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>
/* 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 */