diff mbox series

[v6,4/5] PCI: brcmstb: Assert PERST# on BCM2711

Message ID 20230623144100.34196-5-james.quinlan@broadcom.com (mailing list archive)
State New, archived
Headers show
Series PCI: brcmstb: Configure appropriate HW CLKREQ# mode | expand

Commit Message

Jim Quinlan June 23, 2023, 2:40 p.m. UTC 
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(+)
diff mbox series

Patch

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 */