| Message ID | 20230623144100.34196-5-james.quinlan@broadcom.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | PCI: brcmstb: Configure appropriate HW CLKREQ# mode | expand |
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index fe0415a98c63..7b698a9a851e 100644 --- a/drivers/pci/controller/pcie-brcmstb.c +++ b/drivers/pci/controller/pcie-brcmstb.c @@ -884,6 +884,11 @@ 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 */
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). Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com> --- drivers/pci/controller/pcie-brcmstb.c | 5 +++++ 1 file changed, 5 insertions(+)