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

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Message-ID: <20230814171406.214932-5-thippeswamy.havalige@amd.com>
Date:   Mon, 14 Aug 2023 22:44:06 +0530
From:   Thippeswamy Havalige <thippeswamy.havalige@....com>
To:     <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <bhelgaas@...gle.com>, <krzysztof.kozlowski@...aro.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <conor+dt@...nel.org>
CC:     <lpieralisi@...nel.org>, <bharat.kumar.gogada@....com>,
        <michal.simek@....com>, <linux-arm-kernel@...ts.infradead.org>,
        "Thippeswamy Havalige" <thippeswamy.havalige@....com>
Subject: [PATCH v4 3/3] PCI: xilinx-nwl: Increase ECAM size to accommodate 256 buses

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@....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 --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)
-- 
2.17.1