58 lines
1.8 KiB
Diff
58 lines
1.8 KiB
Diff
From 23ef7f759a9778402eeeb95924eb300cb1f88bd2 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Tue, 10 Mar 2020 13:52:41 +0100
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Subject: [PATCH] PCI: brcmstb: Wait for Raspberry Pi's firmware when present
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xHCI's PCI fixup, run at the end of pcie-brcmstb's probe, depends on
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RPi4's VideoCore firmware interface to be up and running. It's possible
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for both initializations to race, so make sure it's available prior to
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starting.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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---
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drivers/pci/controller/pcie-brcmstb.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
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index 6d79d14527a6..aee84679a997 100644
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--- a/drivers/pci/controller/pcie-brcmstb.c
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+++ b/drivers/pci/controller/pcie-brcmstb.c
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@@ -28,6 +28,8 @@
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#include <linux/string.h>
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#include <linux/types.h>
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+#include <soc/bcm2835/raspberrypi-firmware.h>
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+
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#include "../pci.h"
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/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
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@@ -917,11 +919,24 @@ static int brcm_pcie_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node, *msi_np;
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struct pci_host_bridge *bridge;
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+ struct device_node *fw_np;
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struct brcm_pcie *pcie;
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struct pci_bus *child;
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struct resource *res;
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int ret;
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+ /*
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+ * We have to wait for the Raspberry Pi's firmware interface to be up
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+ * as some PCI fixups depend on it.
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+ */
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+ fw_np = of_find_compatible_node(NULL, NULL,
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+ "raspberrypi,bcm2835-firmware");
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+ if (fw_np && !rpi_firmware_get(fw_np)) {
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+ of_node_put(fw_np);
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+ return -EPROBE_DEFER;
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+ }
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+ of_node_put(fw_np);
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+
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bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
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if (!bridge)
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return -ENOMEM;
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--
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2.26.2
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