PCI: mediatek-gen3: Move controller setup steps before PERST# control

Setting up the translation windows and enabling MSI involve only the
controller, not the link or any downstream device. These can be done before
the device is enabled.

Move these steps before the existing PERST# control and waiting for the
link to come up. This provides a cleaner separation of controller vs device
setup. This also allows the later commits that split out PERST# control and
add device power control to have cleaner teardown.

This change only moves code. No functional change is expected.

Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260324052002.4072430-4-wenst@chromium.org

Author: wens

drivers/pci/controller/pcie-mediatek-gen3.c

@@ -464,6 +464,31 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
 	val |= PCIE_DISABLE_DVFSRC_VLT_REQ;
 	writel_relaxed(val, pcie->base + PCIE_MISC_CTRL_REG);
 
+	mtk_pcie_enable_msi(pcie);
+
+	/* Set PCIe translation windows */
+	resource_list_for_each_entry(entry, &host->windows) {
+		struct resource *res = entry->res;
+		unsigned long type = resource_type(res);
+		resource_size_t cpu_addr;
+		resource_size_t pci_addr;
+		resource_size_t size;
+
+		if (type == IORESOURCE_IO)
+			cpu_addr = pci_pio_to_address(res->start);
+		else if (type == IORESOURCE_MEM)
+			cpu_addr = res->start;
+		else
+			continue;
+
+		pci_addr = res->start - entry->offset;
+		size = resource_size(res);
+		err = mtk_pcie_set_trans_table(pcie, cpu_addr, pci_addr, size,
+					       type, &table_index);
+		if (err)
+			return err;
+	}
+
 	/*
 	 * Airoha EN7581 has a hw bug asserting/releasing PCIE_PE_RSTB signal
 	 * causing occasional PCIe link down. In order to overcome the issue,
@@ -510,31 +535,6 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
 		return err;
 	}
 
-	mtk_pcie_enable_msi(pcie);
-
-	/* Set PCIe translation windows */
-	resource_list_for_each_entry(entry, &host->windows) {
-		struct resource *res = entry->res;
-		unsigned long type = resource_type(res);
-		resource_size_t cpu_addr;
-		resource_size_t pci_addr;
-		resource_size_t size;
-
-		if (type == IORESOURCE_IO)
-			cpu_addr = pci_pio_to_address(res->start);
-		else if (type == IORESOURCE_MEM)
-			cpu_addr = res->start;
-		else
-			continue;
-
-		pci_addr = res->start - entry->offset;
-		size = resource_size(res);
-		err = mtk_pcie_set_trans_table(pcie, cpu_addr, pci_addr, size,
-					       type, &table_index);
-		if (err)
-			return err;
-	}
-
 	return 0;
 }