncated as
> it resides in the same location. To avoid the bar space truncation move
> config space, DBI, ELBI, iATU to upper PCIe region and use lower PCIe
> region entirely for BAR region.
>

You also need to mention that this change depends on the commit: '10ba0854c5e6
("PCI: qcom: Disable mirroring of DBI and iATU register space in BAR region")'

> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

- Mani

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