linux-kernel - [PATCH v3 2/2] PCI: xilinx-nwl: Increase ECAM size to accommodate 256 buses

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Message-ID: <20230810122002.133531-4-thippeswamy.havalige@amd.com>
Date:   Thu, 10 Aug 2023 17:50:02 +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 v3 2/2] 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.

Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@....com>
---
changes in v3:
- Remove unnecessary period at end of subject line.
changes in v2:
- Update this changes in a seperate patch.
---
 drivers/pci/controller/pcie-xilinx-nwl.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
index d8a3a08be1d5..b51501921d3b 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_VALUE_DEFAULT		12
+#define NWL_ECAM_VALUE_DEFAULT		16
 
 #define CFG_DMA_REG_BAR			GENMASK(2, 0)
 #define CFG_PCIE_CACHE			GENMASK(7, 0)
@@ -165,7 +165,6 @@ struct nwl_pcie {
 	u32 ecam_size;
 	int irq_intx;
 	int irq_misc;
-	u32 ecam_value;
 	struct nwl_msi msi;
 	struct irq_domain *legacy_irq_domain;
 	struct clk *clk;
@@ -674,7 +673,7 @@ static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
 			  E_ECAM_CR_ENABLE, E_ECAM_CONTROL);
 
 	nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) |
-			  (pcie->ecam_value << E_ECAM_SIZE_SHIFT),
+			  (NWL_ECAM_VALUE_DEFAULT << E_ECAM_SIZE_SHIFT),
 			  E_ECAM_CONTROL);
 
 	nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base),
@@ -782,7 +781,6 @@ static int nwl_pcie_probe(struct platform_device *pdev)
 	pcie = pci_host_bridge_priv(bridge);
 
 	pcie->dev = dev;
-	pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT;
 
 	err = nwl_pcie_parse_dt(pcie, pdev);
 	if (err) {
-- 
2.17.1