[PATCH v4 1/4] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature

Krishna Chaitanya Chundru
2025-02-06T23:29:14Z

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
iregion entirely for BAR region.

This 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>
---
arch/arm64/boot/dts/qcom/sc7280.dtsi | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
index 0f2caf36910b..64c46221d8bf 100644
--- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
@@ -2201,10 +2201,10 @@ wifi: wifi@17a10040 {
pcie1: pcie@1c08000 {
compatible = "qcom,pcie-sc7280";
reg = <0 0x01c08000 0 0x3000>,
- <0 0x40000000 0 0xf1d>,
- <0 0x40000f20 0 0xa8>,
- <0 0x40001000 0 0x1000>,
- <0 0x40100000 0 0x100000>;
+ <4 0x00000000 0 0xf1d>,
+ <4 0x00000f20 0 0xa8>,
+ <4 0x10000000 0 0x1000>,
+ <4 0x00000000 0 0x10000000>;

reg-names = "parf", "dbi", "elbi", "atu", "config";
device_type = "pci";
@@ -2215,8 +2215,8 @@ pcie1: pcie@1c08000 {
#address-cells = <3>;
#size-cells = <2>;

- ranges = <0x01000000 0x0 0x00000000 0x0 0x40200000 0x0 0x100000>,
- <0x02000000 0x0 0x40300000 0x0 0x40300000 0x0 0x1fd00000>;
+ ranges = <0x01000000 0x0 0x00000000 0x0 0x40000000 0x0 0x100000>,
+ <0x02000000 0x0 0x40100000 0x0 0x40100000 0x0 0x1ff00000>;

interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>,

--
2.34.1