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

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Revert commit 3d71746c42 ("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 3d71746c42 ("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 3d71746c42 ("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>
This commit is contained in:
Baruch Siach 2019-01-31 15:00:18 -06:00 committed by Bjorn Helgaas
parent 432dd7064a
commit f14bcc0add
1 changed files with 0 additions and 16 deletions
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16
drivers/pci/controller/dwc/pcie-armada8k.c
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@ -22,7 +22,6 @@
#include <linux/resource.h>
#include <linux/of_pci.h>
#include <linux/of_irq.h>
#include <linux/gpio/consumer.h>
#include "pcie-designware.h"
@ -30,7 +29,6 @@ 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);