diff mbox series

[v4,3/3] PCI: xilinx-nwl: Increase ECAM size to accommodate 256 buses

Message ID 20230814171406.214932-5-thippeswamy.havalige@amd.com
State New
Headers show
Series [v4,1/3] dt-bindings: PCI: xilinx-nwl: Modify ECAM size in example | expand

Commit Message

Havalige, Thippeswamy Aug. 14, 2023, 5:14 p.m. UTC 
Our controller is expecting ECAM size to be programmed by software. By
programming "NWL_ECAM_VALUE_DEFAULT  12" controller can access up to 16MB
ECAM region which is used to detect 16 buses, so by updating
"NWL_ECAM_VALUE_DEFAULT" to 16 so that controller can access up to 256MB
ECAM region to detect 256 buses.

Nothing will break, when having a DT with the smaller ECAM size and boot a
kernel that includes this change,but the kernel will only be able to use 16
buses.

Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@amd.com>
---
Changes in v4:
Move modified ECAM max size macro into a seperate patch.
 drivers/pci/controller/pcie-xilinx-nwl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
index 8fe0e8a325b0..e307aceba5c9 100644
--- a/drivers/pci/controller/pcie-xilinx-nwl.c
+++ b/drivers/pci/controller/pcie-xilinx-nwl.c
@@ -126,7 +126,7 @@ 
 #define E_ECAM_CR_ENABLE		BIT(0)
 #define E_ECAM_SIZE_LOC			GENMASK(20, 16)
 #define E_ECAM_SIZE_SHIFT		16
-#define NWL_ECAM_MAX_SIZE		12
+#define NWL_ECAM_MAX_SIZE		16
 
 #define CFG_DMA_REG_BAR			GENMASK(2, 0)
 #define CFG_PCIE_CACHE			GENMASK(7, 0)