Revert "PCI: armada8k: Add support for gpio controlled reset signal"

baruchsiach · bjorn-helgaas · commit f14bcc0add3a · 2019-01-31T15:07:29.000-06:00
Revert commit 3d71746 ("PCI: armada8k: Add support for gpio controlled reset signal"). That commit breaks boot on Macchiatobin board when a Mellanox NIC is present in the PCIe slot. It turns out that full reset cycle requires first comphy serdes initialization. Reset signal toggle without comphy initialization makes access to PCI configuration registers stall indefinitely. U-Boot toggles the Macchiatobin PCIe reset line already at boot, after initializing the comphy serdes. So while commit 3d71746 ("PCI: armada8k: Add support for gpio controlled reset signal") enables PCIe on platforms that U-Boot does not touch the reset line (like Clearfog GT-8K), it breaks PCIe (and boot) on the Macchiatobin board. Revert commit 3d71746 ("PCI: armada8k: Add support for gpio controlled reset signal") entirely to fix the Macchiatobin regression. Reported-by: Sven Auhagen <sven.auhagen@voleatech.de> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
diff --git a/drivers/pci/controller/dwc/pcie-armada8k.c b/drivers/pci/controller/dwc/pcie-armada8k.c
@@ -22,15 +22,13 @@
 #include <linux/resource.h>
 #include <linux/of_pci.h>
 #include <linux/of_irq.h>
-#include <linux/gpio/consumer.h>
 
 #include "pcie-designware.h"
 
 struct armada8k_pcie {
 	struct dw_pcie *pci;
 	struct clk *clk;
 	struct clk *clk_reg;
-	struct gpio_desc *reset_gpio;
 };
 
 #define PCIE_VENDOR_REGS_OFFSET		0x8000
@@ -139,12 +137,6 @@ static int armada8k_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct armada8k_pcie *pcie = to_armada8k_pcie(pci);
 
-	if (pcie->reset_gpio) {
-		/* assert and then deassert the reset signal */
-		gpiod_set_value_cansleep(pcie->reset_gpio, 1);
-		msleep(100);
-		gpiod_set_value_cansleep(pcie->reset_gpio, 0);
-	}
 	dw_pcie_setup_rc(pp);
 	armada8k_pcie_establish_link(pcie);
 
@@ -257,14 +249,6 @@ static int armada8k_pcie_probe(struct platform_device *pdev)
 		goto fail_clkreg;
 	}
 
-	/* Get reset gpio signal and hold asserted (logically high) */
-	pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset",
-						   GPIOD_OUT_HIGH);
-	if (IS_ERR(pcie->reset_gpio)) {
-		ret = PTR_ERR(pcie->reset_gpio);
-		goto fail_clkreg;
-	}
-
 	platform_set_drvdata(pdev, pcie);
 
 	ret = armada8k_add_pcie_port(pcie, pdev);
