PCI: apple: Fix PERST# polarity

Now that PERST# is properly defined as active-low in the device tree, fix
the driver to correctly drive the line independently of the implied
polarity.

Suggested-by: Pali Rohár <[email protected]>
Fixes: 1e33888 ("PCI: apple: Add initial hardware bring-up")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Luca Ceresoli <[email protected]>

Author: Marc Zyngier

drivers/pci/controller/pcie-apple.c

@@ -540,7 +540,7 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
 	rmw_set(PORT_APPCLK_EN, port->base + PORT_APPCLK);
 
 	/* Assert PERST# before setting up the clock */
-	gpiod_set_value(reset, 0);
+	gpiod_set_value(reset, 1);
 
 	ret = apple_pcie_setup_refclk(pcie, port);
 	if (ret < 0)
@@ -551,7 +551,7 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
 
 	/* Deassert PERST# */
 	rmw_set(PORT_PERST_OFF, port->base + PORT_PERST);
-	gpiod_set_value(reset, 1);
+	gpiod_set_value(reset, 0);
 
 	/* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */
 	msleep(100);