linux-kernel - [PATCH] PCI: xilinx-nwl: Remove unnecessary code and updating ecam default value.

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Date:   Thu, 3 Aug 2023 17:20:16 +0530
From:   Thippeswamy Havalige <thippeswamy.havalige@....com>
To:     <linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
        <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>
CC:     <krzysztof.kozlowski@...aro.org>, <lpieralisi@...nel.org>,
        <bharat.kumar.gogada@....com>, <michal.simek@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Thippeswamy Havalige <thippeswamy.havalige@....com>
Subject: [PATCH] PCI: xilinx-nwl: Remove unnecessary code and updating ecam default value.

Remove reduntant code.
Change NWL_ECAM_VALUE_DEFAULT to 16 to support maximum 256 buses.

Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@....com>
---
 drivers/pci/controller/pcie-xilinx-nwl.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
index 176686b..6d40543 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)
@@ -683,15 +683,6 @@ static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
 	nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base),
 			  E_ECAM_BASE_HI);
 
-	/* Get bus range */
-	ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL);
-	pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT;
-	/* Write primary, secondary and subordinate bus numbers */
-	ecam_val = first_busno;
-	ecam_val |= (first_busno + 1) << 8;
-	ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT);
-	writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS));
-
 	if (nwl_pcie_link_up(pcie))
 		dev_info(dev, "Link is UP\n");
 	else
-- 
1.8.3.1