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PCI: brcmstb: Assert PERST# on BCM2711

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The current PCIe driver assumes PERST# is asserted when probe() is invoked.
Some older versions of the 2711/RPi bootloader left PERST# unasserted, as
the Raspian OS does assert PERST# on probe().  For this reason, we assert
PERST# for BCM2711 SOCs (i.e. RPi).

Link: https://lore.kernel.org/r/20230623144100.34196-5-james.quinlan@broadcom.com
Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
This commit is contained in:
Jim Quinlan 2023-06-23 10:40:57 -04:00 committed by Lorenzo Pieralisi
parent 06c2afb862
commit 8eb8c27353
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/controller/pcie-brcmstb.c
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@ -874,6 +874,11 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
/* Reset the bridge */
pcie->bridge_sw_init_set(pcie, 1);
/* Ensure that PERST# is asserted; some bootloaders may deassert it. */
if (pcie->type == BCM2711)
pcie->perst_set(pcie, 1);
usleep_range(100, 200);
/* Take the bridge out of reset */