2022-04-22 15:00:47 +00:00
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From 1deae19d485f6585b11ea2d2b5dad7c40fa124ef Mon Sep 17 00:00:00 2001
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2021-11-24 17:32:01 +00:00
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 11 Nov 2020 17:08:33 +0000
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2022-04-22 15:00:47 +00:00
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Subject: [PATCH 318/828] PCI: brcmstb: Restore initial fundamental reset
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2021-11-24 17:32:01 +00:00
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[1] replaced a single reset function with a pointer to one of two
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implementations, but also removed the call asserting the reset
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at the start of brcm_pcie_setup. Doing so breaks Raspberry Pis with
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VL805 XHCI controllers lacking dedicated SPI EEPROMs, which have been
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used for USB booting but then need to be reset so that the kernel
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can reconfigure them. The lack of a reset causes the firmware's loading
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of the EEPROM image to RAM to fail, breaking USB for the kernel.
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See: https://www.raspberrypi.org/forums/viewtopic.php?p=1758157#p1758157
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Fixes: 04356ac30771 ("PCI: brcmstb: Add bcm7278 PERST# support")
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[1] 04356ac30771 ("PCI: brcmstb: Add bcm7278 PERST# support")
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/pci/controller/pcie-brcmstb.c | 2 ++
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1 file changed, 2 insertions(+)
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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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2022-04-22 15:00:47 +00:00
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@@ -879,6 +879,8 @@ static int brcm_pcie_setup(struct brcm_p
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2021-11-24 17:32:01 +00:00
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/* Reset the bridge */
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pcie->bridge_sw_init_set(pcie, 1);
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+ pcie->perst_set(pcie, 1);
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+
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usleep_range(100, 200);
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/* Take the bridge out of reset */
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